4" fat tire JACKSHAFT FOR LEFT SIDE Single Speed Drive.   Note the 3" requirement!

Fits 28mm dia. steel seat post

This Seat Post Jackshaft Bracket is for left side single speed drive.   

It is for a mounting a 2 stroke China Doll engine inline Mid-frame on a Micargi Slugo 4" single speed Fat Tire 26" Cruiser Bike.    THEREFORE, THE ENGINE IS NOT Offset to the left.  It retains middle of frame position via jackshaft drive! 

Don't have a Micargi Slugo Bike?  No problem, we can sell you one dropped shipped from MiCargi Calif. warehouse.  

Our SeatPost Jackshaft fits a 28mm dia. steel seat post that is 3" away from the 4" rear tire.       

We 100% guarantee to fit the 26" Micargi Slugo 4" tire bike frame!

• FYI:  We will only make 35 of these CNC SEATPOST JACKSHAFT KITS to test the market.  

Nov 2024 First time offered:     

• USA Machine shop made.   Repeat  > NOT MADE IN CHINA.    Made in Oklahoma by me and the 7D CNC machine shop in Boswell OK!  
  

• Especially designed for Micargi Slugo 26" 4" tire bikes that have 3" clearance between seat post and tire.  However, may fit other brand bikes but must have the said 3" tire clearance and 28 to 28.5mm dia. steel seatpost. 

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

• NOTE:  4" tire Slugo Bikes can be ordered from us and yes, they have the required 3" clearance and 28mm dia. seat post. 

• By using our CNC solid billet jackshaft bracket the 2-stroke engine remains in the 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 have an engine on a 4" tire bike was to offset it to the left.  Problem Solved!

• The GruBee Seatpost Jackshaft Bracket allows the engine drive chain to drive an inboard    and outboard sprocket allowing chain clearance to go on past the 4" tire and drive the rear wheel on the left side.   Problem solved! 

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

• Heads up:  We include a CNC solid spacer block and 120mm long M8 double threaded Studs that pushes the engine forward to the bike's downtube 

• BOM:   BUILD OF MATERIALS

• 1.  2 pcs. Seat post mounting bracket and hardware. 

• 2.  Cam lock cylinder and hardware   

• 3.  Stainless Steel Shaft and (2) 5x5x20 keys. 

• 4.  Choice (2) 10T & 9T or (2) 10T sprockets with set screws.  Tell us your choice in note to seller or we will send 10T & 9T as default. 

• 5.  (3)15mm ID Spacer washers.   

• 6.  Dual CNC solid spacer blocks and (2) M8-1.25x120 threaded studs. 

• Customer must make their own sheet metal chain guard and obtain the required 415 drive chain.   ( Chain and chain guard are Not Included. )   

  
  

• Due to high cost $125 / hour CNC SHOP USA labor rate we will only make 35 of these Beautiful CNC SEATPOST JACKSHAFT KITS to test the market before taking the project to Riceland.   

• OORAH! We now have received our multi-speed right hand chain drive Kits.  yes, the kit that chain drives down to the right-side bottom hole with an inboard freewheel sprocket driving a 1/2x3/32" chain to a Multi Speed rear axle.    For easy engine starting a drill start SkyHawk 85Avenger or a drill start Gt5A-ES 69 engine is a requirement. Pedal starting is very labor some.