Find the Right Tires for Your Vehicle

Free tools to lookup OEM tire sizes, compare dimensions, plan rotations, and estimate tire life. No signup required.

Find Your Tire Size →

Tire Size Lookup by Vehicle

Enter your year, make, model, and trim to find the exact OEM tire size. Covers 20+ popular brands including Toyota, Honda, Ford, BMW, Tesla.

Most Popular

Tire Size Comparison

Compare two tire sizes side by side. See diameter, width, circumference, and speedometer error instantly. Perfect for plus-sizing decisions.

Essential Tool

Rotation Pattern Calculator

Get the correct tire rotation pattern for your drivetrain and tire type. Visual diagrams for FWD, RWD, AWD, 4WD, directional, and staggered fitments.

Maintenance

Tire Wear Calculator

Estimate how many miles and months your tires have left based on current tread depth and driving habits. Plan your replacement budget.

Safety First

Tire Pressure Calculator

Calculate recommended tire pressure when switching to a different tire size. Adjusted for width, aspect ratio, and load changes.

Upgrades

Why Tire Size Matters for Safety and Performance

Choosing the correct tire size is one of the most important decisions you can make for your vehicle's safety, performance, and fuel efficiency. The wrong size can affect your speedometer accuracy, ABS function, traction control, and even void your warranty.

At TireFit Pro, we provide free, easy-to-use calculators to help you make informed decisions. Whether you're replacing worn tires or upgrading to a larger size, our tools give you the data you need—backed by industry-standard formulas used by TireSize.com and major tire retailers.

How to Read a Tire Size

A typical tire size like 225/45R17 91V breaks down as follows:

Use our Tire Size Comparison tool to see how changing any of these numbers affects your overall tire diameter, speedometer accuracy, and ground clearance.

Where to Find Your Tire Size

  1. Driver's door jamb sticker — The most reliable source. Shows OEM tire size and recommended pressure.
  2. Tire sidewall — Look for markings like 225/45R17 molded into the rubber.
  3. Owner's manual — Lists factory tire sizes and approved alternatives.

Once you know your size, use our Tire Size Lookup to verify it against factory specifications for your exact year, make, model, and trim.

Common Tire Size Questions

Can I use a different tire size than stock?
Minor changes (plus or minus one inch in wheel diameter) are generally safe if the overall diameter stays within ±3%. Larger changes may require recalibration of your speedometer and can affect handling. Use our comparison tool to check before buying.
What happens if I install the wrong tire size?
Incorrect sizing can throw off your speedometer, reduce fuel economy, cause rubbing against suspension components, and in some cases trigger ABS or TPMS warnings. On AWD vehicles, mismatched diameters can damage the drivetrain.
Do all four tires need to be the same size?
For most vehicles, yes. Mixing tire sizes—especially on AWD or 4WD vehicles—can cause premature drivetrain wear. Some performance cars use staggered fitments (wider rear tires), which is factory-approved.
What is the legal minimum tread depth?
In the US, the legal minimum is 2/32 of an inch. However, safety experts recommend replacing tires at 4/32" for wet weather performance and 6/32" for winter conditions. Use our wear calculator to estimate when you'll need new tires.
How often should I rotate my tires?
Most manufacturers recommend every 5,000 to 8,000 miles. Use our rotation pattern calculator to find the correct pattern for your drivetrain and tire type.
Disclaimer: All tire size data, calculations, and recommendations provided by TireFit Pro are for informational purposes only. Always verify tire fitment with your vehicle's owner manual, door jamb sticker, or a certified tire professional before purchase or installation. Incorrect tire sizing can affect vehicle safety, handling, and warranty coverage.