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Thread: A little rough

  1. #1
    Senior Member
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    This is really hard to explain. When I am in the large chain ring on my bike and I put a lot of torque, the pedalling feels a "little rough". I can't hear anything but I can feel it in my feet. Mostly my right foot. Its a new (2 weeks old) specialized sirrus elite. I'm not cross chaining, and everything is well lubed. Some info that might be relavent:

    FRONT DERAILLEUR Shimano Deore, 31.8 clamp, bottom pull
    REAR DERAILLEUR Shimano Tiagra
    CASSETTE SRAM PG-850, 8-speed, 12x26t
    CRANKSET RPM Compact, five arm, polished
    CHAINRINGS 50Ax34S Hypershift

    Anyone have any ideas? I know its a vague explanation, but I appreciate any help.

  2. #2
    Lawman
    Join Date
    Jan 2005
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    San Diego, CA
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    Spec. Tarmac Expert SL4
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    Ideas:

    1. derailleur/indexed shifting slightly out of adjustment so the chain only rubs a little when you twist the bottom bracket/cranks with high pedal load

    2. cranks not tightened to spec, check with a torque wrench

    good luck

  3. #3
    Senior Member
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    I followed the park tools website when adjusting the RD,

    "Once a too-tight rattle is achieved, turn barrel adjuster 1/4 turn clockwise, to release inner wire tension, and pedal again. Listen and look for signs of scraping or rattling. Continue turning barrel adjuster 1/4 turn clockwise at a time until rattle disappears."

    But since everything is so new it is hard to hear the rattle. Maybe the wire tension is a little tight. I will try and loosen it a little and see how it goes. Thanks!

    If this doesn't work, I have to head to the LBS this weekend so I will get them to check the crank-bolt torque as I don't have a rench.

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