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Dead Rats
PostPosted: Tue Jan 19, 2010 3:25 pm 
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Apols for ROAD related question, but one of you guys will be bound to know...

When using a 9 speed cassette with a triple front set-up, what's the max size rear cog I can realistically use with a short cage rear mech... 27, 28, 29? My smallest cog is likely to be a 12 and the front rings are 30-39-50 (so 20 difference up front).

Is there a rule of thumb? Is it the difference between 9th and 1st that is key? Or the difference between 'big to big' and 'small to small'?
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mechagouki
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PostPosted: Tue Jan 19, 2010 3:58 pm 
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You should find your answer here:

http://www.retrobike.co.uk/forum/viewtopic.php?t=85597

If you never cross-gear (big ring/biggest cog or small/small) you can run most combinations with a short-cage, but the one time you forget could cost you a rear mech.
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Dead Rats
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PostPosted: Tue Jan 19, 2010 4:08 pm 
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that's good of ya - thanks mecha!!
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hamster
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PostPosted: Wed Jan 20, 2010 10:52 am 
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One other thing to remember is that road mechs have a different slant on the parallelogram, so they don't get on with very large rear cogs. Campag will manage up to 29, Shimano allegedly 30.

Just be careful if you are hoping ot run something huge like a 32 or 34, e.g. in a 1x9 setup.
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Dead Rats
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PostPosted: Wed Jan 20, 2010 11:10 am 
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hamster wrote:
One other thing to remember is that road mechs have a different slant on the parallelogram, so they don't get on with very large rear cogs. Campag will manage up to 29, Shimano allegedly 30.

Just be careful if you are hoping ot run something huge like a 32 or 34, e.g. in a 1x9 setup.


cheers ham

probable set up will be 30/39/50 and 12-28 :wink:
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