Help please. 140 Spoke Sprocket issue

H

Harp

New Member
I have a 140 spoke chopper bike. I have installed motors on mountian bikes before
however, Never on a 140 spoke chopper.
I really want to keep the rims because it put a unique look to the bike itself.
I can't really get started until I figure out how I would install
the rear Sprocket. Any Ideas/pictures would be a help.
I have included pictures.
Thank you.
-Harp
 

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If your serious on this , you could easily have a professional welder just weld a custom sprocket into place for you , thus eliminating all the bolts
 
I would like it if I could, but I saw a stinger with a 36 spoke fat tire.
I might just slap that on. If I can find one.
Welding the sprocket is a good idea though.
...Now if I can somehow re route the pedal chain.
due to the right side (were clutch pads are) of the motor hits the chain =(
 
Not sure I would weld it cause you could trash the wheel hub unless you don't put much heat in it but then the weld might be questionable... You could find a larger piece of rubber, steel flat stock, and re drill the holes further out on the sprocket while still retaining the original mounting design (two rubber spacers and several steel plates just larger...)

Got a chance to draw up what i was tryin to say:
 

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This is gonna be a challenge. It's obvious that the standard method used to install a sprocket is not going to work well, if at all. No matter which way you go I'm afraid you're going to loose some of the beautiful look of that wheel. I feel that welding to the hub is out of the question. You'll stand a good chance of distroying the hub and bearing race area. If it were me I'd probably fabricate a clam-shell style of adapter that would clamp around the rear hub and use only 3 of the nine holes in the standard sprocket. Even with this method I see where you're going to have some interference with the spokes. The only other method I would suggest is to fabricate an adapter that would go outside of the spoke line but without actually being able to study the wheel up close I can't give you an idea of how that adapter would attach or look. Good luck, keep us posted...Is that a Firebike? Looks great!
Tom
 
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I appreciate all the posts and tips I've gotten when a short span time.
I wanted to get this up and running withing 3 weeks. I'm not so sure if thats
going to happen =( I Haven't built a chopper like this before
and hoping to learn a lot during the install.
My welder had been stolen a few days ago which cost me $800,
which means I cannot make welds anymore, which ALSO just
makes this project that much harder.

I really apreciate all the supporfrom all you people.
From giving ideas to showing visuals.
Once again thank you.

Jackshaft I believe would work but I don't think I could fabricate one myself.

:-||
 
the bolts will fit threw those spokes,just slide and wiggle them in.
and raise or offset the engine to clear the chain.
many people with that bike did it before.
 
I also realized the coaster break arm is in the way.
I've read a form on here on how to overcome that obstacle
before but I can't find it.
 
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