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What 255/40R20 means
In the size 255/40R20, 255 is the section width in millimeters (10.04 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 102.0 mm (4.02 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 28.03 inches, turning roughly 719 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 97 — a maximum load of 1,609 lbs per tire. The speed symbol H corresponds to a maximum sustained speed of 130 mph.
Specifications
| Size | 255/40R20 |
| Tire Type | All Season |
| Service Description | 97H |
| Load Index | 97 |
| Speed Rating | H |
| Load Range | SL |
| Section Width (mm) | 255 |
| Aspect Ratio | 40 |
| Overall Diameter (in) | 28.03 |
| Tread Depth (/32") | 9 |
| Treadwear | 480 |
| Traction Grade | A |
| Temperature Grade | A |
| UTQG | 480AA |
| Warranty | 65K |
Frequently asked questions
What are the treadwear and warranty ratings on the Continental ProContact TX10?
This tire carries a treadwear grade of 480, traction grade A, temperature grade A under UTQG. The manufacturer's warranty is 65K.
What does 97H mean on the Continental ProContact TX10?
97H breaks down as load index 97 — rated for 1,609 lbs per tire — with an H speed rating, good for a maximum sustained 130 mph.
What kind of tire is the Continental ProContact TX10?
The Continental ProContact TX10 in 255/40R20 is a all season tire.
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