Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/45-18 | 285/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.74 (704.7) | 26.98 (685.2) | -0.77 (-19.5) -2.8% |
| Width inches (mm) | 10.83 (275) | 11.22 (285) | 0.39 (10) 3.6% |
| Circum. inches (mm) | 87.16 (2213.88) | 84.75 (2152.62) | -2.41 (-61.26) -2.8% |
| Sidewall Height inches (mm) | 4.87 (123.75) | 4.49 (114) | -0.38 (-9.75) -7.9% |
| Revolutions per mile (km) | 726.93 (451.69) | 747.62 (464.55) | 20.69 (12.85) 2.8% |
285/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.45 mph (31.3 km/h) |
| 25 mph (40.23 km/h) | 24.31 mph (39.12 km/h) |
| 30 mph (48.28 km/h) | 29.17 mph (46.94 km/h) |
| 35 mph (56.33 km/h) | 34.03 mph (54.77 km/h) |
| 40 mph (64.37 km/h) | 38.89 mph (62.59 km/h) |
| 45 mph (72.42 km/h) | 43.75 mph (70.42 km/h) |
| 50 mph (80.47 km/h) | 48.62 mph (78.24 km/h) |
| 55 mph (88.51 km/h) | 53.48 mph (86.06 km/h) |
| 60 mph (96.56 km/h) | 58.34 mph (93.89 km/h) |
| 65 mph (104.61 km/h) | 63.2 mph (101.71 km/h) |
| 70 mph (112.65 km/h) | 68.06 mph (109.54 km/h) |
| 75 mph (120.7 km/h) | 72.92 mph (117.36 km/h) |
| 80 mph (128.75 km/h) | 77.79 mph (125.19 km/h) |
| 85 mph (136.79 km/h) | 82.65 mph (133.01 km/h) |
| 90 mph (144.84 km/h) | 87.51 mph (140.83 km/h) |
| 95 mph (152.89 km/h) | 92.37 mph (148.66 km/h) |
| 100 mph (160.93 km/h) | 97.23 mph (156.48 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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