ryobi weed eater bike

[Doc Sprocket]

Seems right to me. Now figure out the circumference of the tire. That will give you a distance per revolution, and you can work out theoretical speed from there...

 

[matman55]

Seems right to me. Now figure out the circumference of the tire. That will give you a distance per revolution, and you can work out theoretical speed from there...

ok, its 81.64. where do i go from here?

 

[Doc Sprocket]

Think on it- if it's 81.64 (inches?) then you need to convert to feet to get a foot-per-revolution number. By bouncing THAT number off the WRPM (wheel RPM) you get feet per minute. Now it's just a matter of converting the feet to miles, and minutes to hours.