The Nitto INVO in size 225/45R18 is a summer performance radial tire with service description 91W. Nitto Canada places INVO in its Summer Performance group; the line is designed for performance street use.
Size and wheel specifications
- Tire size: 225/45R18
- Manufacturer stock number: 203280
- Wheel diameter: 18 in
- Nominal section width: 225 mm
- Load index / speed rating: 91W
- Approved rim-width range: 7.0–8.5 in
- Measuring rim width: 7.5 in
- Manufacturer-listed overall diameter: 25.98 in
- Manufacturer-listed overall width: 8.94 in
- Tread depth: 10.0/32 in
- Maximum load / inflation rating: 1,356 lb at 51 psi
Nitto lists this exact stock number at 25.98 inches overall diameter and 8.94 inches overall width on the 7.5-inch measuring rim. The measuring rim is the reference for those published dimensions; the approved rim-width range is 7.0–8.5 inches.
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 225/45R18
What do the numbers in 225/45R18 mean?
The size uses a nominal 225 mm section width and an aspect ratio of 45; 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 25.98 inches overall diameter and 8.94 inches overall width on the 7.5-inch measuring rim.
What wheel width is approved for this 225/45R18 tire?
Nitto lists 7.0–8.5 inches as the approved rim-width range for stock number 203280. Its 7.5-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.
What does the 91W marking tell me?
91 is the tire’s load index and W is its speed symbol. Use the complete size and service description when checking a replacement against the vehicle’s approved requirements; the tire model name alone is not enough.
Is 51 psi the pressure I should run in this tire?
No. The listed 1,356 lb at 51 psi is Nitto’s maximum load/inflation rating. 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.
Is this 225/45R18 Nitto INVO an all-season tire?
No. Nitto Canada classifies INVO in its Summer Performance group. It is a performance street tire for summer use; the model is not presented as an all-season or winter tire. Choose a tire type suitable for your driving conditions as well as the correct size and service description.
