GARAGE LIBRARY
Automotive Math Guides
Plain-English explanations of the measurements and formulas behind common wheel, tire, gearing, fuel and performance decisions.
Tire Size Explained
Decode 225/45R17, calculate diameter and understand speedometer changes.
Wheel Offset & Backspacing
Understand positive offset, inner clearance, outer poke and backspacing.
Gear Ratio, RPM & Tire Diameter
See how transmission ratio, final drive and tire diameter work together.
Power-to-Weight Explained
Learn what lb/hp and hp/ton can tell you, and what they cannot.
Fuel Cost & MPG Math
Estimate trip costs, annual fuel spending and the value of better MPG.