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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 08-06-10, 02:31 PM   #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
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Old 08-06-10, 02:46 PM   #2
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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?
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Old 08-06-10, 02:47 PM   #3
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they offer a 200 mile tune up and i already had that, and the front derailleur is fine
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Old 08-06-10, 02:57 PM   #4
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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.)
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Old 08-06-10, 03:14 PM   #5
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Ya the brakes and wheels are all good
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Old 08-06-10, 05:34 PM   #6
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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.
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Old 08-06-10, 07:14 PM   #7
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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...
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Old 08-06-10, 07:17 PM   #8
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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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