Join Date: Dec 2007
Location: Boone NC USA
Bikes: Bianchi hybrid. Dunelt 3-sp. Raleigh basket case. Wanting a Roadster.
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Interesting, as I understand your post, you want to recover your mountain bike to use as a mountain bike, and want to put the motor on a single speed bicycle to use as a commuter? If so, you are not getting very useful answers.
1. A single speed bicycle is not necessarily a fixed gear bicycle. You would not want to use a fixed gear bicycle, but a single speed with a freewheel should work fine.
2. Many single speed cruisers have been motorized over the years, and there is no reason you cannot swap your motor to one of them.
3. The reason for all those gears, is not to make it easy to pedal, but to make it possible for a high performance rider to maintain the most efficient cadence at what ever speed conditions permit. If we are not athletes there really is no reason for all those gears. Most of use could get by with 5 speeds quite well, but of course that is not much of a selling point is it? With a motor to provide some extra push on uphill or upwind rides that single speed you are talking about should work quite well.
4. I have been thinking lately of getting something like a Schwinn Hinge (single speed steel folder) and motorizing it. The only problem I see with that is it would cost about the same as buying a 150cc motor scooter (I do not have a motor on hand and would have to buy the whole setup), which can keep up with highway traffic, and would be much more fun to ride in the rain than a bicycle, and I already have an antique 3-speed, and a 18-speed commuter (converted hybrid) anyway.