Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/65-17 | 255/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.54 (750.3) | 31.05 (788.7) | 1.51 (38.4) 5.1% |
| Width inches (mm) | 9.65 (245) | 10.04 (255) | 0.39 (10) 4.1% |
| Circum. inches (mm) | 92.8 (2357.14) | 97.55 (2477.77) | 4.75 (120.64) 5.1% |
| Sidewall Height inches (mm) | 6.27 (159.25) | 6.53 (165.75) | 0.26 (6.5) 4.1% |
| Revolutions per mile (km) | 682.75 (424.24) | 649.51 (403.59) | -33.24 (-20.66) -4.9% |
255/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.02 mph (33.83 km/h) |
| 25 mph (40.23 km/h) | 26.28 mph (42.29 km/h) |
| 30 mph (48.28 km/h) | 31.54 mph (50.75 km/h) |
| 35 mph (56.33 km/h) | 36.79 mph (59.21 km/h) |
| 40 mph (64.37 km/h) | 42.05 mph (67.67 km/h) |
| 45 mph (72.42 km/h) | 47.3 mph (76.13 km/h) |
| 50 mph (80.47 km/h) | 52.56 mph (84.59 km/h) |
| 55 mph (88.51 km/h) | 57.81 mph (93.04 km/h) |
| 60 mph (96.56 km/h) | 63.07 mph (101.5 km/h) |
| 65 mph (104.61 km/h) | 68.33 mph (109.96 km/h) |
| 70 mph (112.65 km/h) | 73.58 mph (118.42 km/h) |
| 75 mph (120.7 km/h) | 78.84 mph (126.88 km/h) |
| 80 mph (128.75 km/h) | 84.09 mph (135.34 km/h) |
| 85 mph (136.79 km/h) | 89.35 mph (143.8 km/h) |
| 90 mph (144.84 km/h) | 94.61 mph (152.25 km/h) |
| 95 mph (152.89 km/h) | 99.86 mph (160.71 km/h) |
| 100 mph (160.93 km/h) | 105.12 mph (169.17 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1653 | 1920 | 2068 | 2159 | 2258 | 2328 | 2405 | 2497 | 2624 | 2750 | 2891 | 3003 | 3207 | 3432 | 3608 | 3721 | 3784 | 4016 | 4340 | 5043 |
Better Fuel Economy Factory Ratios Increased Power
