Recent content by autodoctor911

the first part of the torque arm will try to rotate clockwise in this photo, but the longer part is attached by one bolt, so introduces another pivot, creating a push-rod effect in the longer part of the "torque arm". If the attachment point to the frame is not constrained in the fore/aft...

that won't work, for the above stated reason, but Why do they use such crude axles and small bearings on hub motors? the only parts that need to turn(other than the freewheel) are much larger in diameter, yet the axles are smaller than most high qhality bicycle hubs. If someone were to design...

Ok, so I guess no one has tried the 23" bridgestone tw9 on a 650B rim. A 35mm wide rim should be OK for a 3.0 tire, right? Does anyone know of a wider 650b rim? I can find 29er and 26er rims wider, but no 650b. I would much prefer a tire/rim combo that is very hard to get the tire over the...

I found this link on another topic here: http://www.bike-eu.com/Home/General/2010/3/NexxtDrive-Claims-Most-Advanced-e-Bike-Transmission-BIK003881W/ this is the kind of system I am thinking of. Is anyone making it. to me the mechanical, and electric motor portion are fairly simple, and I don't...

I would think you could design a very low power system that would have great range with very little weight, that wouldn't really be much faster than a normal bike, but actually lighter than a nuvinci cvt or even an internal gear hub.

I was wondering if anyone has seen any bicycle drive systems, either production or prototype that use an electric motor connected to the chain drive in a way as such that the motor drives one element of a planetary, while the pedal force runs another, and the third element drives the bike. It...

Has anyone attempted to mount Motorcycle type tires on bicycle rims that have the same Bead Seat Diameter? For example: a 16" scooter/moped tire on a 20" BMX size wheel(both have 406mm BSD, or, a 23" front tire from a 78 Honda trail bike on a 650b extra wide rim, like the velocity P35(both have...