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PostPosted: Thu Aug 23, 2007 11:43 am 
Devout Dirtbag

Joined: Wed Jun 14, 2006 9:37 pm
Posts: 104
Is there any width differences between the cages between 8 and 9 speed shimano rear mechs in terms of the jockey wheels they accept? I've been sent a 9spd wheel by a shop instead of the 8 i ordered, is it going to be too narrow? Or will it mess something else up - there will be an 8sps jockey wheel as it's partner.

Also - what are the widths for 7/8/9 spd jockey wheel bolts? They have some ally ones here:

http://www.billys.co.uk/english/group.p ... kp44s64b35

but there are 3 lengths listed - is it long for 7, medium for 8 and short for 9spd? might do a group buy and post them cheaply if anyone wants a set but not pay twice as much in postage (couldn't find post price but probs expensive)

Ian


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PostPosted: Thu Aug 23, 2007 11:55 pm 
Old School Hero
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Joined: Wed Jun 20, 2007 3:40 am
Posts: 230
Location: Hull
I'm only using my uncertified logic, but your summation about decreasing bolt size for 7,8,9sp makes sense as the chains are narrower. As for jockey wheels I don't think you'll have a problem so long as it's the bottom one you are replacing and not the fancy floating top wheel(shimano mechs).

Ps cannot gaurantee the validity of info supplied!

Jim


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PostPosted: Fri Aug 24, 2007 12:07 am 
Retro Guru
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Joined: Fri Sep 22, 2006 1:12 am
Posts: 2461
Location: Hobart, Tasmania, Australia
I'm not aware of any great difference between 8 and 9 speed Shimano derailleur cage widths and have been running 8 speed chains on M952 derailleurs for years with no dramas at all.

The only diference that I was aware of was the number of jockey wheel teeth from memory 9 has 11 teeth, 8 has 10.


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PostPosted: Fri Aug 24, 2007 8:31 am 
Old School Grand Master
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Joined: Thu Jan 25, 2007 9:37 am
Posts: 4916
I ran a Mega9 rear mech with an 8sp IG chain and cassette for ages with no problems.


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PostPosted: Fri Aug 24, 2007 10:44 am 
Devout Dirtbag

Joined: Wed Jun 14, 2006 9:37 pm
Posts: 104
Yeah, I'm happy running 8spd drivetrains with a 9spd rear mech, and lots of shops/websites etc say this is fine - the chain easily fits over the wheels, and evidently the 9spd mechs aren't narrow enough that they stop the fatter 8 spd chains going through. Unfortunately I am replacing both jockey wheels! Anyone know why the number of teeth goes up with the number of rear cogs? And as no-one has siad definitely don't use a 9spd jockey wheel with 8 spd mech and drivetrain, I guess I can give it a go... Thanks for your replies!

Ian


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PostPosted: Fri Aug 24, 2007 10:49 am 
Old School Grand Master
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Joined: Thu Jan 25, 2007 9:37 am
Posts: 4916
I don't think the tooth sizing on the jockey wheels changed, the 9sp jockeys are just bigger. I think they did it to make them run a bit smoother. They'll be fine on an 8sp mech.


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