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Hankook
Hankook Ventus evo K137 255/40R18XL 99Y - 1031267
Hankook Ventus evo K137 255/40R18XL 99Y - 1031267
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Looking for a 255/40R18 summer tire? The Hankook Ventus evo K137 is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
What 255/40R18 means
In the size 255/40R18, 255 is the section width in millimeters (10.04 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 102.0 mm (4.02 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 26.03 inches, turning roughly 775 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 manufacturer lists the overall diameter of this specific tire as 25.8 inches — when clearance is tight, go by the published figure rather than the nominal size math.
The service description on this tire decodes to a load index of 99 — a maximum load of 1,709 lbs per tire. The speed symbol Y corresponds to a maximum sustained speed of 186 mph.
Load Range E corresponds to a 10-ply rating.
Specifications
| Size | 255/40R18XL |
| Tire Type | Summer |
| Service Description | 99Y |
| Load Index | 99 |
| Speed Rating | Y |
| Load Range | Extra Load |
| Section Width (mm) | 255 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 25.8 |
| Tread Depth (/32") | 7.5 |
| Treadwear | 200 |
| Traction Grade | A |
| Temperature Grade | A |
| UTQG | 200AA |
Frequently asked questions
What kind of tire is the Hankook Ventus evo K137?
The Hankook Ventus evo K137 in 255/40R18 is a summer tire.
What are the treadwear and warranty ratings on the Hankook Ventus evo K137?
This tire carries a treadwear grade of 200, traction grade A, temperature grade A under UTQG.
What does 99Y mean on the Hankook Ventus evo K137?
99Y breaks down as load index 99 — rated for 1,709 lbs per tire — with a Y speed rating, good for a maximum sustained 186 mph.
Keep shopping
Shop all 255/40R18 tires, browse Hankook tires, see every Hankook Ventus evo K137 size, or view all tires at ThreePiece.us.
- BRAND:
- Hankook
- Model:
- Ventus evo K137
- Size:
- 255/40R18XL
- Aspect Ratio:
- 40
- Load Index:
- 99
- Load Range:
- Extra Load
- Section Width:
- 255
- Service Description:
- 99Y
- Speed Index:
- Y
- Temperature:
- A
- Tire Rim Diameter:
- 25.8
- Tire Type:
- Summer
- Traction:
- A
- Tread Wear:
- 200
- Tread Depth:
- 7.5
- UQTG:
- 200AA
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