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Kumho
Kumho Ecsta PS31 245/40ZR17 91W - 2184803
Kumho Ecsta PS31 245/40ZR17 91W - 2184803
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The Kumho Ecsta PS31 in 245/40R17 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 245/40R17 means
In the size 245/40R17, 245 is the section width in millimeters (9.65 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 98.0 mm (3.86 in) — R denotes radial construction, and 17 is the wheel diameter in inches. That works out to an overall diameter of about 24.72 inches, turning roughly 816 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 | 245/40ZR17 |
| Tire Type | Summer |
| Service Description | 91W |
| Load Index | 91 |
| Speed Rating | W |
| Load Range | Standard Load |
| Section Width (mm) | 245 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 24.7 |
| Tread Depth (/32") | 10.3 |
| Treadwear | 400 |
| Traction Grade | A |
| Temperature Grade | A |
| UTQG | 400AA |
Frequently asked questions
What does 91W mean on the Kumho Ecsta PS31?
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 Kumho Ecsta PS31?
The Kumho Ecsta PS31 in 245/40R17 is a summer tire.
What are the treadwear and warranty ratings on the Kumho Ecsta PS31?
This tire carries a treadwear grade of 400, traction grade A, temperature grade A under UTQG.
Keep shopping
Shop all 245/40R17 tires, browse Kumho tires, see every Kumho Ecsta PS31 size, or view all tires at ThreePiece.us.
- BRAND:
- Kumho
- Model:
- Ecsta PS31
- Size:
- 245/40ZR17
- Aspect Ratio:
- 40
- Load Index:
- 91
- Load Range:
- Standard Load
- Section Width:
- 245
- Service Description:
- 91W
- Speed Index:
- W
- Temperature:
- A
- Tire Rim Diameter:
- 24.7
- Tire Type:
- Summer
- Traction:
- A
- Tread Wear:
- 400
- Tread Depth:
- 10.3
- UQTG:
- 400AA
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