help me with hubs!!!

[pubesandwich]

hey im about to build a kustom w/ a gas motor, and i want the thing to be FAST...
my idea is to use a shimano nexus hub, but i want to be able to reverse it to lhd. that way i can SHIFT and reach much higher speeds... i know if i just take a hub and flip it, it wont engage. plus, i need to retain rhd pedaling capability to be street legal...
i searched eveywhere, and nobody seems to make an lhd shifting hub... i know i would have to have a rear gear custom made to fit the hub, as the arbor would be different.
anyone got any machining/welding advice for me?

 

[MarksA-C]

So your trying to make a motorized bike with the ability to shift?
If you are are going with a Chinese 2 cycle engine kit, get a shift kit from http://sickbikeparts.com/

 

[CCR]

sounds like it would be a lot easier to run a jackshaft - kinda like what larry did on his build off bike, just keep the pedal sprocket on the right like normal and double up the sprockets on the right side of the jackshaft with a freewheel going to the crank sprocket.

viewtopic.php?f=25&t=9792&p=99358#p99358

 

[AussieJester]

You can buy left hand threaded freewheels they are called South Paw frewheels, you can also buy adapters that bolt onto the disk brake
mounting holes on the hubs that the Southpaw freewheel will screw onto. TIP: if you want to make your own you can use a standard bottom bracket
bearing race, it is the correct left hand thread for rear southpaw sprocket, weld an adapter plate to bolt to the disk mount on the hub and you have a lhd
ready to go. Use a jackshaft assemble to transfer you motor driveline to the right hand side and have your manual pedal on the left...Done

KiM

p.s if you dont follow this check my worklog in a day or two i will be doing the exact thing on my rear 3 speed hub .. I have all the components just need to fabricate the adapter.

 

[B607]

If you want to shift gears and go fast, why don't you save yourself the trouble and just buy a motorcycle? :roll: Gary

 

[AussieJester]

Maybe because motorcycles require a license registration and insurance, on top of that
you have higher runnings costs.

KiM

 

[FunkyStickman]

You could go to http://www.sickbikeparts.com/ and convert the engine to RHD to use suspension and/or gears... it involves replacing the crank, and isn't that cheap, but check it out.

 

[user 135]

I dont' think the Nexus hubs would be strong enough. You might try a Nuvinci Hub as they can take more torque.

 

[AussieJester]

Actually 3 speed hubs have proven heaps strong enough for the HT engines (49cc china motors) they only output 750watts which the hubs can handle no probs, they dont have enough torque to pull the skin off custard.
The e-bikers with big torque do go for the Nuvinci Hub the electrics have the rep for spitting out 3 speeds at will ... Why i am even trying to use one i dont know hahaha..

KiM

p.s i setup lefthand drive on my project yesterday if you wish to see how it can be done DIY stylin

http://members.ii.net/~aussiejester/ind ... dapter.jpg