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Nitto
Nitto NIT Ridge Grappler 305/55R20
Nitto NIT Ridge Grappler 305/55R20
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Shop the Nitto Ridge Grappler 305/55R20 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 305/55R20 means
In the size 305/55R20, 305 is the section width in millimeters (12.01 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 167.8 mm (6.60 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 33.21 inches, turning roughly 607 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 116 — a maximum load of 2,756 lbs per tire. The speed symbol Q corresponds to a maximum sustained speed of 99 mph.
Specifications
| Size | 305/55R20 |
| Tire Type | All Season |
| Service Description | 116Q |
| Load Index | 116 |
| Speed Rating | Q |
| Load Range | Standard Load |
| Section Width (mm) | 305 |
| Aspect Ratio | 55 |
| Overall Diameter (in) | 33.23 |
| 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 116Q mean on the Nitto Ridge Grappler?
116Q breaks down as load index 116 — rated for 2,756 lbs per tire — with a Q speed rating, good for a maximum sustained 99 mph.
What kind of tire is the Nitto Ridge Grappler?
The Nitto Ridge Grappler in 305/55R20 is a all season tire.
Keep shopping
Shop all 305/55R20 tires, see every Nitto Ridge Grappler size, or view all tires at ThreePiece.us.
- BRAND:
- Nitto
- Model:
- Ridge Grappler
- Size:
- 305/55R20
- Aspect Ratio:
- 55
- Load Index:
- 116
- Load Range:
- Standard Load
- Section Width:
- 305
- Service Description:
- 116Q
- Speed Index:
- Q
- Temperature:
- B
- Tire Rim Diameter:
- 33.23
- Tire Type:
- All Season
- Traction:
- A
- Tread Wear:
- 500
- Tread Depth:
- 13.5
- UQTG:
- 500AB
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