Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/45-20 | 305/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.5) | 32.01 (813) | 3.33 (84.5) 11.6% |
| Width inches (mm) | 9.65 (245) | 12.01 (305) | 2.36 (60) 24.5% |
| Circum. inches (mm) | 90.1 (2288.65) | 100.56 (2554.11) | 10.45 (265.46) 11.6% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 6 (152.5) | 1.66 (42.25) 38.3% |
| Revolutions per mile (km) | 703.18 (436.94) | 630.1 (391.52) | -73.09 (-45.41) -10.4% |
305/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.32 mph (35.92 km/h) |
| 25 mph (40.23 km/h) | 27.9 mph (44.9 km/h) |
| 30 mph (48.28 km/h) | 33.48 mph (53.88 km/h) |
| 35 mph (56.33 km/h) | 39.06 mph (62.86 km/h) |
| 40 mph (64.37 km/h) | 44.64 mph (71.84 km/h) |
| 45 mph (72.42 km/h) | 50.22 mph (80.82 km/h) |
| 50 mph (80.47 km/h) | 55.8 mph (89.8 km/h) |
| 55 mph (88.51 km/h) | 61.38 mph (98.78 km/h) |
| 60 mph (96.56 km/h) | 66.96 mph (107.76 km/h) |
| 65 mph (104.61 km/h) | 72.54 mph (116.74 km/h) |
| 70 mph (112.65 km/h) | 78.12 mph (125.72 km/h) |
| 75 mph (120.7 km/h) | 83.7 mph (134.7 km/h) |
| 80 mph (128.75 km/h) | 89.28 mph (143.68 km/h) |
| 85 mph (136.79 km/h) | 94.86 mph (152.66 km/h) |
| 90 mph (144.84 km/h) | 100.44 mph (161.64 km/h) |
| 95 mph (152.89 km/h) | 106.02 mph (170.62 km/h) |
| 100 mph (160.93 km/h) | 111.6 mph (179.6 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1603 | 1863 | 2006 | 2095 | 2190 | 2259 | 2334 | 2422 | 2545 | 2668 | 2804 | 2914 | 3111 | 3330 | 3500 | 3610 | 3671 | 3896 | 4210 | 4892 |
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