I was at the Trek dealer today and he let me ride their belt drive around the parking lot. It was incredibly smooth! It has a cogged belt like a motorcycle. It's a fixed speed, but the dealer said Trek was talking about installing Shimano's new 7 speed hub on that model. He'd said the hub was a marvel and had a wide range of speeds. The one little ride made me a believer for belt drive. If that new hub is any way near that good I think they may really have something. What's your opinion of the belt drives? The wave of the future? They've already taken over the motorcycle industry. If they can hold up to that kind of torque they must be realy durable.