Z31 Speed and RPM Calculator

This Calculator was writen by Paul Hilman (AZ-ZBUM) Back in the day. Credit goes to him for the calculations

Calculator Form

This will calculate the actual speed or RPM given the other

Change any one of the "Initial Information" (bolded) parameters to see the affects.

Initial Information

Section width (millimeters):
Tire aspect ratio:
Wheel diameter (inches):
Tire height (inches):		RPM:	MPH:
Tire rollout (inches):
differential gear:		Speed	RPM
transmission:
First gear transmission gear ratio:	1st
Second gear transmission gear ratio:	2nd
Third gear transmission gear ratio:	3rd
Fourth gear transmission gear ratio:	4th
Fifth gear transmission gear ratio:	5th
Reverse gear transmission gear ratio:	Rev