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  1. #1
    bicyclebikes
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    ultegra acting up

    hey,
    so i bought a new trek madone 4.7 about two months ago, and i've had some problems with the ultegra. whenever i start pedalling faster or putting more pressure on the pedals it starts making this weird grinding noise really loudly. does anyone know what that is or how i can fix it?
    thanks

  2. #2
    Senior Member
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    Feb 2005
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    Oklahoma
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    Trek 5500, Colnago C-50
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    If you bought the bike from a dealer he should do the first tune up at no cost to you.
    Is the noise caused by the chain rubbing the front derailleur?

  3. #3
    bicyclebikes
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    they offer a 200 mile tune up and i already had that, and the front derailleur is fine

  4. #4
    Senior Member
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    Is it possible that a brake pad is dragging on a rim?
    Are the wheel axles fully seated in the dropouts? (Open and close the skewers with the bike upright and the wheels on the ground.)

  5. #5
    bicyclebikes
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    Ya the brakes and wheels are all good

  6. #6
    Senior Member
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    Aug 2005
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    Pittsburgh, PA
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    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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    You could need a rear derailleur cable tension adjustment if the noise is the chain rubbing against an adjacent cog. +1 on taking it back to the dealer for a quick look.

  7. #7
    Senior Member
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    Is it on the biggest rear cogs? I've noticed this on mine...there's like a RD chatter in the low gears...

  8. #8
    Senior Member
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    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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    Quote Originally Posted by sakonnetclip View Post
    Is it on the biggest rear cogs? I've noticed this on mine...there's like a RD chatter in the low gears...
    That sounds like the "B-screw" is set too far out and the rear derailleur's upper pulley is rubbing on the cog teeth.

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