You are right, been talking to pennsylvania dept of transportation supervisors and they tell me over and over that bicycles cannot be registered, no matter what kind of assist engine they have or have not, they do not a vin number, they do not have road legal safety systems, they do not have street legal lighting, cops will quote title 1302 of the vehicle code, it doesn't mention bicycles/pedacycles as being exempt from registration so cops assume that this means bicycles are required to have registration, it isn't so, this is only because ordinary bicycles/pedacycles are not considered motor vehicles by Pa or the feds, but I still see statues online that gas engine bikes are considered mopeds by Pa and sometimes I see that electrics are too,, the electric bikes are regulated by the feds, I don't know about the gas ones, mike