OK so that's inches per min
if I use
2x 2,750rpm motors
3 inch dia wheels
then we do pi times everything
2,750 (only 1 2750 having 2 motors does not mean you double it)
x 3 (for the wheels in inches)
x 3.141592
that's 25,918.2
or 24mph at top speed
with 13 inch wheels it will do 98MILES PER HOUR! at top speed
for a fw about 25mph is nice and fast