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Friday, 31 January 2014

Bike porn

I was up till late last night, looking at bike porn. Electric bikes that go faster than a car, that can go up a flight of stairs. But specifically, at mid-motor bikes.

With most electric bikes, the motor is in either the front or back hub (or both), and drives the wheel directly. With a mid motor drive, it's mounted near the cranks. You replace the crankshaft and cranks with a shaft that has two sprockets. One of the sprockets is driven by the motor, the other one drives the back wheel via the usual chain and rear gears.

The big, big advantage of that, is that the motor is driving the back wheel via the gears. So to go up steep hills, you can change gear down; to go fast on level smooth ground, you change up to top gear.

Another advantage is that the motor, plus fixings, is a few kilograms lighter than the hub wheels.

So, for example, this

The cost is £300, I already have the batteries, doesn't it look nice? For off road use only, though.

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