Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Hub gear shifting problems - hub is too tight or too loose?

Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Hub gear shifting problems - hub is too tight or too loose?

Old 05-08-08, 08:32 AM
  #1  
A potato in every bite...
Thread Starter
 
seans_potato_business's Avatar
 
Join Date: Oct 2006
Location: Edinburgh, Scotland
Posts: 56

Bikes: Pashley Princess Sovereign <3

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Hub gear shifting problems - hub is too tight or too loose?



This picture shows the inside of my bike hub on the side of the brake. In the centre is a nut thing that holds in the gubbins on the other side, where the rear sprocket is located. It is a hub with internal gears and there is another nut located on the other side (the sprocket-side) which keeps the sprocket and splined-sprocket holder in place, on top of a couple of springs and sets of ball-bearings. My problem is that the gears are not shifting (and the shifter lever is difficult to move) and I'm having trouble determining how tight each nut should be. It moves to the lowest gear easily enough, but if I want it in high gear, I have to keep back-pedaling and going over bumps. Too tight, and it seems to stop the wheel from being able to turn at all, and too loose and the gears stop working. Does anyone have experience with these fickle internal gear systems? It's a SRAM super 7.
seans_potato_business is offline  
Old 05-08-08, 09:06 AM
  #2  
Senior Member
 
Join Date: Jul 2003
Location: Brooklyn, NY
Posts: 1,453
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Start by verifying that your clickbox is in working condition and both shift pins move freely.
K6-III is offline  
Old 05-08-08, 10:09 AM
  #3  
A potato in every bite...
Thread Starter
 
seans_potato_business's Avatar
 
Join Date: Oct 2006
Location: Edinburgh, Scotland
Posts: 56

Bikes: Pashley Princess Sovereign <3

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Both of those are fine but thanks. When I take the clickbox off the hub, the gear lever works great.
seans_potato_business is offline  
Old 05-08-08, 07:38 PM
  #4  
Senior Member
 
Join Date: Jul 2003
Location: Brooklyn, NY
Posts: 1,453
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
You can find the service manual here:

https://www.sram.com/_media/pdf/sram/...GHS_MY06_E.pdf

First thing I'd check when disassembling the hub is the return spring. Those are known to need replacement on the Sram S7.
K6-III is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.