The Nitto Terra Grappler G3 in size LT275/65R18 is an all-terrain radial tire with service description 123/120S. The Terra Grappler G3 is Nitto’s all-terrain tire for drivers comparing road use and off-road capability.
Size and wheel specifications
- Tire size: LT275/65R18
- Manufacturer stock number: 223890
- Wheel diameter: 18 in
- Nominal section width: 275 mm
- Load index / speed rating: 123/120S
- Load designation: Load Range E (10-ply rating)
- Approved rim-width range: 8.0–9.5 in
- Measuring rim width: 8.0 in
- Manufacturer-listed overall diameter: 32.09 in
- Manufacturer-listed overall width: 10.98 in
- Tread depth: 15.9/32 in
- Maximum load / inflation rating (single-tire application): 3,415 lb at 80 psi
Nitto lists this exact stock number at 32.09 inches overall diameter and 10.98 inches overall width on the 8.0-inch measuring rim. The measuring rim is the reference for those published dimensions; the approved rim-width range is 8.0–9.5 inches.
The 123/120 load index lists 123 for single-tire use and 120 for dual-tire use. These ratings apply to different installation arrangements. The maximum-load figure above is the single-tire rating; do not use it as a dual-installation capacity.
Before ordering
Compare the complete size, load index and speed rating with your vehicle’s approved requirements. Confirm wheel width, wheel load capacity and clearance as well as diameter. A tire’s dimensions do not establish an OEM vehicle application. If changing tire size or type, have the combination and operating pressure checked by a qualified tire professional.
Questions about LT275/65R18
What do the numbers in LT275/65R18 mean?
The size uses a nominal 275 mm section width and an aspect ratio of 65; the sidewall height is expressed as a percentage of that nominal width. R denotes radial construction and 18 is the wheel diameter in inches. Nitto lists this exact tire at 32.09 inches overall diameter and 10.98 inches overall width on the 8.0-inch measuring rim. LT identifies the light-truck size designation.
What wheel width is approved for this LT275/65R18 tire?
Nitto lists 8.0–9.5 inches as the approved rim-width range for stock number 223890. Its 8.0-inch measuring rim is the reference for the published dimensions, not the only approved width. The wheel must also have the correct 18-inch diameter and be suitable for the vehicle and required load.
Does Load Range E mean this tire contains 10 physical plies?
No. Load Range E corresponds to a 10-ply rating, a load/strength classification rather than a count of physical cord layers. This tire’s service description is 123/120S. The load index is 123 in a single-tire application and 120 in a dual-tire application; S is the speed symbol.
Is 80 psi the pressure I should run in this tire?
No. The listed 3,415 lb at 80 psi is Nitto’s maximum load/inflation rating for a single-tire application. It is not a recommended pressure for every vehicle. Follow the applicable vehicle and tire guidance, and have the operating pressure confirmed when changing tire size, type or load requirements.
Will this LT275/65R18 tire fit any vehicle with 18-inch wheels?
No. A matching 18-inch wheel diameter is only one requirement. Check the approved 8.0–9.5-inch rim-width range, complete 123/120S service description, wheel load capacity and vehicle clearance. The published 32.09-inch diameter is useful for comparison, but does not prove vehicle fitment or that a lift or modification is unnecessary.
