Two gears are clunking / clicking when pedaling

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Two gears are clunking / clicking when pedaling
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Posted: Jul 11, 2019 at 22:31 Quote
I'm having an issue that I can't figure out and I was hoping I could get some advice. Two gears (8th and 9th gear) are making a clunking / clicking sound roughly once (possibly twice) per revolution. The drive train is clean and lubed. All the other gears are quiet and there are no problems shifting. I thought that maybe a tooth was bent on those two sprockets but it doesn't look like it with the naked eye and I don't know how else to verify that. I could pull the cassette off if necessary, but I haven't done that.

The guide wheel on the derailleur is perfectly in line with the sprockets. Just for the heck of it I tried tightening / loosening the barrel adjuster on the shifter but, as expected, that made the chain want to shift to other gears so I put it back where it was initially. The chain is still within spec, per a Park Tool CC-3.2 chain wear indicator.

I *think* it started when a stick flew up into my chain during a ride and got stuck in the chain, but I'm not positive about that.

Drive train is: SRAM GX Eagle rear derailleur, shifters, and chain. SRAM XG-1275 Eagle cassette (12 speed)

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