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Finally found 'popcorn' noise from my bike(7 posts)

Finally found 'popcorn' noise from my bikeHedgehog
Sep 21, 2003 6:24 PM
I've been fighting with a noise from the drivetrain of my bike (Cannondale R800) ever since I got it, and it seems that I've finally found it. It only appeared when I was really cranking on it.

The noise seems to go away when I put some grease on the dropouts where the qr meets them, is this a common source of noise?

Well maybe I can save someone else some hassle.
re: Finally found 'popcorn' noise from my bikealiensporebomb
Sep 22, 2003 2:45 AM

On my own bike I occasionally hear that sound but I figured a
couple of things:

Only really happens while pedaling.
Only really happens NOT while cranking super hard.
Does not happen while coasting.

Pedals, drivetrain, bottom bracket/crank/derailleur, seatpost?? frame?
congrats - you found the #1 cause of mystery frame noises (nm)!philippec
Sep 22, 2003 4:48 AM
OK, diagnose this onePaulCL
Sep 22, 2003 6:17 AM
Aegis carbon frame. I hear a loud noise as I stand up to crank. Almost always hear the noise on the downstroke of the left pedal. The noise "seems" to come from the headtube, but I know that is highly unlikely. It sounds as if something is inside the headtube knocking on the CF.

I've tightened bolts, looked for cracks, lubed, etc...but its' still there. It sounds really bad.

I'll try the greasing of the QR's. Any other suggestions?
tighten pedals, crank bolts and might lube bb (nm)funknuggets
Sep 22, 2003 6:44 AM
OK, diagnose this oneKEN2
Sep 22, 2003 8:53 AM
#1 cause of once-per-revolution, always-in-the-same-spot noises is BB. Tighten it, or remove and grease threads, maybe wrap with teflon tape, then retighten to spec.
Sep 22, 2003 4:28 PM
I had an annoying sound I thought was the BB, every time the right foot pedalled on the down-stroke. I didn't believe it was the Phil Wood BB - they are supposed to be indestructible & maintenance-free. I tightened the BB cups & crank bolts anyway, but that wasn't the problem - it was the chainring bolts all along!
Plus, one of the washers on the hidden crank spider (record cranks) was on backwards, so it couldn't tighten properly.

Ummm.... you also might want to check your left pedal cleat is tightened properly. Just a thought.