295/75R22.5 and 11R22.5 are the two most common Class 8 truck tire sizes in the USA and Canada. Both fit 22.5-inch wheels and are used on tractors and trailers, but they are not identical.
What the numbers mean
- 295/75R22.5 is a metric size: 295 mm section width, a sidewall height that is 75% of the width, radial construction (R), for a 22.5-inch wheel.
- 11R22.5 is a conventional size: about 11 inches section width, radial, for a 22.5-inch wheel. It has a taller sidewall than the 295/75.
How they differ
| 295/75R22.5 | 11R22.5 | |
|---|---|---|
| Width | About 11.6 in | About 11 in |
| Overall diameter | Slightly smaller (about 40 in) | Slightly larger (about 41–42 in) |
| Revolutions per mile | A little higher | A little lower |
| Common use | Long-haul tractors and trailers, many newer specs | Long-haul, regional, vocational, buses |
Exact dimensions and load ratings vary by tire model and load range, so always check the specification sheet and sidewall of the tire you buy.
Which one should you choose?
- Match what the truck was spec'd with. Speedometer calibration, gearing and clearances are set for a particular size.
- Don't mix sizes on the same axle, and match dual tires closely in diameter and pressure.
- Think about your network. If your fleet already runs one size, staying with it simplifies spares and retreads.
- Check load needs. Both sizes are commonly available in load range G and H. Choose the load range that covers your axle weights.
Get both sizes from one supplier
Rio Tires supplies steer, drive and trailer patterns in both sizes. See 295/75R22.5 truck tires and 11R22.5 truck tires, or request pricing.