Accepts P-Metric and Inches
120/85-18 | 115/90-18 | Difference | |
---|---|---|---|
Diameter inches (mm) | 26.03 (661.2) | 26.15 (664.2) | 0.12 (3) 0.5% |
Width inches (mm) | 4.72 (120) | 4.53 (115) | -0.2 (-5) -4.2% |
Circum. inches (mm) | 81.78 (2077.22) | 82.15 (2086.65) | 0.37 (9.42) 0.5% |
Sidewall Height inches (mm) | 4.02 (102) | 4.07 (103.5) | 0.06 (1.5) 1.5% |
Revolutions per mile (km) | 774.76 (481.41) | 771.26 (479.24) | -3.5 (-2.17) -0.5% |
Speedometer Difference
Speedo Reading | Actual Speed |
---|---|
20 mph (32.19 km/h) | 20.09 mph (32.33 km/h) |
25 mph (40.23 km/h) | 25.11 mph (40.42 km/h) |
30 mph (48.28 km/h) | 30.14 mph (48.5 km/h) |
35 mph (56.33 km/h) | 35.16 mph (56.58 km/h) |
40 mph (64.37 km/h) | 40.18 mph (64.67 km/h) |
45 mph (72.42 km/h) | 45.2 mph (72.75 km/h) |
50 mph (80.47 km/h) | 50.23 mph (80.83 km/h) |
55 mph (88.51 km/h) | 55.25 mph (88.92 km/h) |
60 mph (96.56 km/h) | 60.27 mph (97 km/h) |
65 mph (104.61 km/h) | 65.29 mph (105.08 km/h) |
70 mph (112.65 km/h) | 70.32 mph (113.17 km/h) |
75 mph (120.7 km/h) | 75.34 mph (121.25 km/h) |
80 mph (128.75 km/h) | 80.36 mph (129.33 km/h) |
85 mph (136.79 km/h) | 85.39 mph (137.42 km/h) |
90 mph (144.84 km/h) | 90.41 mph (145.5 km/h) |
95 mph (152.89 km/h) | 95.43 mph (153.58 km/h) |
100 mph (160.93 km/h) | 100.45 mph (161.66 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 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1963 | 2280 | 2455 | 2564 | 2681 | 2764 | 2856 | 2965 | 3115 | 3266 | 3433 | 3566 | 3808 | 4076 | 4285 | 4418 | 4493 | 4769 | 5153 | 5988 |
Better Fuel Economy Factory Ratios Increased Power