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Help!! Drivetrain noise(4 posts)

Help!! Drivetrain noiseDean
Sep 7, 2001 4:19 AM
My bike has developed a creaking noise when I am sprinting out of the saddle. It is mainly on the downstroke of my right leg. It seems to be coming from my bottom bracket area. I tried tightening the bottom bracket and ended up almost completely stripping the teeth used while tightening. I also tightened the chainrings and the cranks. Nothing was loose and I still have the noise. What is it? This is a Chorus 10 group. Thanks in advance for any help.
Sitting or standing?Mike Prince
Sep 7, 2001 5:29 AM
If it only happens sitting, check the saddle/seatpost. If it happens all of the time, it may be in your pedal. Often my "BB noises" are worn LOOK cleats in disguise or ones in need of a little care. Seat post noises can easily travel down the seat tube and appear to come from the BB as well.

Does the BB feel OK without the crank on? Meaning does it spin roughly at all? That's probably a long shot with a fairly new BB though but it has happened.

Also, a few weeks back someone had a similar problem and it was a misadjusted rear axle if memory serves right.

Good luck.
Sitting or standing?Dean
Sep 7, 2001 5:37 AM
This happens when standing. The bottom bracket spins fine with no cranks. One thing to mention though is when this first started, I removed the cups from my bottom bracket, cleaned, lubed and re-installed. But today I read that you are not supposed to lubricate these cups, which I did last time they were off. Should I not have done this? Should I remove them and whipe the lube off? Funny you mention LOOK pedals, that is what I use. I have about 1700 miles on them. How long to the cleats last? I would hope more than 1700 miles, but I will check into it. Thanks for the help.
LOOKsMike Prince
Sep 7, 2001 3:58 PM
I have a new pair of SIDI's which I have put about 1,000 miles on since I got them at the end of July. They were driving me crazy with creaking. Checked everything, no solutions. Had to be the shoes. Thanks to grzy mnky's advice, some loctite on the cleat screws reduced but did not eliminate the problem. The cleats still looked new as I am careful about walking on, unclipping at stops, etc. The noise was driving me crazy.

To make this story short, installed a new set of cleats as a last resort last week. Old cleats still looked good, but after taking them off was able to notice two HUGE grooves worn into the rear of each cleat by the pedal lever. So I guess they wear out there too. Not a peep out of the new cleats.

The noise started as an annoying creak, but in the last few days evolved into something that sounded like a bad BB or pedal bearing.

Sorry for the long story, but my revelation just shows how many bike noises don't come from the "obvious" places. Luckily I didn't spend the time ripping apart my BB before replacing the cleats.

I usually put a bit of grease on my BB cups when I install. Helps with installation and also allows proper torquing of the cups (in my experience). Have never had any problems with this.