New chain is "jumping" on freewheel. Didn't have this problem with old chain. This bike is singlespeed made from common mtb. Does anybody know what this could be?
Thanks for your time
by CYMON_
New chain is "jumping" on freewheel. Didn't have this problem with old chain. This bike is singlespeed made from common mtb. Does anybody know what this could be?
Thanks for your time
by CYMON_
8 Comments
~~How long has it been since you changed the chain?~~
Not an expert, but it’s either a bad chain or you need a new cog.
If you let the old chain wear out significantly, it damages the cog so the cog fits the the worn chain. When you put on a new chain, the cog no longer fits because it has been worn to accept the old chain.
Edit: I agree with other commenters, wrong chain.
Or you bought the wrong chain.
Got a picture of the packaging and what is the size of your chain rings front and rear?
We need to know more information to help.
Chain width. The new chain is too narrow for the cog – seems to be a 3/32″ chain and the cog is made for 1/8″ chains.
Correctly sized new chain jumping on old cogs mean old cogs are worn and need replacing.
The problem is crystal clear here. You need 1/8 chain not 3/32. The problem is not the length (even though it may look so) but the width.
KMC Z1 for example or any other single-speed one.
you do not use a road pitch chain on a track pitch cog…….
Clearly wrong chain, 3/32 on 1/8 sprocket. BUT before you do anything, how is the chainring situation? Because if you got sprocket and chainring mismatch, you wont be able use any chain haha till you ensure they are both of the same standard
Btw 3/32 is clearly more common, i myself running a single speed converted, and hv408 and z6 kmc chains are REALLY GOOD. I ran like 2000km on hv408 before it even reached 0.50 on the wear meter! (I use candle wax btw, refresh every 200 km still the exact same wax from 2024). So IF your chainring is 3/32, i would say get a sprocket thats 3/32 as well.