how do I know what size crank is on my bike



speedy_gt

New Member
Dec 28, 2004
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I have a bent crank and need to replace it. I will more than likely buy off of e-bay, but I need to know what size crank to buy. How do I check the size?
 
Look on the inside of the crank arm with the chainring and you should see an engraved number that can range from 170 to 175.
 
If you can't find the engraved number you can measure (in millimeters) the crank arm from the center of the pedal to the center of the bottom bracket.