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Toyo
Toyo TOY Proxes RR 315/30ZR18
Toyo TOY Proxes RR 315/30ZR18
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The Toyo Proxes RR in 315/30R18 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 315/30R18 means
In the size 315/30R18, 315 is the section width in millimeters (12.40 in), 30 is the aspect ratio — the sidewall stands 30% as tall as the tire is wide, or 94.5 mm (3.72 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 25.44 inches, turning roughly 793 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 18 inches — when clearance is tight, go by the published figure rather than the nominal size math.
Specifications
| Size | 315/30ZR18 |
| Tire Type | Competition |
| Load Range | SL |
| Section Width (mm) | 315 |
| Aspect Ratio | 30 |
| Overall Diameter (in) | 18 |
| Tread Depth (/32") | 3.7 |
| Treadwear | 40 |
| Traction Grade | C |
| Temperature Grade | A |
| UTQG | 40CA |
Frequently asked questions
What kind of tire is the Toyo Proxes RR?
The Toyo Proxes RR in 315/30R18 is a competition tire.
What are the treadwear and warranty ratings on the Toyo Proxes RR?
This tire carries a treadwear grade of 40, traction grade C, temperature grade A under UTQG.
Will 315/30R18 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 315/30R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.
Keep shopping
See every Toyo Proxes RR size, or view all tires at ThreePiece.us.
- BRAND:
- Toyo
- Model:
- TOY Proxes RR
- Size:
- 315/30ZR18
- Aspect Ratio:
- 30
- Load Index:
- N/A
- Load Range:
- SL
- Section Width:
- 315
- Service Description:
- N/A
- Speed Index:
- N/A
- Temperature:
- A
- Tire Rim Diameter:
- 18
- Tire Type:
- Competition
- Traction:
- C
- Tread Wear:
- 40
- Tread Depth:
- 3.7
- UQTG:
- 40CA
- Warranty:
- N/A
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