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Continental
Continental ProContact RX 235/40R18 91W - 15579290000
Continental ProContact RX 235/40R18 91W - 15579290000
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Shop the Continental ProContact RX 235/40R18 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 235/40R18 means
In the size 235/40R18, 235 is the section width in millimeters (9.25 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 94.0 mm (3.70 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 25.40 inches, turning roughly 794 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 91 — a maximum load of 1,356 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.
Specifications
| Size | 235/40R18 |
| Tire Type | All Season |
| Service Description | 91W |
| Load Index | 91 |
| Speed Rating | W |
| Load Range | SL |
| Section Width (mm) | 235 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 25.4 |
| Tread Depth (/32") | 9 |
| Treadwear | 400 |
| Traction Grade | A |
| Temperature Grade | A |
| UTQG | 400AA |
| Warranty | 40K |
Frequently asked questions
What are the treadwear and warranty ratings on the Continental ProContact RX?
This tire carries a treadwear grade of 400, traction grade A, temperature grade A under UTQG. The manufacturer's warranty is 40K.
What does 91W mean on the Continental ProContact RX?
91W breaks down as load index 91 — rated for 1,356 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.
What kind of tire is the Continental ProContact RX?
The Continental ProContact RX in 235/40R18 is a all season tire.
Keep shopping
Shop all 235/40R18 tires, browse Continental tires, see every Continental ProContact RX size, or view all tires at ThreePiece.us.
- BRAND:
- Continental
- Model:
- ProContact RX
- Size:
- 235/40R18
- Aspect Ratio:
- 40
- Load Index:
- 91
- Load Range:
- SL
- Section Width:
- 235
- Service Description:
- 91W
- Speed Index:
- W
- Temperature:
- A
- Tire Rim Diameter:
- 25.4
- Tire Type:
- All Season
- Traction:
- A
- Tread Wear:
- 400
- Tread Depth:
- 9
- UQTG:
- 400AA
- Warranty:
- 40K
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