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Winrun
Winrun R330 255/45ZR18
Winrun R330 255/45ZR18
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The Winrun R330 in 255/45R18 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 255/45R18 means
In the size 255/45R18, 255 is the section width in millimeters (10.04 in), 45 is the aspect ratio — the sidewall stands 45% as tall as the tire is wide, or 114.8 mm (4.52 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 27.04 inches, turning roughly 746 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 103 — a maximum load of 1,929 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.
Specifications
| Size | 255/45ZR18 |
| Service Description | 103W |
| Load Index | 103 |
| Speed Rating | W |
| Load Range | XL |
| Section Width (mm) | 255 |
| Aspect Ratio | 45Z |
| Temperature Grade | ATIRE RIM DIAMETER=18TIRE TYPE=High PerformanceTRACTION=ATREAD WEAR=420TREAD DEPTH=UQTG=420 A AWARRANTY= |
Frequently asked questions
What does 103W mean on the Winrun R330?
103W breaks down as load index 103 — rated for 1,929 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.
Will 255/45R18 tires fit my vehicle?
Check the size molded into your current tire's sidewall or the tire placard inside the driver's door jamb — if it reads 255/45R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.
How fast does this tire ship?
Every order at ThreePiece.us ships free, with fast delivery from a nationwide warehouse network. Affirm financing is available at checkout.
Keep shopping
Browse Winrun tires, see every Winrun R330 size, or view all tires at ThreePiece.us.
- BRAND:
- Winrun
- MODEL:
- R330
- SIZE:
- 255/45ZR18
- ASPECT RATIO:
- 45Z
- LOAD INDEX:
- 103
- LOAD RANGE:
- XL
- SECTION WIDTH:
- 255
- SERVICE DESCRIPTION:
- 103W
- SPEED INDEX:
- W
- TEMPERATURE:
- ATIRE RIM DIAMETER=18TIRE TYPE=High PerformanceTRACTION=ATREAD WEAR=420TREAD DEPTH=UQTG=420 A AWARRANTY=
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