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

cassette issue

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.

cassette issue

Old 10-09-10, 04:03 PM
  #1  
micah356
Member
Thread Starter
 
Join Date: Nov 2009
Posts: 28
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
cassette issue

I've just got a new rear wheel. I put on the lockring to the recommended torque, but the last few cogs (the ones that aren't attached together) are still able to move around slightly. I don't know why this might be. Is it possible there is a spacer or something missing? Its a Deore XT/M756 hub with an 8 speed Shimano cassette.
micah356 is offline  
Old 10-09-10, 04:16 PM
  #2  
reptilezs
Senior Member
 
Join Date: Sep 2004
Location: boston, ma
Posts: 2,896
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Likes: 0
Liked 1 Time in 1 Post
hard to say without looking at it but i guess a spacer is missing in the cassette stack.
reptilezs is offline  
Old 10-09-10, 04:21 PM
  #3  
micah356
Member
Thread Starter
 
Join Date: Nov 2009
Posts: 28
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The amount of play in it is incredibly small - I only noticed by hearing the sound it makes once per revolution of the cassette while I was installing a new chain. It might also be possible that it is not torqued quite enough. There is very little depth for the lockring tool to engage the lockring, and I had issues with it slipping. I did (I think) eventually get it on though, and the wrench clicked. I just don't really see how I might have lost a part of the cassette?

I guess I'll just head to the LBS tomorrow.

Last edited by micah356; 10-09-10 at 04:25 PM.
micah356 is offline  
Old 10-09-10, 05:27 PM
  #4  
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,544

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 139 Post(s)
Tagged: 1 Thread(s)
Quoted: 5703 Post(s)
Liked 2,430 Times in 1,343 Posts
Cassettes must overhang the freehub body slightly. Otherwise the lockring bottoms out on the body and can't properly compress and secure the cassette. It's analogous to threadless headsets which require the stem/spacer stack to be taller than the steerer to work. Add the thinnest spacer that's wider than the gap behind the cassette to establish the overhang and you'll be good to go.

BTW- you might not have lost a part, there's slight variation between brands in freehub body and cassette widths, so some combinations need spacers and others don't.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

Just because I'm tired of arguing, doesn't mean you're right.

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 10-09-10, 07:20 PM
  #5  
larry_llama
Senior Member
 
Join Date: Dec 2005
Posts: 329
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Some cassettes have a very thin spacer between the two smallest cogs, perhaps it is missing? Experience tells me that the cassette should have no play even if you only hand tighten the lockring, so adding torque is unlikely to help. The problem is, the smallest cog will tighten against the end of the freehub body and will not move any further no matter how tight you turn the ring. So don't over torque it.
larry_llama is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
chris1969
Bicycle Mechanics
6
08-11-17 04:55 PM
hubcyclist
Bicycle Mechanics
3
09-26-14 09:26 PM
gearhead82
Bicycle Mechanics
3
07-15-14 11:04 AM
BROOKLINEBIKER
Bicycle Mechanics
4
02-26-14 06:19 PM
AshbyRich
Bicycle Mechanics
10
02-04-13 02:59 AM

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


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.