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  1. #1
    Junior Member
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    Jul 2010
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    Bike makes whirring noise while pedalling...

    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.

  2. #2
    Senior Member Dilberto's Avatar
    Join Date
    Apr 2007
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    Bad bottom bracket...replace it asap.
    2001 Cannondale Bad Boy Ultra - Shimano XTR/SRAM X0; Magura, Velocity Blunt SL
    2012 Trek Superfly 100 Pro - SRAM XX; Bontrager RXXXL; Easton Haven; Rock Shox SID XX

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