RIGHT SIDE > MULTI-SPEED seat post jackshaft kit.

$189.95

In Stock now! 15 kits left in stock then no more till next year.

NOTE: BIG PLUS! The rear bike wheel need not be removed to fit this multi-speed jackshaft drive as would be required with single speed left side drive.

NOTE: Fits 32mm aluminum seat post, with shims, will also fit down to 28mm dia. steel seat post. Order shims separately here-in

Using this Multi Speed Shift Kit is just like shifting a motorcycle.

Works with Shimano 6 or 7 speed cluster or better yet with a 5-speed HD hub axle that allows shifting while not moving, ie: at Stop light.

OPERATION: The right-side Jackshaft chain drives down to the right-side freewheel pedal sprocket attached to a 1/2x3/32" chain sprocket that drives the bike's Multi Speed rear axle. Due to the difficulty of pedal starting a rope pull or drill start Gt5A-ES or a SkyHawk Avenger-ES > 2 stroke engine is a basic requirement. If you think otherwise that is up2U.

Salient Feature: This kit allows mounting our 2 stroke engines in center-line Mid-Frame.

THEREFORE, THE ENGINE IS NOT Offset, it Sets in the middle frame where it ought to be!

Got a steel frame bike with 28mm dia. steel seat post? No problem just order separately the special JS shim kit that spaces the 32mm dia. bracket clamp down to 28mm.

WARNING: Jackshaft 2 pcs. Bracket must have 3" minimum clearance from behind the seat post to the 4" rear tire.

We 100% guarantee to fit the 26" Micargi Slugo 4" tire bike frame if a 28mm CNC solid spacer kit is ordered with this jackshaft kit! ( purchase separately ) Got a different bike?, that is up 2U.

FYI: We only made 30 of these CNC SEATPOST Multi-Speed JACKSHAFT KITS to test the multi-speed shift kit market.
NOTE: Installation is not for a faint-hearted non-mechanically challenged person. Mechanical aptitude and small engine experience is necessary. Sorry, We had no time to film an instruction video. If someone wants to make one we will be glad to post it with your name for others to go by.
Our kit with 2mm thick halfmoon shims was Especially designed for the Micargi Slugo 26" 4" tire bike that has 3" clearance between seat post and tire. However, it may fit other brand bikes but must have the said 3" tire clearance and a 32 to 28mm dia. seat post.
To avoid a return for non-fit please measure your bike before buying to avoid a 25% restocking charge.
By using our CNC solid billet jackshaft bracket your 2-stroke engine remains in a middle frame position same as would be in a standard 2"-inch tire bike thus giving best balance and professional look. Problem solved!
Up until now the only way to fit an engine on a 4" tire bike was to offset the engine to the left. Problem Solved!
Heads up! Up until now the only way to move the engine forward for attachment to a Cruiser bike S downtube was to use (2) rear stock cast engine blocks. Included in this kit is a SOLID billet CNC cut spacer block and 2 long M8 studs. PROBLEM SOLVED
OPERATION: The Multi-Speed Seat Post Jackshaft Bracket allows the engine to drive a left side 17T sprocket and on the right side is your choice of a 9T or 10T sprocket driving a chain to a bottom bracket sprocket with freewheel going back to the multi-speed rear bike wheel. Problem solved!
The problem of how to tighten the engine chain is solved by using our Cam Lock Hub, same idea as used in our 4G 4 cycle transmission. Problem solved!
NOTE: If you have a 28mm dia. steel seat post you must order a 4mm thick spacer kit sold separately here-in.
Bill OF MATERIALS see pictures
Customer must make their own DIY sheet metal right side chain guard and obtain the required 415 drive chains. ( Therefore, Chains and chain guard are Not Included. )
NOTE: BIG PLUS! The rear bike wheel need NOT be removed to fit our jackshaft multi-speed shift kit.
How fast can you go with Multi-Speed shift kit? That depends on your 9 or 10T jackshaft drive sprocket selection and rear wheel drive teeth ratios, head winds and weight of driver with terrain conditions, and aftermarket engine modifications. So please don't ask due to too many variables!

RIGHT SIDE > MULTI-SPEED seat post jackshaft kit.

GruBee Inc

In Stock now! 15 kits left in stock then no more till next year.

NOTE: BIG PLUS! The rear bike wheel need not be removed to fit this multi-speed jackshaft drive as would be required with single speed left side drive.

NOTE: Fits 32mm aluminum seat post, with shims, will also fit down to 28mm dia. steel seat post. Order shims separately here-in

Using this Multi Speed Shift Kit is just like shifting a motorcycle.

Works with Shimano 6 or 7 speed cluster or better yet with a 5-speed HD hub axle that allows shifting while not moving, ie: at Stop light.

Salient Feature: This kit allows mounting our 2 stroke engines in center-line Mid-Frame.

THEREFORE, THE ENGINE IS NOT Offset, it Sets in the middle frame where it ought to be!

Got a steel frame bike with 28mm dia. steel seat post? No problem just order separately the special JS shim kit that spaces the 32mm dia. bracket clamp down to 28mm.

WARNING: Jackshaft 2 pcs. Bracket must have 3" minimum clearance from behind the seat post to the 4" rear tire.

We 100% guarantee to fit the 26" Micargi Slugo 4" tire bike frame if a 28mm CNC solid spacer kit is ordered with this jackshaft kit! ( purchase separately ) Got a different bike?, that is up 2U.

FYI: We only made 30 of these CNC SEATPOST Multi-Speed JACKSHAFT KITS to test the multi-speed shift kit market.

NOTE: Installation is not for a faint-hearted non-mechanically challenged person. Mechanical aptitude and small engine experience is necessary. Sorry, We had no time to film an instruction video. If someone wants to make one we will be glad to post it with your name for others to go by.

Our kit with 2mm thick halfmoon shims was Especially designed for the Micargi Slugo 26" 4" tire bike that has 3" clearance between seat post and tire. However, it may fit other brand bikes but must have the said 3" tire clearance and a 32 to 28mm dia. seat post.

To avoid a return for non-fit please measure your bike before buying to avoid a 25% restocking charge.

By using our CNC solid billet jackshaft bracket your 2-stroke engine remains in a middle frame position same as would be in a standard 2"-inch tire bike thus giving best balance and professional look. Problem solved!

Up until now the only way to fit an engine on a 4" tire bike was to offset the engine to the left. Problem Solved!

Heads up! Up until now the only way to move the engine forward for attachment to a Cruiser bike S downtube was to use (2) rear stock cast engine blocks. Included in this kit is a SOLID billet CNC cut spacer block and 2 long M8 studs. PROBLEM SOLVED

OPERATION: The Multi-Speed Seat Post Jackshaft Bracket allows the engine to drive a left side 17T sprocket and on the right side is your choice of a 9T or 10T sprocket driving a chain to a bottom bracket sprocket with freewheel going back to the multi-speed rear bike wheel. Problem solved!

The problem of how to tighten the engine chain is solved by using our Cam Lock Hub, same idea as used in our 4G 4 cycle transmission. Problem solved!

NOTE: If you have a 28mm dia. steel seat post you must order a 4mm thick spacer kit sold separately here-in.

Bill OF MATERIALS see pictures

Customer must make their own DIY sheet metal right side chain guard and obtain the required 415 drive chains. ( Therefore, Chains and chain guard are Not Included. )

NOTE: BIG PLUS! The rear bike wheel need NOT be removed to fit our jackshaft multi-speed shift kit.

How fast can you go with Multi-Speed shift kit? That depends on your 9 or 10T jackshaft drive sprocket selection and rear wheel drive teeth ratios, head winds and weight of driver with terrain conditions, and aftermarket engine modifications. So please don't ask due to too many variables!

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