The Mickey Thompson Baja Boss A/T is an all-terrain light-truck radial tire in size 33X12.50R18LT, with Load Range E and a 118Q service description.
Size and wheel specifications
- Tire size: 33X12.50R18LT
- Nominal overall diameter: 33 in
- Nominal section width: 12.5 in
- Wheel diameter: 18 in
- Load range: E (10-ply rating)
- Load index / speed rating: 118Q
- Approved rim width range: 8.5–11.0 in
- Measuring rim width: 10.0 in
- Manufacturer-listed overall diameter: 32.6 in
- Manufacturer-listed section width: 11.9 in
- Tread depth: 18.5/32 in
- Sidewall: Black
- Maximum load / inflation rating: 2,910 lb at 65 psi
The 33-inch size designation is nominal. Mickey Thompson lists this tire at 32.6 inches overall diameter and 11.9 inches section width on a 10.0-inch measuring rim. Use the approved 8.5–11.0-inch rim-width range when comparing wheels; the measuring rim is the reference used for the published dimensions.
Before ordering
Compare the complete tire size, load index and speed rating with your vehicle’s approved requirements, then confirm wheel suitability and available clearance. A matching wheel diameter alone does not establish vehicle fitment. If changing from the original tire size or type, have the combination and operating pressure checked by a qualified tire professional.
Questions about 33X12.50R18LT
What does 33X12.50R18LT mean, and is it exactly 33 inches tall?
This flotation size identifies a nominal 33-inch overall diameter, 12.5-inch section width and 18-inch wheel diameter. R denotes radial construction and LT identifies a light-truck tire. The published dimensions for this exact Baja Boss A/T size are 32.6 inches overall diameter and 11.9 inches section width on the 10.0-inch measuring rim.
What wheel width is approved for this 33X12.50R18LT tire?
Mickey Thompson lists an approved rim-width range of 8.5–11.0 inches for this 18-inch tire. The 10.0-inch measuring rim is the reference for the published dimensions; it is not the only approved rim width. Also confirm the wheel is suitable for your vehicle and its required load.
Does Load Range E mean this tire has 10 physical plies?
No. Load Range E corresponds to a 10-ply rating, which describes a strength/load-rating class rather than a count of the tire’s actual cord layers. Use the 118Q service description and the tire’s load/inflation information when comparing this exact size.
Does the 65 psi specification tell me what pressure to run?
No. Mickey Thompson lists the tire’s maximum load as 2,910 lb at 65 psi; this is a load/inflation rating, not a pressure recommendation for every vehicle. Follow the applicable vehicle and tire guidance, and have the operating pressure confirmed when changing tire size or type.
Will this fit any pickup with 18-inch wheels?
No. The 18-inch wheel diameter is only one requirement. Check the full 33X12.50R18LT size, approved 8.5–11.0-inch wheel width, 118Q service description and vehicle clearance. The vehicle’s approved tire specifications and the actual wheel-and-tire combination determine suitability.
