Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/45-20 | 305/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.5) | 30.81 (782.5) | 2.13 (54) 7.4% |
| Width inches (mm) | 9.65 (245) | 12.01 (305) | 2.36 (60) 24.5% |
| Circum. inches (mm) | 90.1 (2288.65) | 96.78 (2458.3) | 6.68 (169.65) 7.4% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 5.4 (137.25) | 1.06 (27) 24.5% |
| Revolutions per mile (km) | 703.18 (436.94) | 654.66 (406.79) | -48.53 (-30.15) -6.9% |
305/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.48 mph (34.57 km/h) |
| 25 mph (40.23 km/h) | 26.85 mph (43.22 km/h) |
| 30 mph (48.28 km/h) | 32.22 mph (51.86 km/h) |
| 35 mph (56.33 km/h) | 37.59 mph (60.5 km/h) |
| 40 mph (64.37 km/h) | 42.96 mph (69.15 km/h) |
| 45 mph (72.42 km/h) | 48.34 mph (77.79 km/h) |
| 50 mph (80.47 km/h) | 53.71 mph (86.43 km/h) |
| 55 mph (88.51 km/h) | 59.08 mph (95.08 km/h) |
| 60 mph (96.56 km/h) | 64.45 mph (103.72 km/h) |
| 65 mph (104.61 km/h) | 69.82 mph (112.36 km/h) |
| 70 mph (112.65 km/h) | 75.19 mph (121 km/h) |
| 75 mph (120.7 km/h) | 80.56 mph (129.65 km/h) |
| 80 mph (128.75 km/h) | 85.93 mph (138.29 km/h) |
| 85 mph (136.79 km/h) | 91.3 mph (146.93 km/h) |
| 90 mph (144.84 km/h) | 96.67 mph (155.58 km/h) |
| 95 mph (152.89 km/h) | 102.04 mph (164.22 km/h) |
| 100 mph (160.93 km/h) | 107.41 mph (172.86 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1666 | 1935 | 2084 | 2176 | 2276 | 2347 | 2425 | 2517 | 2644 | 2772 | 2914 | 3027 | 3233 | 3460 | 3637 | 3750 | 3814 | 4048 | 4374 | 5083 |
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