Chevy Truck Expert Tools
Free truck calculators: road speed and rpm from tire size, axle ratio and transmission gear, plus what a tire or gear swap does to your speedometer.
Free calculators. Every formula and price range is cited on the tool page.
Gear Ratio Calculator: RPM, Tire Size and Road Speed
Enter tire diameter or sidewall size, axle ratio, gear ratio and rpm; get road speed, rpm at your cruise speed, and the effect of new tires or gears. Open the calculator
Suburban Cargo-Fit Measurement Record
A printable and editable worksheet for checking whether an item actually fits in a 2021+ Suburban: the real vehicle, the item as packaged, the loading path, and the planning-tool inputs side by side. Open the worksheet