Know Your Tires Before You Buy or Swap

Calculate exact internal air volume of any tire in liters, gallons & cubic inches — useful for sealant dosing and capacity comparison.

Find how much your speedometer reads off after a tire size change — get real speed at any indicated reading and odometer error %.

Calculate static, loaded, and dynamic rolling radius plus circumference and revs per mile for any P-metric tire.

Convert wheel ET offset to backspacing and estimate outer poke and inner clearance for custom fitment.

Check if staggered front/rear tires are safe for AWD and xDrive — compares diameter difference and rolling radius.

Calculate exact scrub radius from SAI, spindle offset, and wheel ET — or instantly see how a wheel swap or spacer shifts your scrub radius, with drivetrain safety rating.

Find minimum, ideal, and maximum rim width for any tire section width based on industry correlation tables.

Convert between P-Metric and Flotation tire sizes and compare two sizes with diameter, sidewall, and speedometer error.

Calculate tire contact patch area in sq in and cm² from vehicle load and inflation pressure.

Find recommended tire pressure by vehicle type and convert PSI ↔ kPa instantly.

Instantly convert tyre pressure between PSI and kPa — perfect for UK and European vehicles.

Decode your tire DOT code to find manufacture date and age — get a safety warning if tires are over 6 years old.

Compare spare tire diameter to primaries and check AWD/4WD tolerance to avoid drivetrain damage.

Compare two tire sizes side-by-side — diameter, sidewall, speedometer error, and revs/mile instantly.

Find the exact diameter difference between two tire sizes with safe-change %, speedometer error, and AWD tolerance.

Solve for the aspect ratio needed to hit a target diameter — ideal for plus-sizing while keeping speedometer error under ±3%.

Understand UTQG temperature grades (A, B, C) and what they mean for heat resistance and high-speed safety.

Estimate inner suspension clearance and outer fender poke when changing wheel width, offset, or tire size.

Check if your tire width is compatible with your rim — see stretch or pinch estimate and safety bands.

Find Plus-0, Plus-1, and Plus-2 tire sizes within safe diameter range with speedometer error and fitment impact.

Calculate remaining tread life from depth in 32nds or mm and decode UTQG treadwear ratings.

Convert tire speed rating letters (Q–ZR) to max safe speed in mph and km/h with OEM matching guidance.

Calculate exact sidewall height in mm and inches from tire width and aspect ratio.

Convert tire Load Range (SL, XL, C–H) to ply rating, max PSI, and typical use for LT and trailer tires.

Convert tire Load Index to max load capacity in lbs and kg — match it to your vehicle GVWR safely.

See how bigger tires affect effective gear ratio and RPM — calculate the regear needed to restore stock performance.

Understand positive, negative, and zero caster — how it affects steering feel, self-centering, and tire wear.

Calculate engine RPM at any speed from tire size, axle ratio, and gear — see the RPM impact of bigger tires.

Understand toe-in, toe-out, and zero toe — how small changes affect stability, turn-in, and tire wear.

Compare any two tire sizes with a to-scale visual diagram, bar charts, and live speedometer simulation.

Calculate tire revolutions per mile/km, rolling circumference, and speedometer error after a size change.

Check tire stretch or pinch for any tire and rim combo — see safe limits and street vs show risk levels.

Estimate prorated tire value and remaining tread life — useful for warranty claims, insurance, and used tire sales.

Calculate BMW tire fitment for any model — compare OEM vs aftermarket sizes, check xDrive 1% rolling diameter rule, M-series staggered specs, and speedometer error.

Complete MX-5 Miata tire calculator for NA, NB, NC, ND — decode sizes, compare stock vs new with speedometer correction, check generation-specific fender clearance, and get track-day recommendations.

Manufacturer OD tolerances for AWD systems + interactive mismatch checker for Subaru, BMW, Audi, Toyota, Honda, and Ford.

Learn to decode P-Metric & Flotation tire sizes.

Understand ply ratings and load ranges for LT/ST tires.

A step-by-step guide to planning wheel and tire setups.

Tire sizing tools and resources for Toyota models.

Toyota Tacoma tire guide — OEM sizes by generation, 33s vs 35s, lift fitment, offset and backspacing, and the best setups for daily, overland, and off-road use.

Complete Jeep Wrangler and Gladiator tire guide — OEM sizes by trim, 33 vs 35 vs 37 inch tires, lift requirements, wheel offset, gearing recommendations, and speedometer correction.

Ford F-150 tire sizing, load range, and compatibility tools.

OEM sizes for F-150, Silverado, RAM, Tundra, and Tacoma. Load ranges, LT vs P-metric, biggest tires without a lift, plus-sizing, and towing safety.

BMW tire sizing guide: OEM sizes by chassis code, xDrive rolling diameter rules, M-series staggered specs, run-flat vs conventional, star-mark tire info, and seasonal advice.

Chevy Silverado tire sizing, upgrades, and essential tools.

How to read metric tire codes, convert to inches step-by-step, aspect ratio explained, load index and speed rating charts, plus-sizing rules, and a quick-reference metric-to-inch equivalents table.

Factory tire sizes for RAM 1500 (DT and Classic), 2500, and 3500 by trim. Biggest tires without a lift, Rebel and RHO fitment, load range rules, and speedometer correction table.

Performance tire sizing and fitment tools for Ford Mustangs.

OEM tire sizes, AWD diameter rules, and upgrade guidance for Subaru WRX, Forester, Outback, Crosstrek, and more.

Tire sizing information and tools for Honda vehicles.

Tire sizing tools for Mazda3, CX-5, Miata, and other models.

Tire sizing tools for Nissan Altima, Rogue, Frontier, Z series, etc.

Performance tire sizing and fitment tools for Chevy Camaros.

Performance tire sizing tools for all Chevy Corvette generations.

Precision tire sizing tools for Porsche 911, Cayman, Macan, etc.

Tire tools for Mercedes-Benz C-Class, E-Class, S-Class, GLC, GLE, AMG.

Complete Audi tire guide — OEM sizes for A3/A4/A6/Q3/Q5/Q7/Q8/e-tron, AO markings, plus-sizing rules, quattro AWD diameter limits, TPMS reset, and seasonal tire strategy.

Tire sizing tools for Volkswagen Golf, Jetta, Tiguan, Atlas, etc.

Complete Tesla tire guide — OEM sizes for Model 3, Model Y, Model S, Model X by year and trim, how to find your tire size, T-mark tire system explained, EV-specific differences, AWD matching rules, and winter tire guidance.

Complete Lexus tire guide — OEM sizes for IS/ES/NX/RX/GX/LX, IS 350 stagger explained, plus-sizing trade-offs, run-flat and AWD advice, and winter tire strategy by model family.

Tire tools for Infiniti Q50, QX60, QX80, and more.

Mazda MX-5 Miata tire guide — NA/NB/NC/ND OEM sizes, 15 vs 16 vs 17-inch wheels, street vs autocross vs track setups, fitment zones, and why the best Miata setups come from balance.

ATV tire sizing, conversion, pressure tips for off-road use.

ST tire tools: size analysis, load index, age, pressure guides.

Crucial tire information for RVs and motorhomes.

Tips for understanding tire specs to find genuine deals.

Choosing winter/snow tire sizes, including minus sizing.

Learn about choosing Summer, UHP All-Season, and track tires.

Understand low profile tires, their pros & cons, and sizing.

Sizing info and tools for UTVs / Side-by-Sides.

Info and tools for agricultural tractor tires.

Importance and patterns for tire rotation (FWD, RWD, AWD).

Basics of wheel alignment: Camber, Caster, and Toe.

Tips for long-distance motorcycle comfort, mileage & all-weather tires.

Understand scrub radius and its impact on steering & handling.

Choosing sport bike tires for grip, handling, and performance.

Choosing tires for cruisers: comfort, mileage, load, style.

OEM sizes, terrain guide, pressure charts, mousse vs tube comparison, and fitment tables for KTM, Honda, Yamaha, Kawasaki, Husqvarna, Suzuki, and Gas Gas.

A concise guide to MTB tire basics: types, sizes, pressures.

Key info on road bike tire selection: widths, pressures, types.

Essentials for choosing gravel bike tires: widths, treads, pressures.

Guide to fat bike tire characteristics: widths, pressures, terrain.

How rolling resistance affects efficiency and fuel economy.

Decode every forklift tire format (press-on, pneumatic, metric), read size charts by brand and capacity, and learn when to replace.

Guide to golf cart tire sizes, types, and pressure.

Guide to lawn mower tire sizes, treads, and maintenance.

Info on tires for heavy construction machinery.

Info on specialized aircraft tires: pressures, construction.

Overview of racing tires: slicks, wets, drag radials.

Understanding tires for tractors, harvesters, farm equipment.

How tires affect fuel consumption and tips for improvement.

What causes tire noise and how to choose quieter tires.

How tire characteristics influence vehicle ride comfort.

How tires impact vehicle handling, grip, and steering.

How tire condition and type affect braking performance.

Understanding aquaplaning causes and prevention tips.

Understanding bead seat diameter and its importance.