Tools
8 free calculators. Pick a category or browse them all.
Tire Size Calculator
Calculate diameter, circumference, revs per mile, and speedometer error for any tire size.
Tire Size Comparator
Compare two tire sizes side by side and see the difference in width, height, and revs.
Plus-Sizing Calculator
Plan your wheel upgrade with recommended tire sizes that keep your speedometer accurate.
Wheel Offset Calculator
See how new wheels will fit, including clearance to suspension and fenders.
Gear Ratio Calculator
Check engine RPM at highway speed and find the right gear ratio for your tire upgrade.
Load Index Calculator
Check maximum weight per tire and compare against your vehicle's requirements.
Speed Rating Guide
Understand what speed ratings mean and why heat tolerance matters for performance.
EV Tire Matcher
Find EV-specific tires with the right load index, acoustic foam, and low rolling resistance.
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Using the Plus-Sizing Calculator to Plan Your Upgrade Without Rubbing | Tire Size Hub
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