Jackshaft problems!

Terminator84

New Member
Nov 3, 2019
28
5
3
19
Hello i recently bought this kit i put it all right here but after i started to try it after a few hundred meters however the middle chain from the small gear wheel to the pedal fell i went home i reconfigured the tensioner however i still don't know what to do!
 

5-7HEAVEN

Well-Known Member
Aug 2, 2008
2,505
136
63
I'm guessing your chain and sprockets are misaligned. Try your best to align them. On my old bike, my chain fell off often, towards the inside. If it snagged on the mounting nuts and bolts, the chain would snap. I used SBP's Jump Stop, which seemed to help some.

On my next bike, I'm making a "sheet metal sandwich", using thin-gauge stainless steel larger in diameter than my 24-tooth drive sprocket. That should keep the chain from jumping off.

Orrr, you could install a larger sprocket towards the inside of your 24t sprocket, to act as a barrier.

Good luck. I know very well, how frustrating this problem can be. Try your alignment first, then the Jump-Stop.
 

Tom from Rubicon

Well-Known Member
Apr 4, 2016
1,135
2,084
113
Rubicon, Wisconsin
Hello i recently bought this kit i put it all right here but after i started to try it after a few hundred meters however the middle chain from the small gear wheel to the pedal fell i went home i reconfigured the tensioner however i still don't know what to do!
Chain line accuracy is everything when building a drivetrain. The best straightedge you can get will make your life easier matching sprocket geometry. Rack of eye is not something that works in our applications. My current build uses a jack shaft of sorts call a Reduction Drive by Sportsman Flyer and ate some sprockets because I assumed chain line was a no brainer. It isn't. Use the best straight edge you can get clamped to the receiving sprocket. Most likely you will be able it right soon.
Tom .