NT555R
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Specifications
| Size | P305/40R18 NT555R |
|---|---|
| Width | 305 mm |
| Aspect ratio | 40 |
| Rim diameter | R18 |
| Load index | 106 |
| Speed rating | V |
| UTQG | 100 A A |
|---|---|
| Tread depth | 5/32" |
| Weight | 31.08 lbs |
| Max pressure | 44 psi |
| Severe snow (3PMSF) | No |
| Run-flat | No |
About the Nitto NT555R
The NT555R is a DOT Compliant Competition Drag Radial designed with Additional Flexibility for the Weekend Drag Racer. The NT555R Drag Radial works in unison with the NT555 Summer Performance Street tire, so you can put the Drag Radials on the Rear Axle and the NT555s on the Front Axle.
Features
* Overall construction modified to improve launch performance* Semi-radial construction combined with a unique reinforced package* Tread compound formulation
Benefits
* Designed to achieve a balance between maximum dry performance and occasional street use* Helps provide stability at high track speeds* To achieve a balance between treadwear and drag strip performance
Understanding the P305/40R18 size
In the size code 305/40R18, 305 is the section width in millimetres (about 12"). 40 is the aspect ratio — the sidewall height is 40% of the width, or roughly 122 mm. R18 means radial construction on a 18-inch wheel, giving an approximate overall diameter of 27.6".
The load index 106 means each tire supports up to 2,094 lbs — about 8,376 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 $271.50 per tire, a full set of four costs $1086.00. That is about 14% below the average price of the 2 tires we stock in this size.
Frequently asked questions
What does the tire size 305/40R18 mean?
305 is the section width in millimetres, 40 is the aspect ratio (sidewall height as a percentage of width, about 122 mm), and R18 indicates radial construction for a 18-inch wheel. Overall diameter is approximately 27.6 inches.
What are the load and speed ratings of the Nitto NT555R P305/40R18?
Its load index of 106 allows up to 2,094 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 NT555R P305/40R18 tires cost?
A single tire is $271.50 and a set of four is $1086.00.
Does the NT555R come in other sizes?
Yes — we stock 2 additional NT555R sizes besides P305/40R18. Fit only a size approved for your vehicle.