Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/35-18 | 285/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.68 (677.7) | 26.98 (685.2) | 0.3 (7.5) 1.1% |
| Width inches (mm) | 12.4 (315) | 11.22 (285) | -1.18 (-30) -9.5% |
| Circum. inches (mm) | 83.82 (2129.06) | 84.75 (2152.62) | 0.93 (23.56) 1.1% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 4.49 (114) | 0.15 (3.75) 3.4% |
| Revolutions per mile (km) | 755.9 (469.69) | 747.62 (464.55) | -8.27 (-5.14) -1.1% |
285/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.22 mph (32.54 km/h) |
| 25 mph (40.23 km/h) | 25.28 mph (40.68 km/h) |
| 30 mph (48.28 km/h) | 30.33 mph (48.81 km/h) |
| 35 mph (56.33 km/h) | 35.39 mph (56.95 km/h) |
| 40 mph (64.37 km/h) | 40.44 mph (65.09 km/h) |
| 45 mph (72.42 km/h) | 45.5 mph (73.22 km/h) |
| 50 mph (80.47 km/h) | 50.55 mph (81.36 km/h) |
| 55 mph (88.51 km/h) | 55.61 mph (89.49 km/h) |
| 60 mph (96.56 km/h) | 60.66 mph (97.63 km/h) |
| 65 mph (104.61 km/h) | 65.72 mph (105.77 km/h) |
| 70 mph (112.65 km/h) | 70.77 mph (113.9 km/h) |
| 75 mph (120.7 km/h) | 75.83 mph (122.04 km/h) |
| 80 mph (128.75 km/h) | 80.89 mph (130.17 km/h) |
| 85 mph (136.79 km/h) | 85.94 mph (138.31 km/h) |
| 90 mph (144.84 km/h) | 91 mph (146.44 km/h) |
| 95 mph (152.89 km/h) | 96.05 mph (154.58 km/h) |
| 100 mph (160.93 km/h) | 101.11 mph (162.72 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1903 | 2210 | 2380 | 2485 | 2599 | 2680 | 2769 | 2874 | 3020 | 3166 | 3327 | 3457 | 3692 | 3951 | 4153 | 4283 | 4356 | 4623 | 4995 | 5805 |
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