Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/35-18 | 285/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.41 (670.7) | 26.98 (685.2) | 0.57 (14.5) 2.2% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 82.96 (2107.07) | 84.75 (2152.62) | 1.79 (45.55) 2.2% |
| Sidewall Height inches (mm) | 4.2 (106.75) | 4.49 (114) | 0.29 (7.25) 6.8% |
| Revolutions per mile (km) | 763.78 (474.59) | 747.62 (464.55) | -16.16 (-10.04) -2.1% |
285/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.43 mph (32.88 km/h) |
| 25 mph (40.23 km/h) | 25.54 mph (41.1 km/h) |
| 30 mph (48.28 km/h) | 30.65 mph (49.32 km/h) |
| 35 mph (56.33 km/h) | 35.76 mph (57.54 km/h) |
| 40 mph (64.37 km/h) | 40.86 mph (65.77 km/h) |
| 45 mph (72.42 km/h) | 45.97 mph (73.99 km/h) |
| 50 mph (80.47 km/h) | 51.08 mph (82.21 km/h) |
| 55 mph (88.51 km/h) | 56.19 mph (90.43 km/h) |
| 60 mph (96.56 km/h) | 61.3 mph (98.65 km/h) |
| 65 mph (104.61 km/h) | 66.41 mph (106.87 km/h) |
| 70 mph (112.65 km/h) | 71.51 mph (115.09 km/h) |
| 75 mph (120.7 km/h) | 76.62 mph (123.31 km/h) |
| 80 mph (128.75 km/h) | 81.73 mph (131.53 km/h) |
| 85 mph (136.79 km/h) | 86.84 mph (139.75 km/h) |
| 90 mph (144.84 km/h) | 91.95 mph (147.97 km/h) |
| 95 mph (152.89 km/h) | 97.05 mph (156.19 km/h) |
| 100 mph (160.93 km/h) | 102.16 mph (164.41 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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