!70mm Crank over 175mm Benifits and penalties, please help!!

Gekkoman
Gekkoman Posts: 31
edited November 2010 in MTB general
Just thinking about buying a Shimano SLX dual crankset C/W bash gaurd.
Just wondering about the benifit of 170mm crank over 175mm apart from the obvious ground clearance, are there any pedaling benifits or penalties with using a 70mm?
Please help!!!

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