In a parallel hybrid motorized bicycle, such as the aforementioned 1897 invention by Hosea W. Libbey, human and motor inputs are mechanically coupled either in the bottom bracket, the rear wheel, or the front wheel, whereas in a (mechanical) series hybrid cycle, the human and motor inputs are coupled through differential gearing. In an (electronic) series hybrid cycle, human power is converted into electricity and is fed directly into the motor and mostly additional electricity is supplied from a battery.
Because the power is applied through the chain and sprocket, power is typically limited to around 250–500 watts to protect against fast wear on the drivetrain. An electric mid-drive combined with an internal gear hub at the back hub may require care due to the lack of a clutch mechanism to soften the shock to the gears at the moment of re-engagement. A continuously variable transmission or a fully automatic internal gear hub may reduce the shocks due to the viscosity of oils used for liquid coupling instead of the mechanical couplings of the conventional internal gear hubs.
I'm looking to leverage the Cycle to Work Scheme and have been looking around for an e-bike to purchase. I used a lot of the information provided here and have come to the conclusion that the Kreiger from Woosh meets all my needs. 95% of the time the bike will be used to commute to and from work, the rest of the time I'll probably be rising it around the park with the kids. The thing I like about this bike is that it pretty much comes with everything (except the lock) that you'd need to get going. I guess, if I really wanted to, I could upgrade the Bafang motor on this to a BBS02 with a better battery.
Every major bike manufacturer—and literally dozens of smaller ones—is already in the e-bike game. Car companies aren’t far behind. Ford is already bankrolling an electric bike-share system in San Francisco, and plenty of others are eyeing up the e-bike market. “The car business is jumping in with both feet,” Benjamin says, “because they realize that cars in high-density urban areas, where more than half the human race lives, just aren’t working anymore.” With big transportation players like Uber looking into e-bikes, and cities searching for ways to relieve traffic congestion, programs may only continue to expand.

Electric Bikes Are Now Legal on Pennsylvania Roadways! Breaking News... According to the Bicycle Access Council of PA in their November 2014 News and Digest, Electric-Assist bicycles are now legal on Pennsylvania roadways as part of Act 154. "Electric-Assist bicycles are now legal on Pennsylvania roadways as part of Act 154. In a convoluted way since first introduced in 2010, a last minute amendment was introduced by Representative Kevin Schreiber (D-95) with...


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