oldford2
Well-known member
http://golenengineservice.com/calc/calcrpm.htm
This formula uses the tire diameter. You need to subtract some from the diameter to compensate for the compression of the tire at the bottom. Maybe 1/2" on the radius ( 1 on the dia). About 2700 rpm's @ 55mph on my 46 with 600:16 and 3.78 rearend if I am doing it right. John
This formula uses the tire diameter. You need to subtract some from the diameter to compensate for the compression of the tire at the bottom. Maybe 1/2" on the radius ( 1 on the dia). About 2700 rpm's @ 55mph on my 46 with 600:16 and 3.78 rearend if I am doing it right. John