what is a Jackshaft?

Antonio3

New Member
Joined
Apr 6, 2019
Messages
15
What is a jackshaft? i heard it was a mod but what does it do and how it works, also if its worth getting 1
 


JerboaJohn

Well-Known Member
Joined
Jul 29, 2018
Messages
1,234
Hi Antonio,, a jackshaft is used to relocate the drive force from left to right side, to offset the chain to help align with the rear, and/or to further reduce the drive ratio (as in use with 4 stroke engines)

examples: from the engine, there is another geared shaft to put the drive to the pedal sprocket on the right side, so you can use the bike gears ("shift kit")
4stroke: from engine, a chain or belt goes to a bearing supported shaft with 2 gears, then another chain goes from there to the rear sprocket, same side. unlike a 2 stroke China engine, 4 strokes need further gear reduction or else you would need an 80-100 tooth sprocket lol
wide engine: chain to jackshaft, then a 2nd chain closer to the frame to align with the back sprocket.

do you need one? depends on your engine of choice. want to shift your motor gears? (2 stroke/ebike) SickBikeParts has the best kit
 

Antonio3

New Member
Joined
Apr 6, 2019
Messages
15
i al
Hi Antonio,, a jackshaft is used to relocate the drive force from left to right side, to offset the chain to help align with the rear, and/or to further reduce the drive ratio (as in use with 4 stroke engines)

examples: from the engine, there is another geared shaft to put the drive to the pedal sprocket on the right side, so you can use the bike gears ("shift kit")
4stroke: from engine, a chain or belt goes to a bearing supported shaft with 2 gears, then another chain goes from there to the rear sprocket, same side. unlike a 2 stroke China engine, 4 strokes need further gear reduction or else you would need an 80-100 tooth sprocket lol
wide engine: chain to jackshaft, then a 2nd chain closer to the frame to align with the back sprocket.

do you need one? depends on your engine of choice. want to shift your motor gears? (2 stroke/ebike) SickBikeParts has the best kit
i also hear they were quite dangerous to use,some people said that their chain broke alot of the time injuring themselves,is that true?
 

Antonio3

New Member
Joined
Apr 6, 2019
Messages
15
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