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Shimano XT crank length and cage length questions?

donnie murdodonnie murdo Posts: 986
edited May 2008 in MTB workshop & tech
Can anyone tell me the answers to the following please?

What is the standard length of a crank arm ie what would most factory built bikes come with 170mm length or 125mm length?

And:

What is the normal cage length of a rear mech lon or medium?

Thanks in advance,

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