Every tire has a string of numbers and letters printed on the side, like P215/65R16 98H. It looks confusing, but once you know what each part means, it tells you everything you need to know about that tire.
Breaking Down the Code
- P — Tire type (P for passenger car, LT for light truck)
- 215 — Tire width in millimetres
- 65 — Aspect ratio (the sidewall height as a percentage of the width)
- R — Radial construction (almost all tires today)
- 16 — Rim diameter in inches
- 98 — Load index (how much weight the tire can carry)
- H — Speed rating (maximum safe speed)
Why the Load Index Matters
The load index tells you the maximum weight each tire can safely carry. Going lower than what your vehicle needs can cause the tire to wear out fast or fail under heavy loads. Always match or exceed the load index listed in your owner’s manual or door jamb sticker.
Why the Speed Rating Matters
The speed rating isn’t about how fast you plan to drive — it’s about how the tire is built to handle heat and stress at higher speeds. A lower-rated tire than what your car came with can affect handling and safety, even at normal highway speeds.
Don’t Downgrade When You Replace
When it’s time for new tires, it can be tempting to save money with a lower load index or speed rating. We always recommend matching the original specs on your vehicle’s door jamb sticker, so your car performs and handles the way it was designed to.
Not sure what size or rating your vehicle needs? Bring it by President Tire & Wheels in Waterloo and we’ll check it for you, no charge.
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