Double freewheel? Do they exist?

GoldenMotor.com
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jlatshaw

New Member
Jul 18, 2013
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Murica
Hello,

So I'm building an ebike, and I have an electric motor that I will hook up to my rear sprocket of my bike with a chain so that I'll have a pedal assist relationship going on.

In this situation I will always have to be pedaling, and if I ever want to turn my motor off (or my batteries run out) I'd like to pedal on my own without spinning my motor unnecessarily which I would rather not do.

So I am looking for a solution to this problem that will allow me to be able to have: full pedal (without spinning my motor), full motor (without moving my pedals), or pedal and motor assisted.

I believe that if I have a "Double freewheel" or "double roller" on my rear sprocket that this will fix the problem for me. What I mean by a double freewheel is to have some sort of freewheel that I can have a chain from my pedal on one sprocket and a chain from my motor on another sprocket and have them independent of each other (either can spin while the other is stationary or they can spin together).

Does something like this exist? What would be it's rightful name? Any google helps?

Thanks for any help,
-James
 
B

bigbutterbean

Active Member
Jan 31, 2011
2,417
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Lebanon, PA
If you are connecting your engine to the pedal side, a front chainring freewheel like what the sbp shift kit uses is your answer. If you're connecting the engine to the non-pedal side, there used to be a deal called the HybriPed sprocket, which had a pin in it and if you pulled the pin out, the sprocket would freewheel. At least that's how I think it worked. I dont know if they are still around or not.
 
Sidewinder Jerry

Sidewinder Jerry

Well-Known Member
Dec 19, 2011
2,008
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Rockwood, TN
Staton Inc shiftkit is a double freewheel setup. The engine chainring and the peddle chainring(s) operate independently of each other. David's kits have pull start engines therefore you don't have to bump start them. That's why SBP shiftkits only use a single freewheel so you can bump start engines without pull cords. Satin Inc also sells flip flop hubs. You'd need a left side freewheel.
 
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maurtis

maurtis

New Member
Dec 14, 2011
707
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Kyle, TX
Staton makes a hub with left hand freewheel threads and right hand freewheel threads: http://www.staton-inc.com/store/products/Rear_36_Hole_12_gage_Hub_Left_and_right_hand_threads-859-35.html

They also have a left hand thread freewheel clutch to bolt various tooth sprockets to.

My Mongoose CX24V450 uses a similar setup with the motor driving a 16T freewheel on the left side and the pedal chain driving the right. I tried finding a replacement hub like that one to use on another build, but since the bikes have been out of production for years, they do not seem easy to come by. And that Staton one at $90... The BGF hub is priced right, but I have no idea of the quality.

Good luck!
 
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chmn22s

chmn22s

New Member
Jun 8, 2017
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@ maurtis I can't find the hub you linked to. it's a very old link :p
still searching
 
chmn22s

chmn22s

New Member
Jun 8, 2017
20
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59
I think this is maybe what I was interested in originally. freewheel sprocket and HD drum brake axle kit from bicycle-engines
 
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