A commercial truck tire sidewall carries the information you need to fit, inflate and track the tire. Here's what the main markings mean.
1. Tire size
For example 295/75R22.5 or 11R22.5. This gives the section width, aspect ratio (for metric sizes), radial construction and wheel diameter. See our guide to 295/75R22.5 vs 11R22.5.
2. Load index and speed symbol
A marking like 144/141L shows two load indexes: the first for a single fitment, the second for duals. The letter is the speed symbol. Each load index number corresponds to a maximum load in a standard table.
3. Load range (ply rating)
Truck tires show a load range letter such as G or H. Higher letters mean the tire is rated to carry more weight at a higher inflation pressure.
4. Maximum load and pressure
The sidewall states the maximum load for single and dual use, and the cold inflation pressure needed to carry it. Never exceed the maximum pressure printed on the tire or the wheel's rating.
5. DOT code and date
In the USA, the letters DOT followed by the Tire Identification Number show that the manufacturer certifies the tire meets federal safety standards. The last four digits give the week and year it was made: 2526 means week 25 of 2026.
6. Other markings
- Tubeless: no inner tube required.
- Regroovable: the tread may be regrooved by a trained technician.
- Construction details: the number and type of plies in the tread and sidewall.
Questions about a specific Rio tire's markings? Contact us.