Rear mech upper cog lateral play

Discuss light weight issues concerning road bikes & parts.
Post Reply
HillRPete
Posts: 2292
Joined: Tue Apr 12, 2011 8:08 am
Location: Pedal Square

by HillRPete

I took apart a bike and found the Ultegra rear mech upper cog to have lateral play of about 3-5mm. The bike was in quite regular use for a few years. Is that play normal, or should I be looking out to replace parts? Thanks.

by Weenie


clarkson
Posts: 188
Joined: Sat May 07, 2011 12:23 am

by clarkson

Yes this is normal. The pulley is designed to have some lateral movement to negate any small misalignment between the cassette and derailleur. Unless there is damage to the bushing/bearing, or wear to the pulley teeth, you can probably re-use it.

HillRPete
Posts: 2292
Joined: Tue Apr 12, 2011 8:08 am
Location: Pedal Square

by HillRPete

Thanks. Interestingly the Tiso pulleys I have checked against on another, unused RD don't have any play.

thisisatest
Shop Owner
Posts: 1980
Joined: Sat Jun 13, 2009 4:02 am
Location: NoVA/DC

by thisisatest

that's what makes tiso, and most other aftermarket pulleys, inferior. best upper pulley is dura ace. ball bearings AND floating.

5 8 5
Posts: 1353
Joined: Sat Jul 29, 2006 2:36 am
Location: UK

by 5 8 5

Isn't 3-5mm play a bit excessive? I thought about 1mm was the norm for Shimano?

User avatar
sugarkane
in the industry
Posts: 1798
Joined: Wed Jan 19, 2011 11:14 am
Location: SYD
Contact:

by sugarkane

5mm is way to much... 1mm total is ok.. I say it's new pully time..
I just replaced a set of DA pullys on a friends bike that had that kinda play with some spare ( second hand ) extralite pullys I had... It didn't shift so well before now it's like butter....

thisisatest
Shop Owner
Posts: 1980
Joined: Sat Jun 13, 2009 4:02 am
Location: NoVA/DC

by thisisatest

im assuming the measurements given are exaggerated. if the play is purely lateral, it's fine. if the play allows the pulley to "roll" (top goes left, bottom goes right), then it needs to be replaced.

by Weenie


Post Reply
  • Similar Topics
    Replies
    Views
    Last post