Calculate rpm

John s

1 µW
Joined
Jun 18, 2018
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Looking for rpm of a 10" and a 12" overall tire with travel speed of 3 mph ? Can anyone help please.
Thanks
 
12" x 3.14 (diameter x pi) equals about 38" around, 5280x12 / 38 ( to get inches in a mile, then number of rotations per mile) equals about 1667. 1667 / 60 equals about 28 rpm for 1 mph, times three gives you about 85 rpm for 3 mph.

!0 inch will be slightly higher rpm... ( more rotations per mile due to smaller circumference)... about 100 rpm if you don't feel like doing the math :D
 
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