Sprocket Help

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SHARKBITEATTACK
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Sprocket Help

Will this freewheel www.electricscooterparts.com/sprockets.html#fw work with this sprocket? www.mfgsupply.com/m/c/4-469.html?id=t4qRHyTX
and would it match up to a threaded bicycle hub?

Thanks
-Jon

Sturdly
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Re: Sprocket Help

The center hole of the sprocket has a 2 inch center hole, the freewheel requires a 2and 1/8" center hole. The sprocket is also for #35 chain, bike chains are often #25. Not sure if that makes any difference in your application. It should screw on the right side or the left and right on a flip flop hub. But on a flip flop it will not freewheel the proper direction to drive from the left.

It's not a bolt together. Some mod required but I'm sure it could be drilled to fit. Not sure about the 4 bolt hole spacing matching up either. I'd measure mine but it is a five hole version.

Sturdly
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Re: Sprocket Help

This one should be a direct bolt on 60T #35 chain sprocket for the freewheel in question.


Click here for Sprocket data

SHARKBITEATTACK
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Re: Sprocket Help

Darn, I already ordered the 2 inch sprocket, I'll just have to bore it out with a grinder, hacksaw and whatever tools I find laying around.

My real concern is about the freewheel itself. I've searched the internet and it is the the only freewheel mount that I could find.

http://evchallenge.swantafe.wa.edu.au/making.asp
http://mcs.une.edu.au/~ashley/ebike/index.html

here's 2 guys that went through alot of trouble to make a custom freewheel, and if this freewheel mount does what it should it would save me alot of time and money

Sturdly
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Re: Sprocket Help

There is always the option of using a freewheel sprocket. You can enlarge the center hole then drill the larger sprocket to line up with the low spots between four or five of the teeth on the freewheel sprocket and bolt it together that way. That's how they do the IPS stoker crank set up sold at the Hostel Shoppe. It is on the front chain wheel but the concept is the same and should transfer to a rear sprocket no problem.

I've seen this set up running an overvolted 500 watt motor and it handles the torque no problem, even when using a lesser expensive Dicta BMX freewheel sprocket.

What's your project?

tortuga0303
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Re: Sprocket Help

This is almost exactly the set up I have on my bike right now. Before I managed to get a small nut wedged into my planetary gearing setup, (doing quite a bit of damage) I ran a 700+ watt winch motor on it and it never caused me any problems. This was with the Dicta 20 tooth freewheel by the way. For boaring out the center of the sproket, I would recomend buying a dremel style tool, or using a grinding wheel (small diameter) and place it in the chuck of a drill press set up to its highest speed. Both of those methods seemed to work well, the drill press is a little slower, but it can handle being run for longer periods of time without overheating.

Wont catch me ridin dirty

Sturdly
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Re: Sprocket Help

Have you or will you post some pics of the winch set up.... sounds interesting.

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