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Nitto
Nitto NIT Ridge Grappler 255/55R18XL
Nitto NIT Ridge Grappler 255/55R18XL
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Shop the Nitto Ridge Grappler 255/55R18 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 255/55R18 means
In the size 255/55R18, 255 is the section width in millimeters (10.04 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 140.2 mm (5.52 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 29.04 inches, turning roughly 694 revolutions per mile. Overall diameter is what matters for speedometer accuracy and clearance when you change sizes, so compare it — not just the width — against your current tire.
The service description on this tire decodes to a load index of 109 — a maximum load of 2,271 lbs per tire. The speed symbol T corresponds to a maximum sustained speed of 118 mph.
Load Range E corresponds to a 10-ply rating.
Specifications
| Size | 255/55R18XL |
| Tire Type | All Season |
| Service Description | 109T |
| Load Index | 109 |
| Speed Rating | T |
| Load Range | Extra Load |
| Section Width (mm) | 255 |
| Aspect Ratio | 55 |
| Overall Diameter (in) | 29.02 |
| Tread Depth (/32") | 13.5 |
| Treadwear | 500 |
| Traction Grade | A |
| Temperature Grade | B |
| UTQG | 500AB |
Frequently asked questions
What are the treadwear and warranty ratings on the Nitto Ridge Grappler?
This tire carries a treadwear grade of 500, traction grade A, temperature grade B under UTQG.
What does 109T mean on the Nitto Ridge Grappler?
109T breaks down as load index 109 — rated for 2,271 lbs per tire — with a T speed rating, good for a maximum sustained 118 mph.
What kind of tire is the Nitto Ridge Grappler?
The Nitto Ridge Grappler in 255/55R18 is a all season tire.
Keep shopping
Shop all 255/55R18 tires, see every Nitto Ridge Grappler size, or view all tires at ThreePiece.us.
- Brand:
- Nitto
- Model:
- Ridge Grappler
- Size:
- 255/55R18XL
- Aspect Ratio:
- 55
- Load Index:
- 109
- Load Range:
- Extra Load
- Section Width:
- 255
- Service Description:
- 109T
- Speed Index:
- T
- Temperature:
- B
- Tire Rim Diameter:
- 29.02
- Tire Type:
- All Season
- Traction:
- A
- Tread Wear:
- 500
- Tread Depth:
- 13.5
- UQTG:
- 500AB
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