Old 10-06-11, 05:30 PM
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fietsbob 
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24t is smallest for 74 bcd triple, 58 bcd gets you down to 20't

outers its 34 for 110, 38 for 130
94 gets you down to 32t.

94 /58 is a MTB compact.. 110/74 is a trekking /*non compact triple
[lose the 3rd ring and 110 is a compact double , in jargon chaos]

changing over to a new MTB crank , puts you into a hollow tech,
and the BB moves to External.
so then Yes you have to adopt a whole new set..
Square taper is still on the market , then the crank set design hi/low/medium profile matters as far as How the arms interact with the BB spindle length..
for the sake of confusion reduction , get the whole set as a kit.

or farm the job out to the LBS and let them get it all straight.
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