On motorcars, handcars the wheels are tapered. On a velocipede the front and rear wheels are concave and the outrigger wheel is tapered.
You can purchase the tapered wheels from The HARSCO Corporation, I don't have a number.
I have seen homemade Velocipedes with wooden wheels with homemade treads made from steel sheet that looked real authentic.
SMITTY GOIN' LOCO
LOCOMOTIVE ENGINEER, RETIRED
Last run July 24, 1992
Sometimes I sit and wonder how come I am not in a mental institution then I take a good look around at everyone else and realize, maybe I already am!!!