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The dynamic bike uses a shaft drive to transmit power from the cranks to the Shimano Nexus internally geared hub. Shaft drive has been used in asia for years. There the majority of bicycles are used for daily transport. They are constantly exposed to the elements. Furthermore the majority...

Thanks for your input Mike... I am one of those screwy guys that only has one cog and one chain ring on my only bike. Is it efficient in most situations? Absolutely not, but it gets me a great workout in less time. Most recreational riders I know don't regularly get out of the middle ring...

I am an avid mountain biker and a mechanical engineer. Release of the internal geared rear hub has recently made shaft driven wheels possible to the biking world. It has however raised some serious questions in my mind. We all know that chains are a very efficient means of transmitting...