Rear mech upper cog lateral play

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Rear mech upper cog lateral play

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wassertreter

Post subject: Rear mech upper cog lateral play

Posted: Mon May 07, 2012 4:50 pm

Joined: Tue Apr 12, 2011 8:08 am
Posts: 1293
Location: Old World

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.

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Bikes: Raceur, Beateur

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clarkson

Post subject: Re: Rear mech upper cog lateral play

Posted: Mon May 07, 2012 5:41 pm

Joined: Sat May 07, 2011 12:23 am
Posts: 150

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.

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wassertreter

Post subject: Re: Rear mech upper cog lateral play

Posted: Mon May 07, 2012 7:14 pm

Joined: Tue Apr 12, 2011 8:08 am
Posts: 1293
Location: Old World

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

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thisisatest

Post subject: Re: Rear mech upper cog lateral play

Posted: Tue May 08, 2012 3:54 am

Shop Owner

Joined: Sat Jun 13, 2009 4:02 am
Posts: 1842
Location: NoVA/DC

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

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5 8 5

Post subject: Re: Rear mech upper cog lateral play

Posted: Tue May 08, 2012 12:21 pm

Joined: Sat Jul 29, 2006 2:36 am
Posts: 881
Location: UK

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

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sugarkane

Post subject: Re: Rear mech upper cog lateral play

Posted: Tue May 08, 2012 12:57 pm

Joined: Wed Jan 19, 2011 11:14 am
Posts: 892

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....

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thisisatest

Post subject: Re: Rear mech upper cog lateral play

Posted: Wed May 09, 2012 3:15 am

Shop Owner

Joined: Sat Jun 13, 2009 4:02 am
Posts: 1842
Location: NoVA/DC

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.

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