Well I'm bored so a new project, adding a electric motor to my bicycle I picked up a 2000lb winch from harbor freight on monday and I took it the machine shop at RMU yesterday before the baja meeting and ripped it apart, cleaned the brushes, drilled some vent hole, milled out the bottom and hooked up a tach to it. At 24volts I got some 3400rpm out of it I'm going to use a 10T sprocket on the motor and a 48T on the rear wheel for a 4.8:1 gear ratio
I'm going to mount the motor above the rear wheel and attach the 48T sprocket to the left side of the hub opposite of the normal gears.
like this
27" rear wheel (cir 84.75")
3400 / 4.8 = 708rpm
708rpm * 84.75" = 60,003"
60003" / 12" = 5000.25"
5000.25 / 88 = 56.8mph