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Which do I need?
I'm running an xt compact crankset and an xt cassette, but forget which on:

If it's the 34, I want the long?
If it's the 32, I want the medium?
Or am I mistaken?

I'm at work and can't remember which I have, hence the general inquiry.
Thanks.
 

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bang
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danK said:
Which do I need?
I'm running an xt compact crankset and an xt cassette, but forget which on:

If it's the 34, I want the long?
If it's the 32, I want the medium?
Or am I mistaken?

I'm at work and can't remember which I have, hence the general inquiry.
Thanks.
cage length is determined by your crank and cassette. you take the difference of crank teeth and add those to the difference of cassette teeth to come up with a total capacity. different caged deraillers have different capacities. the medium cage X-0 has a capacity of 37 teeth, while the long cage has a capacity of 45 teeth. so if you have a 22-32-44 crank and 11-32 cassette, that is a capacity of (44-22) 22 + (32-11) 21 = 43 teeth, thus you would need the long cage derailler, as that combination of crank and cassette would exceed the capacity of the medium cage RD.

i believe the only size the X-9 comes in is long cage. but even if it did have a medium cage version, you would want a long cage for both of those cassettes (assuming 11-32 and 11-34 and that you have a 22-32-44 crank).
 
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