How to Find Tire Size: Complete Guide 2025

Finding the right tire size for your vehicle is crucial for safety, performance, and fuel efficiency. Whether you're replacing worn tires or upgrading to new ones, knowing how to locate and understand tire size information will save you time and ensure you get the perfect fit.

Where to Find Your Tire Size

1. On Your Current Tires (Sidewall)

The most reliable place to find your tire size is on the sidewall of your current tires. Look for a series of numbers and letters that typically appears in this format:

Example: P225/65R17 102H

This alphanumeric code contains all the information you need about your tire size. The marking is usually located on the outer sidewall and may appear in multiple locations around the tire.

2. Driver's Side Door Jamb

Open your driver's side door and look for a sticker or placard on the door frame. This manufacturer's label contains:

• Recommended tire size
• Proper tire pressure (PSI)
• Vehicle weight information
• Manufacturing date

3. Owner's Manual

Your vehicle's owner's manual contains the original equipment tire size specifications. This is particularly useful if:

• Your current tires are not the original size
• The sidewall markings are worn or damaged
• You want to verify the manufacturer's recommendations

Understanding Tire Size Numbers

Let's break down a typical tire size marking: P225/65R17 102H

Step-by-Step Guide

Step 1: Locate the Tire Markings

1. Park your vehicle on level ground
2. Examine the sidewall of any tire
3. Look for the size marking (usually in white lettering)
4. Clean the sidewall if markings are dirty or unclear

Step 2: Record the Complete Size

Write down the entire tire size code, including:

• All numbers and letters
• Any additional markings (DOT code, brand, model)
• Load index and speed rating

Tools to Help You

Online Tire Size Calculator

Use our free tire size calculator to:

• Convert between different size formats
• Compare tire dimensions
• Calculate speedometer differences
• Find equivalent sizes

Safety Considerations

• Never install tires smaller than manufacturer specifications
• Ensure adequate load capacity for your vehicle
• Match speed ratings to your driving needs
• Replace tires in sets when possible

Conclusion

Finding your tire size is a straightforward process once you know where to look and how to interpret the markings. Always prioritize safety by ensuring your replacement tires meet or exceed your vehicle manufacturer's specifications.

Use our tire size calculator to compare sizes, calculate differences, and ensure you're making the best choice for your vehicle and driving style.