are you 100% sure it's the chain? I'm asking because sometimes it's very difficult to identify the exact cause of a noise coming from the bike.

It could be a rear derailleur adjustment issue. But since it only happens on the downstroke I would double check the chainring bolts. They could be lose, causing the chainrings to move while you apply force.

If it is a tri bike with bar end shifters I'd suggest taking it out of "click click" index shifting mode so you can fine tune the tension on the rear derailleur cable. See if that will take care of it. If it does, it's just an adjustment on the RD. Otherwise you'll know that this is not the issue.

How long ago did you get your new bike. Maybe your cables just stretched and you need a quick adjustment. Never adjust the index screw if shifting worked fine initially with the same wheel/casette. It's most likely just a cable tension problem.

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�The greater danger for most of us is not that our aim is too high and we miss it, but that it is too low and we reach it.� -Michelangelo

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I get this problem on my P3, I've changed the chain twice and still get a continous grinding noise. I've tried two Dura Ace and one Wiperman and they both make the noise. I'm starting to wonder if it's normal for 10 spd systems. Took it back to the shop as well but couldn't fix it either.

Got a bit of the same problem. Got 2 bikes with new da. TT bike no problem. Road bike, even if they report rain 2 weeks ahead the chain start grinding on me.

My earlier 9 speed no problem. New 10 speed I think is a bit sensitive. Wash a lot and good oil have helped me. After 2 months it has actually become a bit better. But still not to happy. Have tried different mechanics changed chain and casette.

Can't stand doing long rides with this grinding.

It's usually not the chain itself that is noisey, unless it and/or the cassette are worn out. More likely it's a der. adjustment problem.

Is it quiet on the mid range rear cassette gears and louder at the low/high ends. If so, it's an adjustment problem.

Something's wrong. Take it to another shop. Drivetrain should be very quiet.

Also check the lubrication on your pedals. For example, if you have Speedplays and they spin freely by hand, they are lacking lubrication and can make noise under load.

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Bob Williams

Chain is dry. Lube it.

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Twenty-five years and my life is still
Trying to get up that great big hill
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