what is a Jackshaft?

[Antonio3]

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

 

[ezrider]

Isn't that some kind of Rube Goldberg contraption ??

_

 

[JerboaJohn]

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

 

[gary55]

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[darwin]

I knew Jack Shaft, he's a nice guy.

 

[gary55]

Came from a long lineage of miners.

 

[Antonio3]

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?

 

[Deleted member 26224]

Check this out

 

[Antonio3]

Check this out

View attachment 86924

The smiley face left eye resembles the number 9
Before the number 9 there is number 8
Number 8 sideways is the infinity sign
𝗗𝗜𝗗 𝗜 𝗨𝗡𝗖𝗢𝗩𝗘𝗥 𝗧𝗛𝗘 𝗠𝗘𝗔𝗡𝗜𝗡𝗚 𝗢𝗙 𝗟𝗜𝗙𝗘 𝗔𝗡𝗗 𝗨𝗡𝗜𝗩𝗘𝗥𝗦𝗘?

 

[BIG BOBBY]

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

jackshaft: a heavy, complicated, sorta expensive way to produce chain drag and extra headaches. I,..for one,.have zero interest in them. --others love them to death.