[crank lenght] Better leverage ??
"le-sheq" (clip) is the leverage benefit big enough to justify extra money
spent on the longer (175) crankset?
^^^^^^^^^^^^^^^^
175/172.5= 1.4% I hardly think you would notice it. It would be equivalent
to half a tooth change on a 34 tooth rear cog. (Please don't tell me you
can't change less than one tooth. ;-)
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