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PostPosted: Sat May 25, 2013 9:45 am 
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Joined: Mon Apr 03, 2006 5:11 pm
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Bought a cheap shimano 10t 8spd lower jockey wheel for an M900 rear mech.

The new jockey is 10 mm wide.

The old ones in the m900 measure 7mm

What's going on! Is the new one wrong somehow? Or have the old ones been misassembled?


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PostPosted: Sat May 25, 2013 11:01 am 
retrobike rider
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Location: Yorkshire, England
they are a ball bearing one. there are two flat metal plates clipped on the ends.
they are classed as narrow, but then the XT normal ones are.


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PostPosted: Mon May 27, 2013 6:49 pm 
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Yes the M900 had the "sealed ceramic bush" jobs, not really worth paying extra for....


Well It seems the M900 wheels should be narrower than STX/Alivio replacement 8spd jockey wheels. M900 are the same width as 9spd jockey wheels, but with 10 rather than 11 teeth.

I'm now sorted after tracking down narrow 10t wheels.


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PostPosted: Mon May 27, 2013 8:05 pm 
retrobike rider
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was8v wrote:
Yes the M900 had the "sealed ceramic bush" jobs, not really worth paying extra for....


Well It seems the M900 wheels should be narrower than STX/Alivio replacement 8spd jockey wheels. M900 are the same width as 9spd jockey wheels, but with 10 rather than 11 teeth.

I'm now sorted after tracking down narrow 10t wheels.

Interesting. The early Stx where still on 7sp, only later did it go 8sp. And the 7 must have been wider as I remember having trouble trying the modify an 8sp version with the older parts. They where both the same tooth count of course. Would need to check if 'narrow' was on them. I wounded if you actually where given a 7sp version?
Something for a rainy day when I'm bored. Get them out and measure.

Ball bearing jockey, something that made m900 more expensive than 735. Worked well and a quick clean and service got the lower running again.
The top was the sealed ceramic, but that isn't ball bearing

Mine didn't seem to wear out the way cheaper ones did at the time.


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PostPosted: Mon May 27, 2013 8:36 pm 
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I tried "Alvio/STX/STX RC" from http://www.chainreactioncycles.com/Mode ... odelID=885

too wide for M900 (unless you got a pair and some longer bolts?)


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