Shimano / Nexus INTER-8

There are so many informations about the Shimano Nexus INTER-8 hubs, that the page is splitted into two parts. We´ll start with generall informations which belong to all the INTER-8 internally geared hubs. In the second part the informations are listed under the Roller Brake (SG-8R…) or Coaster Brake (SG-8C…) gear hub model.

General:

Reviews / Announcements:

Maintenance / Installation Documents:

Drawings / Spareparts:

  • SB-8S20 (February 2003, english, Revo Shifter – Brake Lever Combination)
  • SB-8S20 (February 2003, german, Revo Shifter – Brake Lever Combination)
  • SL-8S20 (June 2004, english, Revo Shifter)
  • SL-8S20 (June 2004, german, Revo Shifter)
  • SL-8S20 (August 2006, english, Revo Shifter)
  • ST-8S20 (May 2003, english, Tap-Fire Lever)

Pictures:

There are two groups of Nexus INTER-8 internally geared hubs:

  • With Roller Brake Option (SG-8R20, SG-8R22, SG-8R25, SG-8R27, SG-8R30 and SG-8R35. These can also be used for V-Brake purpose)
  • With Coaster Brake (SG-8C20 and SG-8C22)

Nexus INTER-8 intern hubs with Roller Brake Option:

Options:

  • Cesur Bikes offers a adapter kit for the INTER-8 SG-8R… (Rollerbrake Option) to mount a disc brake. A movie shows the mounting procedure (Also available for Shimano INTER-3, INTER-4 and INTER-7)

  • Cesur Bikes offers a LED light for the INTER-8 turning shifter. The power for the LED is generated by the necessary hub dynamo. If bicycle lights with a “stand light function” (condensator) are used the shifter LED light also shines during stand the stand still of the wheels!

  • Here is a picture of Bob Carter´s oil bath running Nexus hub.

Maintenance / Installation Documents:

Drawings / Spareparts:

  • SG-8R20 (February 2004, german, axel length: 184mm)
  • SG-8R20 (January 2005, german, Differences to February 2004 SG8R20: new axel length 203mm with cover nut for 203mm and 3,2mm washer, Ring Gear Unit seperate order number Part 43. When the inner gear unit Part 1 is defect you can save the axel and save money! There must have been some complains from bicycle dealers to offer a more specific spare part.)
  • SG-8R20 (January 2005, german, axel length: 193mm, Riemenantrieb)
  • SG-8R20 (July 2006, english, Differences to February 2004 SG8R20: new axel length 203mm with cover nut for 203mm and 3,2mm washer, Ring Gear Unit seperate order number Part 43. When the inner gear unit Part 1 is defect you can save the axel and save money! There must have been some complains from bicycle dealers to offer a more specific spare part.)
  • SG-8R20 (September 2006, english, axel length: 193mm, Belt Drive)
  • SG-8R22 (March 2007, english, Differences to SG-8R20: Right Hand Dust Caps Parts 30, 44. Improved Sealing!)
  • SG-8R25 (February 2004, german)
  • SG-8R25 (January 2005, german, Differences to February 2004 SG8R25: Ring Gear Unit seperate order number Part 44. When the inner gear unit Part 1 is defect you can save the axel and save money! There must have been some complains from bicycle dealers to offer a more specific spare part.)
  • SG-8R25 (September 2006, english, Differences to February 2004 SG-8R25: Ring Gear Unit seperate order number Part 44. When the inner gear unit Part 1 is defect you can save the axel and money! There must have been some complains from bicycle dealers to offer a more specific spare part.)
  • SG-8R27 (March 2007, english, Differences to January 2005, german and September 2006, english SG-8R25: Right Hand Dust Caps Parts 31, 44. Improved Sealing!)
  • SG-8R30 (August 2007, english, Interchangeability Overview between SG-8R20, SG-8R22, SG-8R30, SG-8R35, SG-8C20 and SG-8C22. Also details about the applicable Sprockets in Combination with the new Dust Caps)
  • SG-8R35 (August 2007, english, Interchangeability Overview between SG-8R25, SG-8R27 and SG-8R30. Also details about the applicable Sprockets in Combination with the new Dust Caps)
  • WH-8R25 (September 2006, english, Nexus Rear Wheel with SG-8R25 internal gear hub)

Pictures:

Nexus INTER-8 intern hubs with Coaster Brake Option:

Maintenance / Installation Documents:

Drawing / Spareparts:

  • SG-8C20 (December 2004, german)
  • SG-8C20 (July 2006, english)
  • SG-8C22 (March 2007, english, Differences to SG-8C20: Right Hand Dust Caps Parts 26, 42. Improved Sealing!)

Pictures:

72 Replies

  1. mimi

    January 23, 2008 at 12:43 am

    does anyone know if it’s possible to combine nexus parts to construct a nexus 8 with redband needle bearings and a coaster brake?

    Reply
  2. Stephen

    April 11, 2008 at 5:33 pm

    Yes, I would like to know if a redband, needle bearing hub can be built with a coaster brake.

    Reply
  3. Marco

    April 13, 2008 at 8:44 pm

    Stephen,

    I have no personal experiance. I checked the ordernumbers of the different hubs (the inner gear unit). These numbers are different! Also check these link for interchangeability details:

    http://www.hubstripping.com/shimano-inter8/tech/SG-8R30-2727A.pdf

    The inner gear units with the needle bearings is not signed as compatible!

    Gruß,

    Marco

    Reply
  4. Saju Daniel

    April 24, 2008 at 11:31 am

    Can you please tell me the difference between 8R25,8R27,8R30 and 8R35.I do commute a lot.So which is more recommended and offers better value for money?
    some of them havent even showed up on other Shimano Websites?
    Does that mean that they are the latest models ?

    thanks,

    Saju Daniel

    Reply
  5. David

    May 16, 2008 at 10:48 pm

    Biomega Website

    Whilst looking at the Biomega site I noticed that the Amsterdam bike featured with the Shimano 8 speed hub has a different design of turning shifter that I’ve never seen before:

    http://www.biomega.dk/PictureViewer.aspx?imageid=259&gid=272

    Is this a new design or something that has been available for some time?

    Reply
  6. Marco

    May 18, 2008 at 8:38 pm

    David,

    the Amsterdam shows a SRAM 7-speed hub and shifter.

    Gruß,

    Marco

    Reply
  7. Nick Hunter

    June 22, 2008 at 6:47 pm

    Would like to know what to do for everyday maintenance for my Shimano Nexus hub gear. I’m just an everyday cyclist.Also, how do I unhitch gears when removing rear wheel?
    Would be grateful for info. Thank you

    Reply
  8. Marcello

    June 30, 2008 at 9:17 pm

    NEXUS 8 SG 8R30 – CHIEDO CORTESEMENTE UN CONSIGLIO – QUANDO PEDALO SUCCEDE CHE L’INGRANAGGIO DEL MOZZO NON INGRANA BENE, CIO’ CAPITA SPESSA ED E’ MOLTO FASTIDIOSO.
    C’E’ UNA SOLUZIONE ? GRAZIE

    MARCELLO

    Reply
  9. dick britton

    July 7, 2008 at 6:00 pm

    Can I buy an 8 speed system that will replace a 3 speed system on an old sears trike, factory direct? How much? If not factory direct where is the nearest distributer/dealer to Portland? What is the suggested retail price?

    Reply
  10. Fernando

    July 10, 2008 at 9:32 am

    hello, I’m from spain and this type of hub is extremely rare in my country and no shimano’s tech service here. I need help with my nexus 8sp hub (sg8R25), in the manual draws this is the assembled piece -Hub Axle Unit (Axle Length 184 mm) 8 Y-36W 98040- but I need any instruction, or picture, or diagram, for the internal wharfs into this piece (my hub was “diving” and was full of corrosion, I disassembled, but don’t drew this disassebly part)
    If somebody can help me, I’ll been very thankful

    If anybody can hel me, I´ll need a good online store where to buy a same hub. thank you.

    Reply
  11. RS

    July 26, 2008 at 10:24 pm

    I’ve looked extensively for a total brake down
    of the nexus 8. I have yet to find the Hub Axle Unit assembly
    instructions? there are 2 coil springs and other pieces that I’m
    stuck guessing how they go back together. Any help would
    be appreciated i555007 AT yahoo.com

    Reply
  12. rudolfganz

    July 28, 2008 at 10:13 am

    Sehr nutzbar dein Blog!
    Danke vielmals.

    Individuals like you make the Universe enjoyful, sharing wisdom.

    Reply
  13. RS

    July 28, 2008 at 9:43 pm

    Fernando

    If you still need help email me, I’ve figured it out after two days of messing with it. it’s very tricky, but I took pics of each step.

    Reply
  14. Fernando

    July 29, 2008 at 9:02 am

    RS

    thank you, RS. My problem is the same, my email “ffparrales@gruposolucion.es”. thanks.

    Reply
  15. Steve Weeks

    August 27, 2008 at 8:55 pm

    Does anyone know what the “Maintenance Oil” used on the Nexus 8-speed is? Is it an actual lubricant, or is it a solvent to remove the grease?
    Thanks!
    Steve

    Reply
  16. Reid

    September 15, 2008 at 8:37 am

    Marco,

    Can I use a smaller front gear (like 32T instead of 44T) with a Nexus 8, or will this exceed the acceptable input torque of the gearhub? Does Shimano publish the acceptable input torque?

    Thanks,

    -R

    Reply
  17. Rich Wood

    October 19, 2008 at 3:29 am

    Reid;

    I have the same general question. I note that Rohloff and Sram have published limits for their hubs input ratios. Sram’s vary from 1.73 to 1 upto 2.0 to 1 depending on hub model. Rohloff lists a limit of between 2.35 and 2.50 to 1 depending on application and/or rider weight.

    Even older, pre Sunrace, Sturmey Archer enginering data I found shows a input ratio limit of >2.0 to 1 for the two hubs I have found data for.

    No published data has been found for either Shimano or current Sunrace Sturmey Archer hubs. Interesting that the western owned companies provide the information but the far eastern owned ones do not.

    Reply
  18. sam

    November 2, 2008 at 6:59 pm

    is the non-drive “end” of the hub shell replaceable? By that, I mean the splined part that attaches the brake system, which holds the left-sid bearings. My customer rode his wheel loose (while attached to an Xtracycle, with two children ages 5 and 8 riding on it, every day, for two years), and now this part of the hub shell has little cracks going all the way through from the bearing surface to the splines. It looks to me like this “part” might be removable from the hub shell itself, and that a new one could be pressed in. Can anyone confirm or deny this? And, what is the appropriate solution for my customer, other than getting a new wheel?

    Reply
  19. Steve Weeks

    November 3, 2008 at 4:19 am

    @ Sam:
    As far as I know, the splined non-drive end of the hub is not available as a separate piece. The “exploded-view” PDF on the Shimano web site does not show the hub shell as being separable into components. The splined coupler appears as if it is made of a different metal than the rest of the shell; it may be pressed in, but still doesn’t seem to be replaceable.

    Other than replacing the whole hub (the most expedient option), you could look for another Nexus hub with a damaged set of gears. You could swap innards. However, there is as you know a bearing race just inboard of the splined coupler, which must be in good shape.

    I’d recommend a new hub or a replacement wheel. This might seem like bad news for the customer, but who rode the wheel loose?
    Steve

    Reply
  20. Kai Duncan

    November 16, 2008 at 2:36 am

    I have just brought a bike from WWW. EdinburghBicycle.com . Web ref 9452 .Its a Revolution Courier Nexus it has the SG-8R30 hub so far i have ridden 235KM on it with no problems (20t rear sprocket 44t chainring)

    Reply
  21. antonis

    December 6, 2008 at 11:39 am

    hello
    i like to buy a shimano nexus 8 internal speed that model that weighs 1550 gram.
    how much does it cost?

    Reply
  22. Charles

    December 15, 2008 at 8:03 pm

    I’m having a Nexus8 problem and can’t seem to find info. Any advice would be appreciated.

    The hub is only about 2 months old. The other day I shifted from gear 5 to 4, then stood up to accelerate before the shift was complete. It missed and ground and made all sorts of nasty noises, then it hasn’t worked right since. It skips and pops in all gears, and it’s basically unrideable. Cable alignment is good, so that’s not the problem. Something seems to be the matter internally.

    So, I followed the directions on the Sheldon Brown site for disassembly. I don’t have the special $50 shimano tool, so I couldn’t get it entirely apart, but there were no visible problems with the parts I could see. All of the gears looked good as new. I reassembled and the problem has persisted.

    Anyone experience something similar? Can internal parts be bought separately and installed? If so, can anyone point me to a resource? I’m loathe to unlace the wheel and try to make a warranty claim. If I can get hold of some replacement parts for <$50 or so, that’d be the ideal route.

    Thanks in advance for any help.

    Reply
  23. Darren Hague

    January 16, 2009 at 2:21 am

    Hi there,

    I’m about to buy a new commuter bike (Giant Expression) which only comes in Nexus-3 and Nexus-7 variants – I would really like it with a Nexus-8-Premium. My plan is to buy the Nexus-3 variant (much cheaper than the N7) and then upgrade the hub. As far as I can tell, all I should need to replace is the hub, roller brake and shifter. There’s also a chance that the spokes may need replacing. Any thoughts?

    Cheers,
    Darren

    Reply
  24. Steve Weeks

    January 16, 2009 at 7:04 pm

    @ Darren Hague
    The Nexus-7 is a decent hub. If I were you, I’d get that one and ride it until you need a new hub. If you change the hub, you will also need a new gear changer.
    Steve

    Reply
  25. Darren Hague

    January 24, 2009 at 1:39 am

    @Steve Weeks Thanks for the advice – that’s exactly what I have done. The Nexus-3 route was just too complicated – it’s a different width, different roller-brake, etc. The Nexus-7 is much easier to upgrade to a Nexus-8, but as you suggest I will wait until the Nexus-7 wears out first.

    Cheers,
    Darren

    Reply
  26. Steve Weeks

    January 24, 2009 at 4:37 am

    @ Darren Hague
    Glad it worked out!
    Steve

    Reply
  27. Steve Weeks

    January 24, 2009 at 4:41 am

    Afterthought, Darren:
    Not to be thick, but how did you put your image in the avatar?
    Steve

    Reply
  28. dhague

    January 24, 2009 at 2:10 pm

    @Steve – I use Gravatar.com. Just create an account there, upload an image and associate it with your email address. This website checks the email address you enter against Gravatar, and uses the image from there automatically.

    Cheers,
    Darren

    Reply
  29. Evan

    February 6, 2009 at 10:27 pm

    About the Cesur Bikes Adapter, I only read english and would like to know how much and where to get one. Any beta?

    Thank yOu,
    Evan

    Reply
  30. Steve Weeks

    February 8, 2009 at 2:41 am

    Thanks, Darren!
    Steve

    Reply
  31. Evan

    February 24, 2009 at 11:08 pm

    Hi all, it is high time to overhaul my nexus hub(s) and I am wondering if it may be possible to somehow rebuild with a quick release axle? This would be nice for my mountain bike, which has vertical dropouts, using an elliptical bottom bracket for chain tension. Also, where can I buy the tools and lubes for this hub?

    Reply
    • Lucy

      July 29, 2009 at 8:29 pm

      Evan, did you get an answer or solution to your quick release question? I want to attach a child trailer to my nexus 8 and it would be much simpler to swap between bikes if there were a quick release. So any thoughts?

      Reply
  32. Mike Kilpatrick

    February 28, 2009 at 1:52 pm

    Hi Guys
    I was fortunate enough to get a premium brand Nexus 8 Hub from the WH-8R25 Wheel assembly(24 hole)
    I have sourced a 24 hole rim DT Swiss RR1.2 (ERD 582mm)
    None drive side has been laced radial and not sure about the drive side,the Shimano Tech Doc does list spoke lengths but without knowing the ERD of the Shimano rim this information is useless.
    Has anyone rebuilt one of these wheel assemblies with a DT Swiss rim, and got any spoke sizes or any other information.
    Ordinarily there would be no problem just using a normal spoke calculator but the hub has the holes spaced with pairs close together seperated by a rather large gap.
    Thanks for any info it would be appreciated.
    Mike

    Reply
  33. leonwoodbine

    March 2, 2009 at 12:16 am

    Hi Mike K,
    To do spoke length for paired lacing, (like on the Shimano Nexus wheel you have) just measure the flange diameter/OLD/center to flange as normal, and use a spoke calculator that calculates the length for paired spokes (the effective length changes from conventional crossed lacing). The DT rim ERD is easy to find, it is printed on the sticker of the rim and on the website. Try spocalc for the calculation for paired spokes – it is easy and clear. Hope this helps, happy building.

    Reply
  34. leonwoodbine

    March 2, 2009 at 12:17 am

    Here’s the website for spocalc:
    http://www.sheldonbrown.com/rinard/spocalc.htm

    Reply
  35. Mike Kilpatrick

    March 2, 2009 at 9:14 am

    Hi Leon
    Thanks for your reply.
    I was unaware there was a calculator that would cope with paired spokes.the hole spacing for the pairs on the hub flange is 8mm and this gives an included angle for the pairs of 11deg the holes in the rim are pitched at 30deg(none drive side and radially spoked) The DT Swiss calculator just looks like the normal equal spaced holes in flange and rim.Trying a bit of trig at the moment but a bit rusty.
    Any further comments appreciated.
    Regards
    Mike

    Reply
  36. Mike Kilpatrick

    March 2, 2009 at 9:30 am

    Leon
    Thanks for that link,have just downloaded it will check it out later(got some sand coming) and let you know how i got on.
    Regards
    Mike

    Reply
  37. Peter

    March 16, 2009 at 3:28 pm

    Hi,

    Do you know if it is possible to completely disable the coaster brake on a Nexus 7 hub, and if so, how?

    My wife has one on her town bike and she loathes the coaster brake — it makes it hard to return pedals to a suitable position for setting off, and she also finds herself engaging the brake accidentally.

    Thanks,
    Peter

    Reply
  38. ZebraUno

    March 19, 2009 at 11:50 am

    @Peter: Yes, it’s possibile to disable the coaster brake. I had a Nexus 7 and did it without any hint. You have to remove the left cup (that with the brake arm) and carefully extract the brake drum. It consists in two metal half rings, covered with grease (don’t remove it).
    It worked nice for me.

    Reply
  39. ZebraUno

    March 19, 2009 at 11:55 am

    About the Nexus 8 disc adapter from cesur.de….
    I sent a couple of emails (in english and german) to the address showed in the Contact page, and never received an answer.

    I also translated the sit in order to buy the adapter directly from the online store. The bank transfer was made 10 days ago and I’m still waiting for any kind of reply (except the automated one, when you send the buy order).

    The article was re-added to the items in stock for sale just at the end of February 2009, so I guess there must be some one left!

    note: I ordered the item to Italy, inside the EU.

    Reply
  40. Zebrauno

    March 25, 2009 at 1:37 pm

    Cesur.de doesn’t answers to any email.
    Payment sent on 7 March 2009 for a Nexus 8 disc adapter and until now, 25 March 2009, I received no reply at all.

    You should remove the links to the website because there is no way to contact them, they doesn’t reply but received the money via bank transfer.

    This is great shit.

    Reply
  41. Marco

    March 25, 2009 at 10:48 pm

    Hello ZebraUno,

    the Cesur blog shows activity.

    http://www.cesur.de/assets/s2dmain.htmlhttp://www.cesur.de/

    Here are the contact informations which I found on the homepage:

    Cesur – Entwicklung und Vertrieb
    Cengiz Cesur
    Friedrich-Ebert-Str. 123
    48153 Münster

    Telefon: 0251 / 7479953
    Telefax: 03212 / 1051528

    E-Mail: shopfahrrad@gmx.de
    http://www.cesur.de

    I hope I could support you.

    Gruß,

    Marco

    Reply
  42. Zebrauno

    March 27, 2009 at 5:33 pm

    Thanks Marco, I sent almost 4 emails to the same address you posted, without any kind of reply.
    On Flickr there’s a profile naed Cesur.de….I sent messages also there, without a bit of consideration.

    I’m not going to lose my money that way….the blog activity could be totally fake, from my p.o.v.

    Reply
  43. Zebrauno

    April 29, 2009 at 11:59 am

    A full month is gone after I posted here. I received replies from http://www.cesur.de and they told me that the material I payed for was in transit 14 days ago, without giving me the traking number of the claimed shipping. After that they just stopped any reply and I received NOTHING.

    Marco, you should remove the links to cesur.de. They act in a fraudly way and I first knew about their Nexus Disc adapter from your your site…
    If I didn’t saw the link here now I’ll still have the money in my pocket.

    I’m just giving them the feedback they deserve.

    Reply
    • Marco

      April 30, 2009 at 9:54 pm

      Hi Zebrauno,

      I understand your anger in this case. But please understand that I cannot take over the responsibility for the products and the service of the companies hubstripping.com links to. To be as transperant as possible your comment will advice future possible customers.

      Have fun cycling!

      Marco

      Reply
      • Zebrauno

        May 4, 2009 at 5:44 pm

        Hi Marco, today I finally received the loooooong awaited items.

        If you want you can remove my posts, but the communications and timings were terrible.

        I suggest to take the items directly from the real store, if you can.

  44. johninstockie

    May 14, 2009 at 7:58 pm

    Hi Guys

    I am struggling to get ahold of Shimano 24 spoke rims for a wheel rebuild on my commuter bike (the others are too thin for my 40mm tyres).

    Do you know if its possible to order only a 32 or 36 spoke Nexus Inter-8 outer casing only, and then swap the internals completely over?

    Thanks for any help

    John

    Reply
  45. chris

    July 6, 2009 at 5:18 am

    I am looking for the Shimano Nexus 7 RapidFire Shifter. I can’t find it anywhere. Is there another thumb shifter that will work for my Shiman Nexus 7 speed hub?
    Thanks,
    Chris

    Reply
  46. Daus

    July 17, 2009 at 4:25 pm

    Hi,

    I have a Shimano Nexus 8 Red Band Hub on my bicycle. Unfortunately, I have been having an issue with vibration at higher speeds while riding. I put the bike on the bike stand and turned the cranks on the 8th gear at turned them fast and that is when the vibration starts up. It is very noticable. There is no play on the wheel side to side. I even removed the tire, checked that the spokes are tight, and the vibration still seems to be coming straight from the hub. It happens more when the cranks are turning and following to keep up the rear wheel turning. When the wheel is allows to coast, the vibration goes down. Any idead as to why this is the case?

    Reply
  47. Rich Wood

    August 6, 2009 at 12:30 am

    The Shimano America web site has a lot of IGH information available in their Tech Tips area. Checking of the Shimano Europe and Shimano Australia sites has not turned up the same English language information. Available info includes disassembly/assembly info PDFs for most hubs as well as many other tech documents. Here is the link:

    http://bike.shimano.com/publish/content/global_cycle/en/us/index/tech_support/tech_tips.html

    Click on my name at the top of this post to visit the “Geared Hub Bikes Yahoo group which now has 150+ members. Lots of links and info available to members for all makes of geared hubs.

    Reply
  48. Ben

    September 1, 2009 at 11:38 pm

    Folks, I’d like to equip my recumbent 20″ wheel with a Nexus 8 gear premium and roller brake that I currently use in a 26″ wheel on another bike. By mistake, I bought a 20″ wheel with a Nexus 8 gear COSTER brake which is pretty useless on the recumbent. I’d like to know whether I could just remove the coster stuff from its housing on the 20″ wheel and fill in the premium stuff removed from the housing fit on the 26″ wheel, where I would then fill the coster stuff. So is it possible to exchange the housing of the various Nexus 8 gear brake types? Any answer will be much appreciated.
    Ben.

    Reply
  49. Ian40766

    September 8, 2009 at 12:04 am

    Hi,

    thank-you for the help,

    I’ve been looking for this information for ages!

    Excellent pictures,

    I will definitely fix my bike this week!

    -Ian

    Reply
  50. oar8

    September 12, 2009 at 5:55 am

    I got a SG-8R20 off eBay and built a wheel from it. It would make a grinding noise in 4, 5 gear while under load but runs fine down shifting from 8 to 7 to 6.. etc.
    Is this related to needing lubrication or this hub is worn out?
    Here it is on a training stand:
    http://i48.photobucket.com/albums/f228/oar8/Bikes/DSCN0123.jpg

    Reply
  51. mark

    October 4, 2009 at 12:50 am

    Hi anyone know if i could use my NOS shimano nexus inter- 4 speed with coaster brake as a freewheel? that is could i remove the coaster parts and use it safely?
    thanks

    Reply
  52. Daniel

    October 4, 2009 at 5:42 pm

    My new (May 2009) r-m Delite city bike has an SG-8R25 igh – works fine! BUT: Sometimes, I notice slippage between gears without me having worked the shifter… :-( It’s usually between the lower gears 2-4, and not in the higher gears (say, 6-8). Has anyone else noticed this? I have gone through and adjusted the two yellow marks in the tiny window thingy, so I think I’ve correctly adjusted eveyrthign that can be – but after just a few kilometres, the slippage starts again. Oh, and i also have to re-adjust the two yellow marks.

    Any hints?

    THANKS!

    – Daniel, Darmstadt, Germany

    Reply
  53. Daniel

    October 4, 2009 at 5:44 pm

    My new (May 2009) r-m Delite city bike has an SG-8R25 igh – works fine! BUT: Sometimes, I notice slippage between gears without me having worked the shifter… :-( It’s usually between the lower gears 2-4, and not in the higher gears (say, 6-8). Has anyone else noticed this? I have gone through and adjusted the two yellow marks in the tiny window thingy, so I think I’ve correctly adjusted everything that can be – but after just a few kilometres, the slippage starts again. Oh, and i also have to re-adjust the two yellow marks.

    Any hints?

    THANKS!

    – Daniel, Darmstadt, Germany

    Reply
  54. Mike Kilpatrick

    October 5, 2009 at 8:12 am

    @ Daniel
    Could be wrong but it sounds like the nut that is on the end of the cable that locates in the cassete joint is slipping, check the the length from end of cable to centre of nut (spec is on the site)
    Hope that helps
    Mike

    Reply
  55. GLNC

    October 5, 2009 at 10:58 pm

    On conversion of older bikes to hubs:
    A possible way to fit 7-8 gear hubs in frames made for older 3-speed hubs and single speed chains with too narrow forks was revealed on a recently acquired bike: mount the hub between the outside surfaces of the fork using a mending plate bolted to the fork and drilled for the axle (as well as for any non-turn washers), possibly drilling holes in the fork for the plate (substantial bolt size is required for the load, but must not take out too much fork material). Another 6mm on each side can be had depending on fork material. Can be done on one side only as well, with adjustment of the wheel build dishing. There is often a locknut on the ends of the hub shaft which will fit between the forks etc. There can still be room for the ring type shifter inside the forks. Details are left to the expert mechanics — just a possibility.

    Reply
  56. Kaba

    October 18, 2009 at 6:14 am

    While out riding my gear ratios changed from 1st to 8th gear. I stopped and ran the gear shifer back and forth. It seems to change the gear ratio when I do this. Doesn’t seem as if the gears have gotten back to the original ratio….. Is there a system in the Shimano 8 speed internal that allows for the changing of gear ratio’s by swithing the shifer while sitting still??

    Reply
  57. Dan

    October 23, 2009 at 1:26 am

    I have a used bike w/ the Inter8 hub, and was getting grinding noises and slippage in the 5-6. I disassembled the hub and found rust on the roller bearings that encircle the carrier unit. I cleaned that up and greased the whole thing with Nexus grease and reassembled it. Now the only thing that is working when I shift is the clutch. That is, gears 1-4 are one speed, and gears 5-8 are another speed. I’ve, sadly, coverted the thing to a two-speed hub. Anything come to mind as a cause for this?

    Reply
    • rudolfganz

      October 31, 2009 at 3:34 pm

      Dan,
      happens the same to me. I disassambled it again and again and again until it works perfectly. You need a lot of time laerning who this machine works. But after it, you will never have the trouble again. The rust comes from wrong building of the hub.
      Take your time, and get a place for all those parts… =)

      Reply
      • rudolfganz

        October 31, 2009 at 3:38 pm

        Don’t forget the explosion drawing of the hub. Without wont work!

      • Dan

        November 3, 2009 at 8:03 pm

        Thanks for the feedback. I’ve disassembled and reassembled the hub. It’s still a 2-speed. One thing that is not clear to me is the function of the internal tooth on the carrier unit. On the hub I’m working on, the internal tooth is free to rotate. Is it supposed to be able to rotate like this? I’m thinking that it should not be able to rotate freely. Input??

    • rudolfganz

      October 31, 2009 at 3:42 pm

      I think the problem you have was in the calibration on the hub. So you don’t need to rebuild the whole hub.

      Reply
  58. ugge2002

    November 10, 2009 at 5:53 pm

    Hello.

    anyone have a instruction for assembly of the hub axle unit on a shimano nexus 8 hub??

    Reply
  1. 1 Shimano Nexus INTER-8 Reviews, Pictures, Maintenance, Installation and Drawings « Hubstripping.com Pingback on Oct 17th, 2007 at 10:05 pm

    [...] Oct 17, 2007 in Comparison & Review, ShimanoTags: 8, 8 Speed, comparison, Drawings, gear, hub, inter, INTER-8, internal, Manual, nexus, review, SG-8C20, SG-8R20, SG-8R25, Shimano, Spareparts The most sold internal geared hub in the world is now online on Hubstripping: Shimano Nexus INTER-8. [...]

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