Chainline looks pretty straight from what I see but I look at it from the back to see if its straight in line. I know Sheldon brown will say a QR is okay for single speed when tight but my experience has always been they slip no matter how tight I set them. Sometimes a little sometimes a lot. Also depends on the thickness of the dropouts and how much axel extends out of the hub endcaps/cone+locknuts how well the QR clamps. That’s my biggest suspicion to why its slipping and dropping your chain. Otherwise make sure there are no bent or miss aligned teeth on the cog or chain ring and no twisted links in the chain.
Fix: Bolt on wheels or if the hubs loose ball then replace the axel with a threaded one sufficiently long to run axel nuts.
[deleted] on
Looks like a chain line issue from pic 3. Can’t quite tell how your chain tension is, but seeing your chainring on the outside of the crank spider in pic 2 + your chain line in pic 3 is pretty severely angled, if your chainring will clear the frame being mounted on the inside of the spider looks like it’ll straighten your chain line nicely and with sufficient tension, chain drop should be 0
Raymo853 on
Might be frame flex leading to it dropping
starnut_propaganda on
Chain line is way off, try putting the chainring on the inside of the crank and reposition your cog in your cassette.
Patina_dk on
Are chain and sprocket the same width? 1/8″ chain on a 3/32″ sprocket usually works well, but sometimes it doesn’t.
How tight is super tight?
meehaja on
That picture is confusing my brain! Rotate dammit! Rotate!
Scotterdog on
Noob question here. Could a chain be bent (sideways) somewhere along it’s circumference perhaps from a fall?
7 Comments
Chainline looks pretty straight from what I see but I look at it from the back to see if its straight in line. I know Sheldon brown will say a QR is okay for single speed when tight but my experience has always been they slip no matter how tight I set them. Sometimes a little sometimes a lot. Also depends on the thickness of the dropouts and how much axel extends out of the hub endcaps/cone+locknuts how well the QR clamps. That’s my biggest suspicion to why its slipping and dropping your chain. Otherwise make sure there are no bent or miss aligned teeth on the cog or chain ring and no twisted links in the chain.
Fix: Bolt on wheels or if the hubs loose ball then replace the axel with a threaded one sufficiently long to run axel nuts.
Looks like a chain line issue from pic 3. Can’t quite tell how your chain tension is, but seeing your chainring on the outside of the crank spider in pic 2 + your chain line in pic 3 is pretty severely angled, if your chainring will clear the frame being mounted on the inside of the spider looks like it’ll straighten your chain line nicely and with sufficient tension, chain drop should be 0
Might be frame flex leading to it dropping
Chain line is way off, try putting the chainring on the inside of the crank and reposition your cog in your cassette.
Are chain and sprocket the same width? 1/8″ chain on a 3/32″ sprocket usually works well, but sometimes it doesn’t.
How tight is super tight?
That picture is confusing my brain! Rotate dammit! Rotate!
Noob question here. Could a chain be bent (sideways) somewhere along it’s circumference perhaps from a fall?