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PostPosted: Sun Jan 23, 2011 8:14 pm 
Retro Guru
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Joined: Fri Sep 19, 2008 4:37 pm
Posts: 5198
Location: North West
I have a 22.34.44 crank and a 12.13.14.15.17.19.21.24.27 cassette.

If I understand correctly :

Crank : 44 - 22 = 22
Cassette : 27 - 12 = 15
22 + 15 = 37

So I need a mech with a 37 tooth capacity ?

According to CRC my mech copes with 33 tooth difference.

So does this just mean that on my small cog and my smallest 4 sprockets I will just have a slack chain ?

If so that's not really a problem is it because two are 'bad' gears anyway ?

How much 'margin' is there on the figures shimano quote ?

My old setup on the Marin with a short cage XT was similar and never caused a problem ? I had a 12.28 and the mech has a 28 tooth capacity. I only seem to remember a slack chain on the bottom 2 suggesting the figures quoted are on the safe side ? :?

All input appreciated 8)

WD :D


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PostPosted: Sun Jan 23, 2011 8:24 pm 
retrobike rider
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All you need and more in this thread

http://forums.mtbr.com/showthread.php?t=205890


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PostPosted: Sun Jan 23, 2011 8:31 pm 
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^ That thread is very good.

I find that some mechs can do a bit more than their stated capacity. I'm running a medium cage XT (33t capacity) with 34t difference and there's no probs. Admittedly it's only one extra tooth.


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PostPosted: Sun Jan 23, 2011 10:26 pm 
Retro Guru
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Good link 8)

Seems I wasn't far off and looks like I will be OK :D

Cheers,

WD :D


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