How to Read a Tyre Size
Every tyre has a standardized code printed on its sidewall. This code tells you the tyre's width, profile, construction type, rim diameter, load capacity, and speed rating. Here's an example:
1. Section Width (205)
The first number is the width of the tyre from sidewall to sidewall, measured in millimetres. In this example, the tyre is 205mm wide. Wider tyres generally provide better grip but may increase fuel consumption.
2. Aspect Ratio (55)
The number after the slash is the aspect ratio — the height of the sidewall expressed as a percentage of the width. A 55-series tyre has a sidewall height that is 55% of 205mm = 112.75mm. Lower numbers mean a shorter sidewall, which improves handling but reduces comfort.
3. Construction Type (R)
R stands for Radial construction, which is the standard for modern passenger car tyres. You may also see D (Diagonal/Bias-ply) on older or specialised tyres, and RF for run-flat tyres.
4. Rim Diameter (16)
The diameter of the wheel rim in inches. This tyre fits a 16-inch rim. Always match the rim diameter exactly — you cannot fit a 16-inch tyre on a 15-inch rim.
Load Index & Speed Rating
Load Index
The number after the rim diameter is the load index — a code that corresponds to the maximum weight the tyre can carry.
| Load Index | Max Load (kg) | Common Use |
|---|---|---|
| 82 | 475 kg | Small cars |
| 86 | 530 kg | Compact sedans |
| 91 | 615 kg | Mid-size sedans, SUVs |
| 95 | 690 kg | SUVs, pickups |
| 100 | 800 kg | Light trucks, large SUVs |
| 110 | 1,060 kg | Commercial vehicles |
Speed Rating
The letter at the end indicates the maximum speed the tyre can safely handle under its rated load.
| Rating | Max Speed | Typical Use |
|---|---|---|
| T | 190 km/h | Family sedans, vans |
| H | 210 km/h | Mid-size cars, SUVs |
| V | 240 km/h | Sports sedans, performance cars |
| W | 270 km/h | High-performance vehicles |
| Y | 300 km/h | Super cars |
Tip: You can always fit a tyre with a higher load index or speed rating than recommended, but never go lower. Check your vehicle's manual or the sticker on the driver's door jamb for the manufacturer's specifications.
Special Tyre Markings
- LT (Light Truck): Tyres designed for pickups, vans, and light commercial vehicles. E.g., 215/75R15 LT
- PR (Ply Rating): Indicates the tyre's load-carrying capacity. Common on commercial tyres. E.g., 215/75R15 8PR
- XL (Extra Load): Reinforced to carry heavier loads than standard tyres of the same size
- M+S (Mud + Snow): Tread pattern designed for mud and snow traction
- 3PMSF (Three-Peak Mountain Snowflake): Certified for severe snow conditions
How to Find Your Correct Tyre Size
- Check your current tyre sidewall — the size code is printed on the outer edge
- Vehicle door jamb sticker — open the driver's door and look for a label showing recommended tyre size and pressure
- Owner's manual — your vehicle handbook lists the original equipment tyre size
- Ask our experts — visit us on Juja Road, Nairobi, or WhatsApp us with your vehicle make and model
Important: Never mix tyre sizes on the same axle. All four tyres should ideally be the same size, brand, and tread pattern for optimal safety and handling.
Understanding Flotation Sizes (4x4 & SUV Tyres)
Some SUV and 4x4 tyres use a different format called "flotation sizing":
This means the tyre is 33 inches tall, 12.5 inches wide, and fits a 15-inch rim. Common on off-road vehicles and pickups popular in Kenya.
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