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Old 04-25-2014, 12:40 AM
Theon Theon is offline
Motorized Bicycle Elite Member
Join Date: Jan 2014
Location: FNQ Australia
Posts: 1,440
Default Re: Bought bottom end from Boy Go Fast, should I be worried?

Easiest way is to measure from the main bearing pin on the crank to the edge of the big end pin.
4mm means you have a 40mm crank, 3mm has you a 38.
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