Accepts P-Metric and Inches
305/75-20 | 285/65-20 | Difference | |
---|---|---|---|
Diameter inches (mm) | 38.01 (965.5) | 34.59 (878.5) | -3.43 (-87) -9% |
Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
Circum. inches (mm) | 119.42 (3033.21) | 108.66 (2759.89) | -10.76 (-273.32) -9% |
Sidewall Height inches (mm) | 9.01 (228.75) | 7.29 (185.25) | -1.71 (-43.5) -19% |
Revolutions per mile (km) | 530.57 (329.68) | 583.12 (362.33) | 52.54 (32.65) 9.9% |
285/65-20 Tires
Speedometer Difference
Speedo Reading | Actual Speed |
---|---|
20 mph (32.19 km/h) | 18.2 mph (29.29 km/h) |
25 mph (40.23 km/h) | 22.75 mph (36.61 km/h) |
30 mph (48.28 km/h) | 27.3 mph (43.93 km/h) |
35 mph (56.33 km/h) | 31.85 mph (51.25 km/h) |
40 mph (64.37 km/h) | 36.4 mph (58.57 km/h) |
45 mph (72.42 km/h) | 40.95 mph (65.89 km/h) |
50 mph (80.47 km/h) | 45.49 mph (73.22 km/h) |
55 mph (88.51 km/h) | 50.04 mph (80.54 km/h) |
60 mph (96.56 km/h) | 54.59 mph (87.86 km/h) |
65 mph (104.61 km/h) | 59.14 mph (95.18 km/h) |
70 mph (112.65 km/h) | 63.69 mph (102.5 km/h) |
75 mph (120.7 km/h) | 68.24 mph (109.82 km/h) |
80 mph (128.75 km/h) | 72.79 mph (117.15 km/h) |
85 mph (136.79 km/h) | 77.34 mph (124.47 km/h) |
90 mph (144.84 km/h) | 81.89 mph (131.79 km/h) |
95 mph (152.89 km/h) | 86.44 mph (139.11 km/h) |
100 mph (160.93 km/h) | 90.99 mph (146.43 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 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1484 | 1724 | 1856 | 1939 | 2027 | 2090 | 2160 | 2242 | 2355 | 2469 | 2595 | 2696 | 2879 | 3082 | 3239 | 3340 | 3397 | 3606 | 3896 | 4528 |
Better Fuel Economy Factory Ratios Increased Power