NT555RII
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Specifications
| Size | P325/50R15 NT555RII (Dot-Compliant) |
|---|---|
| Width | 325 mm |
| Aspect ratio | 50 |
| Rim diameter | R15 |
| Load index | 112 |
| Speed rating | V |
| Load range | SL |
| UTQG | 100 A A |
|---|---|
| Tread depth | 6.3/32" |
| Weight | 35.49 lbs |
| Max pressure | 51 psi |
| Severe snow (3PMSF) | No |
| Run-flat | No |
About the Nitto NT555RII
D.O.T. Compliant Road Race Competition Radial tire designed with the Muscle Car Racer in mind.
Features
* Semi slick shoulder block design* Specifically designed sidewall construction* High modulus polyester carcass, reinforced sidewall and semi-radial body construction* Road race compound
Benefits
* Minimizes heat build up and maximizes cornering grip and turn-in response* Increases steering feedback and precision for driver confidence* Increases stability during braking, cornering and straight-aways* Balances dry traction, consistency, heat cycle performance, heat resistance and longevity
Understanding the P325/50R15 size
In the size code 325/50R15, 325 is the section width in millimetres (about 12.8"). 50 is the aspect ratio — the sidewall height is 50% of the width, or roughly 162.5 mm. R15 means radial construction on a 15-inch wheel, giving an approximate overall diameter of 27.8".
The load index 112 means each tire supports up to 2,469 lbs — about 9,876 lbs across a full set of four. The speed symbol V certifies the tire to 149 mph under its rated load. Always match or exceed the load index and speed rating listed on your vehicle's door-jamb placard.
Tread life and grip ratings
This tire carries a UTQG rating of 100 A A. The treadwear grade of 100 is a relative durability score — a grade of 200 is expected to last roughly twice as long as a grade of 100 under the same controlled test. Traction grade A measures straight-line wet stopping grip (AA is highest, then A, B and C). Temperature grade A reflects heat resistance at sustained speed (A is highest).
Price and value
At $234.75 per tire, a full set of four costs $939.00.
Frequently asked questions
What does the tire size 325/50R15 mean?
325 is the section width in millimetres, 50 is the aspect ratio (sidewall height as a percentage of width, about 162.5 mm), and R15 indicates radial construction for a 15-inch wheel. Overall diameter is approximately 27.8 inches.
What are the load and speed ratings of the Nitto NT555RII P325/50R15?
Its load index of 112 allows up to 2,469 lbs per tire. Its speed rating of V is certified to 149 mph. Check your door-jamb placard and do not fit a tire rated below the vehicle's requirement.
How much does a set of 4 Nitto NT555RII P325/50R15 tires cost?
A single tire is $234.75 and a set of four is $939.00.
Does the NT555RII come in other sizes?
Yes — we stock 28 additional NT555RII sizes besides P325/50R15. Fit only a size approved for your vehicle.