How do i determine teeth count on my final drive?

Question

i have a custom built chopper softail with a belt circumfrance of 73 inches and a 70 tooth pulley on the rear and a 32 tooth pulley on the front and 22.5 inches from center of pulley to center of pulley? can you help me?

Answer 1

The 70 tooth pulley on the rear sprocket is the tooth count on the final drive.

Answer 2

If it were me, I guess I'd figure the pulley circumference (diameter X 3.14) of both pulleys, divide each by 2, and add 22.5 X 2.   That should give you the length of belt needed.  

Say the front pulley is 3" in diameter and the rear 10".  The front would be 3 X 3.14 / 2, or 4.71".  The rear would be 10 X 3.14/2, or 15.7".  22.5 X 2 = 45+4.7+15.7= 65.4" length belt.

Answer 3

Are you asking what size belt to use?

If so, you should have determined that before building a custom bike.

Answer 4

UH !! Do What ??

More speed smaller rear

More pull larger rear

Is that what your asking??

Or does it just not fit ?