Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/35-21 | 255/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.68 (753.9) | 30.04 (763) | 0.36 (9.1) 1.2% |
| Width inches (mm) | 12.4 (315) | 10.04 (255) | -2.36 (-60) -19% |
| Circum. inches (mm) | 93.25 (2368.45) | 94.37 (2397.04) | 1.13 (28.59) 1.2% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 5.02 (127.5) | 0.68 (17.25) 15.6% |
| Revolutions per mile (km) | 679.49 (422.22) | 671.39 (417.18) | -8.1 (-5.04) -1.2% |
255/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.24 mph (32.58 km/h) |
| 25 mph (40.23 km/h) | 25.3 mph (40.72 km/h) |
| 30 mph (48.28 km/h) | 30.36 mph (48.86 km/h) |
| 35 mph (56.33 km/h) | 35.42 mph (57.01 km/h) |
| 40 mph (64.37 km/h) | 40.48 mph (65.15 km/h) |
| 45 mph (72.42 km/h) | 45.54 mph (73.29 km/h) |
| 50 mph (80.47 km/h) | 50.6 mph (81.44 km/h) |
| 55 mph (88.51 km/h) | 55.66 mph (89.58 km/h) |
| 60 mph (96.56 km/h) | 60.72 mph (97.73 km/h) |
| 65 mph (104.61 km/h) | 65.78 mph (105.87 km/h) |
| 70 mph (112.65 km/h) | 70.84 mph (114.01 km/h) |
| 75 mph (120.7 km/h) | 75.91 mph (122.16 km/h) |
| 80 mph (128.75 km/h) | 80.97 mph (130.3 km/h) |
| 85 mph (136.79 km/h) | 86.03 mph (138.45 km/h) |
| 90 mph (144.84 km/h) | 91.09 mph (146.59 km/h) |
| 95 mph (152.89 km/h) | 96.15 mph (154.73 km/h) |
| 100 mph (160.93 km/h) | 101.21 mph (162.88 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1709 | 1985 | 2138 | 2232 | 2334 | 2407 | 2486 | 2581 | 2712 | 2843 | 2988 | 3104 | 3315 | 3548 | 3730 | 3846 | 3912 | 4151 | 4486 | 5213 |
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