Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/70-18 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.99 (660.2) | 28.68 (728.5) | 2.69 (68.3) 10.3% |
| Width inches (mm) | 5.71 (145) | 9.65 (245) | 3.94 (100) 69% |
| Circum. inches (mm) | 81.66 (2074.08) | 90.1 (2288.65) | 8.45 (214.57) 10.3% |
| Sidewall Height inches (mm) | 4 (101.5) | 4.34 (110.25) | 0.34 (8.75) 8.6% |
| Revolutions per mile (km) | 775.93 (482.14) | 703.18 (436.94) | -72.75 (-45.2) -9.4% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.07 mph (35.52 km/h) |
| 25 mph (40.23 km/h) | 27.59 mph (44.4 km/h) |
| 30 mph (48.28 km/h) | 33.1 mph (53.28 km/h) |
| 35 mph (56.33 km/h) | 38.62 mph (62.15 km/h) |
| 40 mph (64.37 km/h) | 44.14 mph (71.03 km/h) |
| 45 mph (72.42 km/h) | 49.66 mph (79.91 km/h) |
| 50 mph (80.47 km/h) | 55.17 mph (88.79 km/h) |
| 55 mph (88.51 km/h) | 60.69 mph (97.67 km/h) |
| 60 mph (96.56 km/h) | 66.21 mph (106.55 km/h) |
| 65 mph (104.61 km/h) | 71.72 mph (115.43 km/h) |
| 70 mph (112.65 km/h) | 77.24 mph (124.31 km/h) |
| 75 mph (120.7 km/h) | 82.76 mph (133.19 km/h) |
| 80 mph (128.75 km/h) | 88.28 mph (142.07 km/h) |
| 85 mph (136.79 km/h) | 93.79 mph (150.95 km/h) |
| 90 mph (144.84 km/h) | 99.31 mph (159.83 km/h) |
| 95 mph (152.89 km/h) | 104.83 mph (168.7 km/h) |
| 100 mph (160.93 km/h) | 110.35 mph (177.58 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1789 | 2079 | 2239 | 2338 | 2444 | 2520 | 2604 | 2703 | 2840 | 2977 | 3130 | 3252 | 3472 | 3716 | 3906 | 4028 | 4097 | 4348 | 4698 | 5460 |
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