Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/65-18 | 285/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.21 (691.2) | 37.07 (941.7) | 9.86 (250.5) 36.2% |
| Width inches (mm) | 7.09 (180) | 11.22 (285) | 4.13 (105) 58.3% |
| Circum. inches (mm) | 85.49 (2171.47) | 116.47 (2958.44) | 30.98 (786.97) 36.2% |
| Sidewall Height inches (mm) | 4.61 (117) | 9.54 (242.25) | 4.93 (125.25) 107.1% |
| Revolutions per mile (km) | 741.13 (460.52) | 543.98 (338.02) | -197.15 (-122.5) -26.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.25 mph (43.85 km/h) |
| 25 mph (40.23 km/h) | 34.06 mph (54.81 km/h) |
| 30 mph (48.28 km/h) | 40.87 mph (65.78 km/h) |
| 35 mph (56.33 km/h) | 47.68 mph (76.74 km/h) |
| 40 mph (64.37 km/h) | 54.5 mph (87.7 km/h) |
| 45 mph (72.42 km/h) | 61.31 mph (98.67 km/h) |
| 50 mph (80.47 km/h) | 68.12 mph (109.63 km/h) |
| 55 mph (88.51 km/h) | 74.93 mph (120.59 km/h) |
| 60 mph (96.56 km/h) | 81.74 mph (131.56 km/h) |
| 65 mph (104.61 km/h) | 88.56 mph (142.52 km/h) |
| 70 mph (112.65 km/h) | 95.37 mph (153.48 km/h) |
| 75 mph (120.7 km/h) | 102.18 mph (164.44 km/h) |
| 80 mph (128.75 km/h) | 108.99 mph (175.41 km/h) |
| 85 mph (136.79 km/h) | 115.81 mph (186.37 km/h) |
| 90 mph (144.84 km/h) | 122.62 mph (197.33 km/h) |
| 95 mph (152.89 km/h) | 129.43 mph (208.3 km/h) |
| 100 mph (160.93 km/h) | 136.24 mph (219.26 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1384 | 1608 | 1732 | 1808 | 1891 | 1950 | 2015 | 2091 | 2197 | 2303 | 2421 | 2515 | 2686 | 2875 | 3022 | 3116 | 3169 | 3364 | 3635 | 4224 |
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