Mountain Biking - Bike makes whirring noise while pedalling...
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I have a trek 3700 which is 4 years old and in awesome condition. However while pedalling the bike is making a sort of whirring noise ang gets stiffer than normal. It happens once per turn of the crank and comes from the crank area. It is a lot more obvious in higher gears but still occurs in lower ones. :mad:
10-13-10, 12:11 PM
Bad bottom bracket...replace it asap.
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