### Wheel, Tire and Fender Fitment Calculator

Wheel and Tire Technical Information – Calculate Wheel Fitment, Tire Stretch and Rolling Radius. Includes Speedometer Error Calculator. Play with specs, try different settings and combinations, compare resultsâ€¦ [Read More…]

### Tire Change / Speedometer Change Calculator

This calculator is designed to give information related to tire size changes and the general impact they have on the calibration of a speedometer. It determines speedometer error and tire size information based on published [Read More…]

### Mr. Gasket Hot Rod Calc – Street and Strip Performance Calculator

A great all-in-one racer’s tool available from Amazon is the Hot Rod Calculator by Mr. Gasket. This hand-held Performance Calculator is programmed to calculate your vehicle’s performance based on temperature, elevation, atmospheric pressure, and moisture content. It helps you compensate for changes in altitude. [Read More…]

### Engine Displacement Calculator

This calculator determines the displacement of the engine by two methods; selecting the engine to get the geometry of the configuration, or by the geometry to get the engine. You may select the engine manufacturer and designation to get the exact parameters. [Read More…]

### Differential Gear Ratio Calculator

Enter the maximum potential safe engine RPM. Enter the tire size diameter and the target vehicle speed in MPH. Click “Calculate Differential Gear Ratio”. The value will be returned in estimated differential gear ratio, based on the entered values. [Read More…]

### How To Select Proper Rear-End / Differential Gear Ratio

A number of factors must be considered when selecting a rear-end gear ratio (ring & pinion set). Tire diameter, transmission choice (with or without overdrive) and desired highway cruising speed. [Read More…]

### Speed Potential Calculator for Ring Gear and Pinion Changes

This calculator is designed to give the potential speed values of a vehicle, based on the RPM of the engine, the ring gear and pinion gear ration, the final transmission gear ration (usually 1.00) and the tire diameter, ground to top of tire as mounted. [Read More…]

### Horsepower Gain from Additional Blower Pressure Calculator

Enter the anticipated blower pressure. Enter the normally aspirated horsepower at the flywheel or transmission. Click on Calculate. The value will be returned in estimated horsepower, based on blown pressure increase. [Read More…]

### How To Calculate Size of Carburetor Needed in CFM

Optimize performance with a correctly sized carburetor… This carburetor calculator is designed to give the engine’s air intake volume requirements in CFM. Enter the engine displacement and the anticipated maximum safe engine RPMs (typically known [Read More…]