Crank set w/ motor to crank to rear sprocket free wheel on the crank

[Jason Only 13]

I have seen it on other builds and I want it for my build. Chain from motor to crank on left side and chain from crank to rear sprocket with free wheel on the crank. Where can I find this? Who makes them? Do they have a name?

 

[Harold_B]

That last picture isn't quite what you were looking for but is much more available and robust. Sportsman Flyer offers that crank setup along with a hub mount for the chain sprocket at a quality of manufacting level that is amazing.
http://sportsmanflyer.com/product-category/parts/page/3/

 

[Mr. Phikset]

Too bad they chose to make it exclusive to those buying and making their bikes, they won't sell it separately any more. Anyone know of any other makers of the crank shaft assemblies?

 

[Harold_B]

I wasn't aware of that. Bummer. Here's another good place to start a search:
http://motorbicycling.com/showthread.php?t=22706

 

[MotoMagz]

It's actually pretty simple ..lol the sprocket coming of the clutch can be welded to the small sprocket going back to drive .Then those two connected sprockets just spin on pedal crankshaft with no keys or set screws. You would need collars to hold it in line. Now you can pedal bike with no engine drag. Now if you want to kickstart you need a oneway bearing of some sort. I have seen it done with a manual clutch.

 

[mikeeebikey]

It's called a "jack shaft," and most motorized bike engine stores carry theirs. BBR has one that is acceptable...
Search, "motorized bike jack shaft kit."

 

[MotoMagz]

He was (2016) talking looking for a gear reduction hub

 

[Hukah]

@mikeeebikey
What bike is that in your avatar(?)?

 

[mikeeebikey]

Dyno enduro 7

@mikeeebikey
What bike is that in your avatar(?)?

 

[Hukah]

Dyno enduro 7

Thx, that's sharp.

 

[Chainmaker2]

Perhaps this helps seeing one..

 

[Hukah]

Perhaps this helps seeing one..

I looked it up. That's a fairly expensive bike.
I am looking now for one of these hubs, or a three speed , for my '48 hiawatha raodster