Old 09-29-05, 01:40 PM
Dog is my co-pilot
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Just when you think you've seen it all!

As the rpm of the transmission wheels change, probably centifigal force pushes weights to the outside of the driving wheel and the sides of the pulley get closer together for an effective larger diameter, and the opposite on the driven wheel. No gears to change but a pair of variable diameter pulleys.

To much energy waste with a fiber/rubber drive belt for a bicycle.
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