Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/65-18 | 315/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.59 (827.7) | 35.36 (898.2) | 2.78 (70.5) 8.5% |
| Width inches (mm) | 11.22 (285) | 12.4 (315) | 1.18 (30) 10.5% |
| Circum. inches (mm) | 102.37 (2600.3) | 111.09 (2821.78) | 8.72 (221.48) 8.5% |
| Sidewall Height inches (mm) | 7.29 (185.25) | 8.68 (220.5) | 1.39 (35.25) 19% |
| Revolutions per mile (km) | 618.91 (384.57) | 570.33 (354.39) | -48.58 (-30.19) -7.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.7 mph (34.93 km/h) |
| 25 mph (40.23 km/h) | 27.13 mph (43.66 km/h) |
| 30 mph (48.28 km/h) | 32.56 mph (52.39 km/h) |
| 35 mph (56.33 km/h) | 37.98 mph (61.12 km/h) |
| 40 mph (64.37 km/h) | 43.41 mph (69.86 km/h) |
| 45 mph (72.42 km/h) | 48.83 mph (78.59 km/h) |
| 50 mph (80.47 km/h) | 54.26 mph (87.32 km/h) |
| 55 mph (88.51 km/h) | 59.68 mph (96.05 km/h) |
| 60 mph (96.56 km/h) | 65.11 mph (104.79 km/h) |
| 65 mph (104.61 km/h) | 70.54 mph (113.52 km/h) |
| 70 mph (112.65 km/h) | 75.96 mph (122.25 km/h) |
| 75 mph (120.7 km/h) | 81.39 mph (130.98 km/h) |
| 80 mph (128.75 km/h) | 86.81 mph (139.71 km/h) |
| 85 mph (136.79 km/h) | 92.24 mph (148.45 km/h) |
| 90 mph (144.84 km/h) | 97.67 mph (157.18 km/h) |
| 95 mph (152.89 km/h) | 103.09 mph (165.91 km/h) |
| 100 mph (160.93 km/h) | 108.52 mph (174.64 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1451 | 1686 | 1816 | 1896 | 1983 | 2044 | 2112 | 2193 | 2304 | 2415 | 2538 | 2637 | 2816 | 3014 | 3168 | 3267 | 3323 | 3527 | 3811 | 4428 |
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