This is my second one- a 50- not quite as fast or strong but lightweight and manuverable- kit 41 sprocket
very "pedable" with 700 C tires- but I would now recommend smoother tires, as these treaded ones here are prone to picking up the broken glass that litters the lanes here in Jacksonville.
Updated pic of the bike. I'm thinking of taking off the front bag and reworking the light and eventually moving the back light to the rear fender. Just mounted the chain guard recently.