Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/50-20 | 255/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.04 (763) | 28.03 (712) | -2.01 (-51) -6.7% |
| Width inches (mm) | 10.04 (255) | 10.04 (255) | 0 (0) 0% |
| Circum. inches (mm) | 94.37 (2397.04) | 88.06 (2236.81) | -6.31 (-160.22) -6.7% |
| Sidewall Height inches (mm) | 5.02 (127.5) | 4.02 (102) | -1 (-25.5) -20% |
| Revolutions per mile (km) | 671.39 (417.18) | 719.48 (447.06) | 48.09 (29.88) 7.2% |
255/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.66 mph (30.04 km/h) |
| 25 mph (40.23 km/h) | 23.33 mph (37.54 km/h) |
| 30 mph (48.28 km/h) | 27.99 mph (45.05 km/h) |
| 35 mph (56.33 km/h) | 32.66 mph (52.56 km/h) |
| 40 mph (64.37 km/h) | 37.33 mph (60.07 km/h) |
| 45 mph (72.42 km/h) | 41.99 mph (67.58 km/h) |
| 50 mph (80.47 km/h) | 46.66 mph (75.09 km/h) |
| 55 mph (88.51 km/h) | 51.32 mph (82.6 km/h) |
| 60 mph (96.56 km/h) | 55.99 mph (90.11 km/h) |
| 65 mph (104.61 km/h) | 60.66 mph (97.62 km/h) |
| 70 mph (112.65 km/h) | 65.32 mph (105.12 km/h) |
| 75 mph (120.7 km/h) | 69.99 mph (112.63 km/h) |
| 80 mph (128.75 km/h) | 74.65 mph (120.14 km/h) |
| 85 mph (136.79 km/h) | 79.32 mph (127.65 km/h) |
| 90 mph (144.84 km/h) | 83.98 mph (135.16 km/h) |
| 95 mph (152.89 km/h) | 88.65 mph (142.67 km/h) |
| 100 mph (160.93 km/h) | 93.32 mph (150.18 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1831 | 2127 | 2291 | 2392 | 2501 | 2579 | 2665 | 2766 | 2906 | 3046 | 3202 | 3327 | 3553 | 3802 | 3997 | 4122 | 4192 | 4449 | 4807 | 5586 |
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