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How to Read Tire Size: A Complete Driver’s Guide
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Time to read 3 min
Understanding how to read tire size is essential for making safe, informed decisions about tire replacement and maintenance. On every tire sidewall is a string of numbers and letters, like P215/65R16 95H, and each part has a specific meaning. This guide will help you break down the full code so you can choose the right tires for your vehicle.
Tire Size Example: What P215/65R16 95H Means
Let’s break down the components:
P = Tire type. "P" stands for Passenger vehicle. You may also see LT (Light Truck) or no letter at all (Euro-metric).
215 = Section width in millimeters (sidewall to sidewall).
65 = Aspect ratio, or sidewall height as a percentage of width (65% of 215mm).
R = Construction type (Radial is standard).
16 = Wheel diameter in inches.
95 = Load index, indicating how much weight the tire can support (95 = 690 kg).
H = Speed rating, representing the max speed capacity (H = 210 km/h).
Where to Find Your Tire Size
Check the tire sidewall ( and learn how to use a tire inflator properly ) for your current tires
Look at the driver’s door sticker or owner’s manual
Ask your mechanic or tire dealer to verify
Why Tire Size Matters for Safety and Performance
Tire size affects more than just fit—it plays a role in:
Handling and cornering stability
Fuel economy
Braking performance
Load capacity and towing safety
Incorrect tire size can cause uneven wear, traction loss, or speedometer errors.
Tips for Replacing Your Tires Correctly
Use dependable gear to keep your tire pressure accurate—explore the Woowind Ventus Pro for fast and precise inflation.
Always match OEM specifications for size, load index, and speed rating
Replace tires in pairs on the same axle for balance
Check the DOT date code (e.g., 2523 = 25th week of 2023)—and if you're unsure where to service your tires, here’s where to get air for your tires near you
Balance and align tires during every replacement
Choose tires that match your driving needs: city, highway, winter, or off-road. Browse our car air pumps for everyday inflation support.
Pro Advice: Selecting Tires for Your Driving Conditions
Urban commuters: Opt for lower rolling resistance to save fuel
Off-road drivers: Choose wider, deeper-tread options with reinforced sidewalls
Long-distance travelers: Look for all-season comfort and load support
Cold climates: Use winter tires marked with the snowflake symbol (3PMSF)
Final Checklist: What to Confirm Before Buying New Tires
Tire size matches your car’s OEM recommendation
Load index and speed rating meet or exceed manufacturer specs
Tire is appropriate for seasonal/weather conditions
DOT date is within the last 3 years for freshness
Installation includes professional balancing and alignment. For versatile inflation, explore our electric air pump collection .
FAQs
How do I read the numbers on my tire?
Each part of the code (e.g., P215/65R16 95H) represents the tire type, width, aspect ratio, construction, wheel size, load index, and speed rating.
Where can I find the correct tire size for my vehicle?
Check the tire sidewall, your vehicle's owner manual, or the sticker on the driver’s door frame.
Can I use a different tire size than what's listed?
Always match your OEM specifications. Using a different size may affect performance, safety, or fit.
What does the DOT code on a tire mean?
The DOT code includes the manufacturing date. For example, 2523 means the tire was made in the 25th week of 2023.
How often should I replace my tires?
Replace tires every 6 years or sooner if tread depth is low, the tire is damaged, or the DOT date is expired.
Tim Huang
Tim Huang has extensive experience in the development and optimization of electric air pumps , specializing in portable tire inflators, electric air pumps, and wireless inflation solutions . With a strong background in product development, procurement, and quality assurance , he ensures that every Woowind product meets high performance and reliability standards. Connect with Tim on LinkedIn: Tim Huang