Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/50-18 | 255/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.22 (742.2) | 29.04 (737.7) | -0.18 (-4.5) -0.6% |
| Width inches (mm) | 11.22 (285) | 10.04 (255) | -1.18 (-30) -10.5% |
| Circum. inches (mm) | 91.8 (2331.69) | 91.24 (2317.55) | -0.56 (-14.14) -0.6% |
| Sidewall Height inches (mm) | 5.61 (142.5) | 5.52 (140.25) | -0.09 (-2.25) -1.6% |
| Revolutions per mile (km) | 690.2 (428.87) | 694.42 (431.49) | 4.21 (2.62) 0.6% |
255/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.88 mph (31.99 km/h) |
| 25 mph (40.23 km/h) | 24.85 mph (39.99 km/h) |
| 30 mph (48.28 km/h) | 29.82 mph (47.99 km/h) |
| 35 mph (56.33 km/h) | 34.79 mph (55.99 km/h) |
| 40 mph (64.37 km/h) | 39.76 mph (63.98 km/h) |
| 45 mph (72.42 km/h) | 44.73 mph (71.98 km/h) |
| 50 mph (80.47 km/h) | 49.7 mph (79.98 km/h) |
| 55 mph (88.51 km/h) | 54.67 mph (87.98 km/h) |
| 60 mph (96.56 km/h) | 59.64 mph (95.98 km/h) |
| 65 mph (104.61 km/h) | 64.61 mph (103.97 km/h) |
| 70 mph (112.65 km/h) | 69.58 mph (111.97 km/h) |
| 75 mph (120.7 km/h) | 74.55 mph (119.97 km/h) |
| 80 mph (128.75 km/h) | 79.51 mph (127.97 km/h) |
| 85 mph (136.79 km/h) | 84.48 mph (135.97 km/h) |
| 90 mph (144.84 km/h) | 89.45 mph (143.96 km/h) |
| 95 mph (152.89 km/h) | 94.42 mph (151.96 km/h) |
| 100 mph (160.93 km/h) | 99.39 mph (159.96 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1767 | 2053 | 2211 | 2309 | 2414 | 2489 | 2572 | 2670 | 2805 | 2940 | 3091 | 3211 | 3429 | 3670 | 3858 | 3978 | 4046 | 4294 | 4640 | 5392 |
Better Fuel Economy Factory Ratios Increased Power
