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Strange chainline noise on the Paramount ...(3 posts)

Strange chainline noise on the Paramount ...Humma Hah
Apr 13, 2003 7:41 PM
... At first I thought I was imagining it, but it persisted. Every two revolutions of the cranks this same noise repeated, a very soft sound, nothing serious, just curious.

The drivetrain is presently set up as 48T front, with a fresh track chainring (1/8"), driving an 18T freewheel in the rear. That's 8 revs of the rear wheel for each 3 revs of the chainring, and it doesn't explain the noise.

Then I noticed that the chain itself is 96 links, exactly two revolutions of the crank for each transit of the chain. Being as it was what I had in the drawer, the chain happens to be a brand-new SRAM PC-1 cruiser chain, not the type I usually use, but a slightly lower grade that is not finished quite as well. I suspect the sound is coming from slight irregularities in the chain, including the passage of the master link.

The sound is quite distinctive:

"Chitty-chitty bang bang chitty-chitty bang bang"
Take out the master linkbigrider
Apr 14, 2003 3:55 AM
One idea is to take out the master link just to see if that is the culprit. That bike is too pretty to "chew with its mouth open"
Take out the master linkenginebad
Apr 14, 2003 6:06 AM
or flip the masterlink around so that its bulkier side is on the inside(frame side) of the chain. on smaller mountain bike frames, and bmx frames, ive run into having the master link rub the inside of the seatstay. i couldnt see that happening on a road frame though.