I picked up a Schwinn Madison last week and im getting some clunking from the rear end of the bike. It only clunks when i pedal and the clunking doesnt generally get worse with speed but gets worse with increases in load(pedaling up hills). Is this a chain tension issue? Lubrication? Any ideas would be greatly appreciated!
Sounds like the chain tension is too tight.
Don’t be afraid to loosen the chain somewhat- it doesn’t look as ‘cool’ but the drivetrain will perform a lot better. You’d be surprised how loose you can run a chain before it slips off.
Another potential cause for clunking noises is a new rear sprocket/new chain or mixing new and old.