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Kumho
Kumho KMH Ecsta STX (KL12) 305/50R20
Kumho KMH Ecsta STX (KL12) 305/50R20
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Shop the Kumho Ecsta STX (KL12) 305/50R20 at ThreePiece.us — free shipping on every order, Affirm financing available, and fast delivery nationwide.
What 305/50R20 means
In the size 305/50R20, 305 is the section width in millimeters (12.01 in), 50 is the aspect ratio — the sidewall stands 50% as tall as the tire is wide, or 152.5 mm (6.00 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 32.01 inches, turning roughly 630 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 120 — a maximum load of 3,086 lbs per tire. The speed symbol V corresponds to a maximum sustained speed of 149 mph.
Specifications
| Size | 305/50R20 |
| Tire Type | High Performance |
| Service Description | 120V |
| Load Index | 120 |
| Speed Rating | V |
| Load Range | SL |
| Section Width (mm) | 305 |
| Aspect Ratio | 50 |
| Overall Diameter (in) | 32 |
| Tread Depth (/32") | 11.5 |
| Treadwear | 420 |
| Traction Grade | A |
| Temperature Grade | A |
| UTQG | 420AA |
Frequently asked questions
What are the treadwear and warranty ratings on the Kumho Ecsta STX (KL12)?
This tire carries a treadwear grade of 420, traction grade A, temperature grade A under UTQG.
What does 120V mean on the Kumho Ecsta STX (KL12)?
120V breaks down as load index 120 — rated for 3,086 lbs per tire — with a V speed rating, good for a maximum sustained 149 mph.
What kind of tire is the Kumho Ecsta STX (KL12)?
The Kumho Ecsta STX (KL12) in 305/50R20 is a high performance tire.
Keep shopping
See every Kumho Ecsta STX (KL12) size, or view all tires at ThreePiece.us.
- BRAND:
- Kumho
- Model:
- KMH Ecsta STX (KL12)
- Size:
- 305/50R20
- Aspect Ratio:
- 50
- Load Index:
- 120
- Load Range:
- SL
- Section Width:
- 305
- Service Description:
- 120V
- Speed Index:
- V
- Temperature:
- A
- Tire Rim Diameter:
- 32
- Tire Type:
- High Performance
- Traction:
- A
- Tread Wear:
- 420
- Tread Depth:
- 11.5
- UQTG:
- 420AA
- Warranty:
- N/A
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