Does anyone know where I can purchase a bicycle wheel (rear or front) that has a second drive cog on it? I have some old electric motors and lawn trimmer engines lying around. I'd like to fit them to bicycles for a father/son project. (I don't like how engine kits like the Z-box put stress on the spokes and have to be constantly checked and tightened.)
The bike in this post seems to have a second cog, which makes me think they must be out there somewhere:
i can only assume that the two cogs have some sort of freewheel mechanism, because if they are fixed you are going to have the pedal chain turning as well when the motor is on.
for a 2-stroke powered bicycle you don't really need the pedals connected to anything. they will be there just to put your feet on.
Sorry - I meant still has the standard chain/freewheel cog going to the pedal, but has a second cog on the other side of the wheel hub. Well, I assume that's how it works anyway. Too hard to tell from the photo. The pedals would still freewheel, but an electric motor would still turn. I think!?
I own a bike shop. Best way to do it is with disc brake back wheel. You can mount the second cog to the disc mounts.
That's a good idea - thanks!
I thought I'd seen something like what I first described… A (mountain bike) rear wheel with the standard cassette, but the hub was threaded on the left side so you could screw on another cog/gear of some kind. Wish I could remember where I saw it.
Some BMX/Track/Fixie wheels have threads on both sides, so you can swap gearing easy while racing. You would need to play with axle spacing and dishing, probably more trouble than its worth.
Z box style motors (google), use a cog bolted to the spokes with leather or rubber in-between. Would not recommend though as the wheels just aren't up to snuff and you will eat them for breakfast.
Yeah, I don't like the z-box method.
I saw a guy once that had formed a channel of galvanised sheet metal into a V shape and into a circle. Then he welded tabs of metal around the edge, which he screwed to the bike rim. Then also fitted the drive wheel from a clothes dryer motor onto an engine, and used the rubber belt from the same dryer. He moved a springed lever using one of his brake levers to tighten/loosen the belt so the engine either started from the bike moving, or didn't drive constantly when the engine was off.
But I've seen some great conversions on youtube, where they use a chainsaw engine - but they completely remove the original pedal drive, which doesn't suit what we want to do.
tip shop?