new chain + old cog = mysterious click click click + me feeling like a moron.

you can close this once everyone is enlightened.

what kind of chain did you have and what kind of chain do you have now. Some chains allow more play when your chainline isn't perfect. Like a SRAM chain has more leeway than say a Izumi.

Perhaps your chainline wasn't good in the first place and a new stiff chain is yelling at you.

unless the cog is damaged in some way worn teeth broken teeth what not there should be no issue it could also be you are running the wrong sized chain and or a chainline issue

check the chainline again, and see if you can flip the bike turn the crank with your hands and pinpoint when its clicking, if its regular, irregular, etc. i had this confusion with a bike build a couple weeks ago, looked at it and found that the chain was hoppin up on the inner link and clicking off, only in a couple places where theres that random bend in the chain a bit.

he doesn't need advice. he needs mockery. the new iro is good LOOKING at least.

ok new tip, lattanzio: i'm going to wrap my chain around your neck and ram my cog into your face.

answers: the teeth on the old cog were super worn. my lbs guy showed me the play on the cog.

sounds sexy.

Yep running a new chain on an old cog can be very hairy. The cog will have "adapted" iteslf to an old stretched out chain, but once you put the new one on all kinds of funny stuff will happen. Recently i replaced the chain on my geared bike and the chain would slip off the chainring in front when I really torqued on the cranks, basically at the worst possible times. So I replaced the chainrings and had no problems after that. Ultimately, the solution to this problem is to replace chains more often so that stretch can't cause rapid sprocket wear.

mander if you replace your chain of maintain your drive train properly and regularly you won't have any issues stop repeating sheldon

danish watch out lattanzio is getting broody