Join Date: Feb 2010
Bikes: Old Norco frame in conversion process
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OMG guys... You'd never know you were friends...
Okay, a hub motor's top speed is limited by the volts (RPM, then multiply by the rim size and you have a set top speed) and torque by Amps draw, a combination of controller and battery C rating, etc - ultimately, the same limitations apply to both technologies.
The geared motor's top speed depends on where it's interfaced in the system, gear ratios, and such. At this point, you realize that torque in a different gear becomes "variable."
Not sure what a geared system would weigh, but from what I saw, it could ultimately be less than a 28lb hub setup.
Wind resistance is next - the faster you go, the more wind resistance, torque requirement and so on.
I think new's setup is rear mounted, so it doesn't take advantage of the front gear ratio - front mounted systems require an upgrade to a freewheeling bottom bracket (just replaced mine and it's not fun).... At that point, I would point you at some of the RC plane motors for speed/torque/strength ratio pwnage.