Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/35-21 | 255/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.58 (725.9) | 28.03 (712) | -0.55 (-13.9) -1.9% |
| Width inches (mm) | 10.83 (275) | 10.04 (255) | -0.79 (-20) -7.3% |
| Circum. inches (mm) | 89.78 (2280.48) | 88.06 (2236.81) | -1.72 (-43.67) -1.9% |
| Sidewall Height inches (mm) | 3.79 (96.25) | 4.02 (102) | 0.23 (5.75) 6% |
| Revolutions per mile (km) | 705.7 (438.5) | 719.48 (447.06) | 13.78 (8.56) 2% |
255/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.62 mph (31.57 km/h) |
| 25 mph (40.23 km/h) | 24.52 mph (39.46 km/h) |
| 30 mph (48.28 km/h) | 29.43 mph (47.36 km/h) |
| 35 mph (56.33 km/h) | 34.33 mph (55.25 km/h) |
| 40 mph (64.37 km/h) | 39.23 mph (63.14 km/h) |
| 45 mph (72.42 km/h) | 44.14 mph (71.03 km/h) |
| 50 mph (80.47 km/h) | 49.04 mph (78.93 km/h) |
| 55 mph (88.51 km/h) | 53.95 mph (86.82 km/h) |
| 60 mph (96.56 km/h) | 58.85 mph (94.71 km/h) |
| 65 mph (104.61 km/h) | 63.76 mph (102.6 km/h) |
| 70 mph (112.65 km/h) | 68.66 mph (110.5 km/h) |
| 75 mph (120.7 km/h) | 73.56 mph (118.39 km/h) |
| 80 mph (128.75 km/h) | 78.47 mph (126.28 km/h) |
| 85 mph (136.79 km/h) | 83.37 mph (134.18 km/h) |
| 90 mph (144.84 km/h) | 88.28 mph (142.07 km/h) |
| 95 mph (152.89 km/h) | 93.18 mph (149.96 km/h) |
| 100 mph (160.93 km/h) | 98.09 mph (157.85 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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