The Service Center at Randy’s Ring & Pinion has been in business for over 30 years. Randy’s is dedicated to driveline repair and replacement. Our mechanics are the best in the industry and have immediate access to over 6,000 parts to get the job done quick.
Find the rating for your street tires (example: 225/70R15 or 225/70/15). The first number will be the Width (in millimeters), the second will be the Aspect, while the third is the size of the wheel (in inches).
Place your corresponding numbers into the fields below to calculate your tire height.
To find your vehicle's RPM enter your Ring and Pinion Gear Ratio, Tire Height, and Speed then click "Solve".
* Auto = D in an AOD
* AOD is calculated at .70 transmission ratio
* Manual = 4th in a 5 speed
* 5 speed is calculated at .80 transmission ratio
Enter Ring & Pinion Ratio, Tire Height, Speed (mph), and Transmission Ratio then click "Solve" to calculate Transmission RPM
Enter the number of teeth on your Ring Gear and your Pinion Gear then click "Solve".
Enter your Bore Size, Stroke Length, and number of Cylinders; select either inches or millimeters then press "Solve" to find your exact engine displacement.
Convert liters to cubic inches and vice versa. Useful for determining your engine size for each metric
Cubic Inches to Liters
Liters to Cubic Inches
Enter the length of your piston rod under Rod Length and the stroke length of your engine crankshaft under Stroke then press "Solve" to find the rod ratio for your vehicle.
Enter your vehicle's torque in ft. lbs for any given RPM then click the "Solve" button.