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Old 10-07-08, 01:16 PM   #1
neilfein
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Curve drivetrain a-clickin' and a-scrapin'

For the last few weeks, my Curve D3 has been making a muted clicking noise when pedaling, always when the cranks are in the same position. Sounds like a problem with the bottom bracket or with the chainring, I thought. In case i was wrong, I scrubbed the gain and the gears as best as I could without taking the rear wheel off. (It never hurts to clean a bike.)

The noise has changed. Now it's intermittent, and the clicking is louder but sounds likes something's scraping something else. Again, not all the time and not all that loud. The bike is under warranty, but it's a pain to get it to the shop I bought it at.

Pretty weird. Anyone seen this? Thanks!
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Old 10-07-08, 01:49 PM   #2
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not that the wheel is crocked and the chain is rubbing on the frame isnt it ... ?

I have literally taken complete drivetrains apart in the 70 ties to find the clicking sound..... sure pedals and BB sets were mostly the culprit, but loose saddles , stems and what else not have been declared the culprit at times....
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Old 10-07-08, 02:14 PM   #3
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Originally Posted by brakemeister View Post
not that the wheel is crocked and the chain is rubbing on the frame isnt it ... ?

I have literally taken complete drivetrains apart in the 70 ties to find the clicking sound..... sure pedals and BB sets were mostly the culprit, but loose saddles , stems and what else not have been declared the culprit at times....
I just walked over and flipped the bike upside down. The rim looks straight, although I did a lousy job seating the tire after the last flat.

The chain clears the frame, but it's a close thing in the back. The noise is coming from the front, I think.
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Old 10-07-08, 02:33 PM   #4
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Why not just get a LBS to slide a new sealed BB in for you? There not expensive at all (20 or so?). Even if it doesn't solve the problem, its a upgrade that needs doing at some point.

Ps, if you have a sprung seat (Brooks or similiar) they can make a simliar noise. Main thing is to check if there is any movement in BB or to see if it feels 'notchy'.

Otherwise, oil all moving parts, clean seat post with white spirit, pull the shim out and put a bit of grease around it before pushing it back in. Most of the time this will do the trick
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Old 10-07-08, 03:31 PM   #5
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Dry pedal bearing?
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Old 10-07-08, 05:05 PM   #6
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On my vitesse I found my frame hinge was creaking in a click-sort of of way regularly in sync with the crank rotation: had me stumped for a whilte. So yeah, can come from anywhere I guess.
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Old 10-07-08, 06:48 PM   #7
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Okay, I figured out what some of the problem is. The frame quick-release latch is missing. It must have fallen out from road vibrations. (chagzuki, you weren't far off.) I'm frankly shocked the frame hasn't folded up on me in traffic. Seems to me there's a pretty serious issue. I essentially lose use of the bike until I can get the shop to order the part, and Dahon takes forever to get them the parts (or they take forever to place the order, maybe).

The original clicking noise, however, is still there. It happens when the right crank is around 45 degrees CW of noon.

Joose, what exactly will a new BB get me, as opposed to getting the warranty replacement?
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Old 10-08-08, 02:06 AM   #8
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neilfein

Firstly, I'm glad you found the problem, it coulda been painful!

The BB suggestion comes from if it had been the BB causing the problem, rather than trying to fix it a sealed unit would be better (and I think should of been fitted in the first place). Warranty's are good but like you have said, Dahon take a while get sort things out. If you have other bikes thats not a problem but if it's your only one, a quick solution is better in my book
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