38t x 12-32 gear configuration help!
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thomasraelburke



Joined: 15 Jan 2009
Posts: 17
Location: hartlepool

PostPosted: Wed Jan 21, 2009 4:48 pm    Post subject: 38t x 12-32 gear configuration help! Reply with quote

im setting up a ss 38t cog up front with a 12-32 cassette in back, 8 speed.
what size rear derailleur do i need, im guessing 8 speed but what size cage is best etc. also what size chain for this setup. im hoping i dont need a chain guide cos they cost a bomb! but if i do any cheap good ones that could be recomended would be class. cheers folks
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Steve Kish



Joined: 06 Jan 2009
Posts: 8032
Location: Near Heathrow

PostPosted: Wed Jan 21, 2009 10:25 pm    Post subject: Reply with quote

My XT short cage says 'Max 28T', so I recon a long cage one.

I use a 105 on my road bike with 38T inner ring but that's with an 11-26 cassette.

I have seen a few medium cage ones on the Bay of Eee, but they all seem to be a**e-about-face Rapid Rise ones. Crying or Very sad

Shouldn't need a chain guide with a single ring unless you're using a bracket axle far too long. However, in the unlikely event that you do, a front mech without a cable may be a good option - just tweak this into position with the adjustment screws.

About 98% of Shimano rear mechs are interchangeable and not dependant on 7/8/9 speed cassettes, so that bit's easy.

Any 7/8 speed chain should fit.
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thomasraelburke



Joined: 15 Jan 2009
Posts: 17
Location: hartlepool

PostPosted: Sat Jan 24, 2009 6:58 pm    Post subject: Reply with quote

cheers...sorted!
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tomlevell



Joined: 13 Apr 2008
Posts: 989

PostPosted: Sat Jan 24, 2009 7:18 pm    Post subject: Reply with quote

A short cage should work as it's assuming your running a triple ring set up which makes the change in cogs at the back far larger.

And yeah a front mech fixed in position should do the job.
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