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Ultegra component question(6 posts)

Ultegra component questionraknyc
Jun 23, 2001 7:17 PM
Ok, I am a lifetime mountain biker who just purchased a Giant TCR1 road bike which is all Ultegra. Does anyone out there know if it is normal for the chain to be rubbing against the front derailluer when I am in the highest and lowest gears in the rear. (and even the second highest and lowest) I have over 5000 miles on my (inexpensive) mountain bike, and I don't think I have had one pedal stroke when my chain made any noise, let alone the grinding that this bike makes.
Thanks for any experienced thoughts...
re: Ultegra component questionDave Hickey
Jun 23, 2001 8:30 PM
It sounds like you need the limit screws adjusted. There are two screws on the derailluer that limit the travel. Turn them 1/4 turn at a time until the rubbing stops. Don't adjust too much or chain will go into the spokes.
re: Ultegra component questionraknyc
Jun 23, 2001 8:42 PM
I think the limit screws are adjusted properly- at least that's what two mechanics told me. I guess what you are suggesting is that an all Ultegra bike should be able to be adjusted without the chain rubbing...(that's what I thought too) I guess I need to bring it in somewhere, 'cause I can't seem to get it right. Thanks for the reply
re: Ultegra component questionKEN2
Jun 23, 2001 8:54 PM
Did you know that the front shifter has a trim adjustment for the front derailleur? When on the small chainring, just pivot the lever partway until it "catches;" in the big ring, pop the inside lever just partway. Both of these adjustments will cure your problem.
Jun 23, 2001 10:19 PM
Is the chain only rubbing when you are in gear combinations such as the big ring up front and the highest cog (the largest one) in the back? Or the little ring up front and the lowest gear (the smallest one) in the rear? If so, this is normal. It is called cross-chaining, and it isn't a good gear to be in. When you are cross chaining, you are in repetitive gear ratios that could also be found with the chain at a less severe angle. An example, your 53 by 23 combination (your gear ratios may differ) can be found by using your 39 front with a cog closer to the middle of the cassette. This results in the chain being at less of an angle, hence no rubbing on the derailler. The chain being at a lesser angle also results in less drivetrain wear, and a smoother drivetrain.

If cross-chaining isn't the result of your problem, I would check out the adjustment of your FD.
Could it be a bent cage?Kerry Irons
Jun 24, 2001 5:24 PM
Your description is not too thorough, but it could just be that the side(s) of the cage got bent, causing one or both sides to rub. Even if it isn't bent, it can be spread a little, which also might eliminate the problem without affecting the shifting.