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Westlake
Westlake WESTLAKE SU318 285/50R20/4
Westlake WESTLAKE SU318 285/50R20/4
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Westlake
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Width:
20.00
(in)
Height:
11.22
(in)
Depth:
20.00
(in)
SKU:
24670003
$219.00
Lease-to-own for as low as
/week
Get Started
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Looking for a 285/50R20 high-performance tire? The Westlake SU318 is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
What 285/50R20 means
In the size 285/50R20, 285 is the section width in millimeters (11.22 in), 50 is the aspect ratio — the sidewall stands 50% as tall as the tire is wide, or 142.5 mm (5.61 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 31.22 inches, turning roughly 646 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 20 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 116 — a maximum load of 2,756 lbs per tire. The speed symbol V corresponds to a maximum sustained speed of 149 mph.
Specifications
| Size | 285/50R20/4 |
| Tire Type | High-Performance |
| Service Description | 116V |
| Load Index | 116 |
| Speed Rating | V |
| Load Range | XL |
| Section Width (mm) | 285 |
| Aspect Ratio | 50 |
| Overall Diameter (in) | 20 |
| Tread Depth (/32") | 11 |
| Treadwear | 500 |
| Traction Grade | A |
| Temperature Grade | A |
| UTQG | 500AA |
| Warranty | 50K |
Frequently asked questions
What kind of tire is the Westlake SU318?
The Westlake SU318 in 285/50R20 is a high-performance tire.
What are the treadwear and warranty ratings on the Westlake SU318?
This tire carries a treadwear grade of 500, traction grade A, temperature grade A under UTQG. The manufacturer's warranty is 50K.
What does 116V mean on the Westlake SU318?
116V breaks down as load index 116 — rated for 2,756 lbs per tire — with a V speed rating, good for a maximum sustained 149 mph.
Keep shopping
See every Westlake SU318 size, or view all tires at ThreePiece.us.
- BRAND:
- Westlake
- Model:
- WESTLAKE SU318
- Size:
- 285/50R20/4
- Aspect Ratio:
- 50
- Load Index:
- 116
- Load Range:
- XL
- Section Width:
- 285
- Service Description:
- 116V
- Speed Index:
- V
- Temperature:
- A
- Tire Rim Diameter:
- 20
- Tire Type:
- High-Performance
- Traction:
- A
- Tread Wear:
- 500
- Tread Depth:
- 11
- UQTG:
- 500AA
- Warranty:
- 50K
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