Accepts P-Metric and Inches
305/60-18 | 285/75-18 | Difference | |
---|---|---|---|
Diameter inches (mm) | 32.41 (823.2) | 34.83 (884.7) | 2.42 (61.5) 7.5% |
Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
Circum. inches (mm) | 101.82 (2586.16) | 109.42 (2779.37) | 7.61 (193.21) 7.5% |
Sidewall Height inches (mm) | 7.2 (183) | 8.42 (213.75) | 1.21 (30.75) 16.8% |
Revolutions per mile (km) | 622.29 (386.67) | 579.03 (359.79) | -43.26 (-26.88) -7% |
285/75-18 Tires
Speedometer Difference
Speedo Reading | Actual Speed |
---|---|
20 mph (32.19 km/h) | 21.49 mph (34.59 km/h) |
25 mph (40.23 km/h) | 26.87 mph (43.24 km/h) |
30 mph (48.28 km/h) | 32.24 mph (51.89 km/h) |
35 mph (56.33 km/h) | 37.61 mph (60.54 km/h) |
40 mph (64.37 km/h) | 42.99 mph (69.18 km/h) |
45 mph (72.42 km/h) | 48.36 mph (77.83 km/h) |
50 mph (80.47 km/h) | 53.74 mph (86.48 km/h) |
55 mph (88.51 km/h) | 59.11 mph (95.13 km/h) |
60 mph (96.56 km/h) | 64.48 mph (103.77 km/h) |
65 mph (104.61 km/h) | 69.86 mph (112.42 km/h) |
70 mph (112.65 km/h) | 75.23 mph (121.07 km/h) |
75 mph (120.7 km/h) | 80.6 mph (129.72 km/h) |
80 mph (128.75 km/h) | 85.98 mph (138.37 km/h) |
85 mph (136.79 km/h) | 91.35 mph (147.01 km/h) |
90 mph (144.84 km/h) | 96.72 mph (155.66 km/h) |
95 mph (152.89 km/h) | 102.1 mph (164.31 km/h) |
100 mph (160.93 km/h) | 107.47 mph (172.96 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 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1474 | 1712 | 1843 | 1925 | 2013 | 2075 | 2144 | 2226 | 2339 | 2452 | 2577 | 2677 | 2859 | 3060 | 3217 | 3317 | 3373 | 3580 | 3869 | 4496 |
Better Fuel Economy Factory Ratios Increased Power