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  • MPH Formula
    
    (motor rpm) x (sprocket ratio) = axle rpm
    3800 (max) x 12/60 (est.) = 760 rpm
    (if there's a jack shaft just multiply its' ratio)
    
    (axle rpm)x(tire circumference)=inches per min
    760 rpm x (15" O.D. tire) = ipm 
    760 rpm x (15 x 3.1416) = ipm
    760 rpm x 47.124" = 35814" ipm
    
    35814 ipm divided by 12 = 2984.5 ft per min
    2984.5 fpm divided by 88 = 33.91 miles per hour
    
    Note: 12" =1' (feet to inches)
    88 ft/min. = 1 mph 
    



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