Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/80-18 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673.2) | 29.04 (737.5) | 2.53 (64.3) 9.6% |
| Width inches (mm) | 5.31 (135) | 10.04 (255) | 4.72 (120) 88.9% |
| Circum. inches (mm) | 83.26 (2114.92) | 91.22 (2316.92) | 7.95 (202) 9.6% |
| Sidewall Height inches (mm) | 4.25 (108) | 4.52 (114.75) | 0.27 (6.75) 6.2% |
| Revolutions per mile (km) | 760.95 (472.83) | 694.6 (431.61) | -66.34 (-41.22) -8.7% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.91 mph (35.26 km/h) |
| 25 mph (40.23 km/h) | 27.39 mph (44.08 km/h) |
| 30 mph (48.28 km/h) | 32.87 mph (52.89 km/h) |
| 35 mph (56.33 km/h) | 38.34 mph (61.71 km/h) |
| 40 mph (64.37 km/h) | 43.82 mph (70.52 km/h) |
| 45 mph (72.42 km/h) | 49.3 mph (79.34 km/h) |
| 50 mph (80.47 km/h) | 54.78 mph (88.15 km/h) |
| 55 mph (88.51 km/h) | 60.25 mph (96.97 km/h) |
| 60 mph (96.56 km/h) | 65.73 mph (105.78 km/h) |
| 65 mph (104.61 km/h) | 71.21 mph (114.6 km/h) |
| 70 mph (112.65 km/h) | 76.69 mph (123.41 km/h) |
| 75 mph (120.7 km/h) | 82.16 mph (132.23 km/h) |
| 80 mph (128.75 km/h) | 87.64 mph (141.04 km/h) |
| 85 mph (136.79 km/h) | 93.12 mph (149.86 km/h) |
| 90 mph (144.84 km/h) | 98.6 mph (158.68 km/h) |
| 95 mph (152.89 km/h) | 104.07 mph (167.49 km/h) |
| 100 mph (160.93 km/h) | 109.55 mph (176.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1768 | 2053 | 2211 | 2309 | 2415 | 2490 | 2572 | 2670 | 2806 | 2941 | 3091 | 3212 | 3430 | 3671 | 3859 | 3979 | 4047 | 4295 | 4641 | 5393 |
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