Gear Ratio Calculator
Estimate speed or RPM in each gear based on your transmission, rear end, and tire size.
Go to Ratios
Perfect Rear Gear Estimator
Estimate your ideal rear gear using vehicle weight, horsepower, finish-line RPM, and tire diameter.
Go to Rear Gear Estimator
1/8th Mile ET/MPH/HP
Quick estimates for ET, MPH and horsepower in the eighth-mile.
Go to 1/8 Mile Calculator
Measure Wheel Offset
Simple step-by-step guide showing how to measure wheel width, backspace, and offset with just a tape measure.
How to Measure