Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 345/35-18 | 285/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.51 (698.7) | 26.98 (685.2) | -0.53 (-13.5) -1.9% |
| Width inches (mm) | 13.58 (345) | 11.22 (285) | -2.36 (-60) -17.4% |
| Circum. inches (mm) | 86.42 (2195.03) | 84.75 (2152.62) | -1.67 (-42.41) -1.9% |
| Sidewall Height inches (mm) | 4.75 (120.75) | 4.49 (114) | -0.27 (-6.75) -5.6% |
| Revolutions per mile (km) | 733.18 (455.57) | 747.62 (464.55) | 14.45 (8.98) 2% |
285/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.61 mph (31.57 km/h) |
| 25 mph (40.23 km/h) | 24.52 mph (39.46 km/h) |
| 30 mph (48.28 km/h) | 29.42 mph (47.35 km/h) |
| 35 mph (56.33 km/h) | 34.32 mph (55.24 km/h) |
| 40 mph (64.37 km/h) | 39.23 mph (63.13 km/h) |
| 45 mph (72.42 km/h) | 44.13 mph (71.02 km/h) |
| 50 mph (80.47 km/h) | 49.03 mph (78.91 km/h) |
| 55 mph (88.51 km/h) | 53.94 mph (86.8 km/h) |
| 60 mph (96.56 km/h) | 58.84 mph (94.7 km/h) |
| 65 mph (104.61 km/h) | 63.74 mph (102.59 km/h) |
| 70 mph (112.65 km/h) | 68.65 mph (110.48 km/h) |
| 75 mph (120.7 km/h) | 73.55 mph (118.37 km/h) |
| 80 mph (128.75 km/h) | 78.45 mph (126.26 km/h) |
| 85 mph (136.79 km/h) | 83.36 mph (134.15 km/h) |
| 90 mph (144.84 km/h) | 88.26 mph (142.04 km/h) |
| 95 mph (152.89 km/h) | 93.16 mph (149.93 km/h) |
| 100 mph (160.93 km/h) | 98.07 mph (157.83 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 |
Better Fuel Economy Factory Ratios Increased Power
