Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/45-21 | 315/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.74 (780.9) | 32.4 (823) | 1.66 (42.1) 5.4% |
| Width inches (mm) | 10.83 (275) | 12.4 (315) | 1.57 (40) 14.5% |
| Circum. inches (mm) | 96.59 (2453.27) | 101.79 (2585.53) | 5.21 (132.26) 5.4% |
| Sidewall Height inches (mm) | 4.87 (123.75) | 6.2 (157.5) | 1.33 (33.75) 27.3% |
| Revolutions per mile (km) | 656 (407.62) | 622.44 (386.77) | -33.56 (-20.85) -5.1% |
315/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.08 mph (33.92 km/h) |
| 25 mph (40.23 km/h) | 26.35 mph (42.4 km/h) |
| 30 mph (48.28 km/h) | 31.62 mph (50.88 km/h) |
| 35 mph (56.33 km/h) | 36.89 mph (59.36 km/h) |
| 40 mph (64.37 km/h) | 42.16 mph (67.84 km/h) |
| 45 mph (72.42 km/h) | 47.43 mph (76.32 km/h) |
| 50 mph (80.47 km/h) | 52.7 mph (84.81 km/h) |
| 55 mph (88.51 km/h) | 57.97 mph (93.29 km/h) |
| 60 mph (96.56 km/h) | 63.23 mph (101.77 km/h) |
| 65 mph (104.61 km/h) | 68.5 mph (110.25 km/h) |
| 70 mph (112.65 km/h) | 73.77 mph (118.73 km/h) |
| 75 mph (120.7 km/h) | 79.04 mph (127.21 km/h) |
| 80 mph (128.75 km/h) | 84.31 mph (135.69 km/h) |
| 85 mph (136.79 km/h) | 89.58 mph (144.17 km/h) |
| 90 mph (144.84 km/h) | 94.85 mph (152.65 km/h) |
| 95 mph (152.89 km/h) | 100.12 mph (161.13 km/h) |
| 100 mph (160.93 km/h) | 105.39 mph (169.61 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1584 | 1840 | 1982 | 2069 | 2164 | 2231 | 2305 | 2393 | 2514 | 2636 | 2770 | 2878 | 3074 | 3289 | 3458 | 3566 | 3626 | 3849 | 4159 | 4833 |
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