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Deleted member 4366
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You need to be very careful when buying a bike with a crank-drive and small wheels. Often, the necessary large chainwheel isn't fitted (or even available), which makes the gearing so low that it's impractical to pedal, unless you like to go everywhere dead slow.
The other problem you need to look out for is motor run-on. All these motors run on for a bit after you stop pedalling, which messes up gear-changing, especially on the hub gears that won't change gear if there's any pressure on the chain. My preference would be for derailleur gears. Forget about Nuvinci CVT. It's too heavy, though it solves all the gear-changing problems.
Personally, i can't see any advantage in using a crank-drive on a bike with small wheels. I think a hub-motor would be a much more sensible solution. it's simpler, lighter and will have all the power and torque you need.
Not many folding bikes can be wheeled when folded.
The other problem you need to look out for is motor run-on. All these motors run on for a bit after you stop pedalling, which messes up gear-changing, especially on the hub gears that won't change gear if there's any pressure on the chain. My preference would be for derailleur gears. Forget about Nuvinci CVT. It's too heavy, though it solves all the gear-changing problems.
Personally, i can't see any advantage in using a crank-drive on a bike with small wheels. I think a hub-motor would be a much more sensible solution. it's simpler, lighter and will have all the power and torque you need.
Not many folding bikes can be wheeled when folded.
