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  1. #1
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    loud cranking sound

    Hi all,
    I've had my bike for about two months and am having so much fun w it. However, it occationally makes some loud noise and it makes me think the chain slips. It happens when I depart AND when I apply (heavy) pressure on the pedal. It doesn't make this noise every time though. Anyone has any idea? By the way, the bike is a Trek 4500. Thanks for your input.
    Luke

  2. #2
    Wood Licker Maelstrom's Avatar
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    If you continually start in a really hard gear you are really mashing several parts on your bike. Try to do a start in an easier gear. It could be slipping because

    a) Chain is stretched
    b) Cassette is worn in the gear you use most
    c) The freewheel is 'too' whobbly and when you really mash down it turns in just enough to force a skip

    All 3 are feasible and without being there to watch and listen myself I can't offer much more.

    It could also be a loose crank. I used to get a loud cracking noice. It was where the crank arm engages with the spline. I have also had a loose bottom bracket which gave a similar sound.

  3. #3
    Senior Member mindbogger's Avatar
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    yea i am gonna hafta agree with the bottomw bracket. Loose bottomw bracket gave my bike a clicking noise evertime i pedal hard. Havn't fixed it yet but i will soon
    00' Cannondale R1000
    01' Devinci Chilipepper

    When sh*t hits the fan, everything I'm not, made me everything I am.

  4. #4
    Wood Licker Maelstrom's Avatar
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    Originally posted by mindbogger
    yea i am gonna hafta agree with the bottomw bracket. Loose bottomw bracket gave my bike a clicking noise evertime i pedal hard. Havn't fixed it yet but i will soon
    You can strip the thread in the bb tube (I forget the name) and screw it so bad you need a new frame...thats the type of thing I tighten right away

  5. #5
    Senior Member mindbogger's Avatar
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    Originally posted by Maelstrom
    You can strip the thread in the bb tube (I forget the name) and screw it so bad you need a new frame...thats the type of thing I tighten right away
    ohhh shoot.....better start tightning....thanks for the heads up...was gonna go for an evening ride but better cancel it.

    Thanks mael
    00' Cannondale R1000
    01' Devinci Chilipepper

    When sh*t hits the fan, everything I'm not, made me everything I am.

  6. #6
    Wood Licker Maelstrom's Avatar
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    It does take time to screw it up but I don't take chances. I messed up my commuter way back...I hate replacing frames...same with loose headsets...never ride with one of those either.

  7. #7
    NCAA - DUAL CHAMPIONS! a2psyklnut's Avatar
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    You just got it right? Heck, I'd take it back to the shop and ask for your "should be included with all new bike purchases" free 30 day tune-up!

    Even if it's past the 30 day, any respectable shop should provide you with an "initial Break-in period adjustment".

    L8R
    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
    "Your Bike Sucks" - Sky Yaeger

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