Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/90r17 vs 165/90r18 Tire Comparison Side By Side
  165/90-17 165/90-18 Difference
Diameter inches (mm) 28.69 (728.8) 29.69 (754.2) 1 (25.4) 3.5%
Width inches (mm) 6.5 (165) 6.5 (165) 0 (0) 0%
Circum. inches (mm) 90.14 (2289.59) 93.28 (2369.39) 3.14 (79.8) 3.5%
Sidewall Height inches (mm) 5.85 (148.5) 5.85 (148.5) 0 (0) 0%
Revolutions per mile (km) 702.9 (436.76) 679.22 (422.05) -23.67 (-14.71) -3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.7 mph (33.31 km/h)
25 mph (40.23 km/h)25.87 mph (41.64 km/h)
30 mph (48.28 km/h)31.05 mph (49.96 km/h)
35 mph (56.33 km/h)36.22 mph (58.29 km/h)
40 mph (64.37 km/h)41.39 mph (66.62 km/h)
45 mph (72.42 km/h)46.57 mph (74.94 km/h)
50 mph (80.47 km/h)51.74 mph (83.27 km/h)
55 mph (88.51 km/h)56.92 mph (91.6 km/h)
60 mph (96.56 km/h)62.09 mph (99.93 km/h)
65 mph (104.61 km/h)67.27 mph (108.25 km/h)
70 mph (112.65 km/h)72.44 mph (116.58 km/h)
75 mph (120.7 km/h)77.61 mph (124.91 km/h)
80 mph (128.75 km/h)82.79 mph (133.23 km/h)
85 mph (136.79 km/h)87.96 mph (141.56 km/h)
90 mph (144.84 km/h)93.14 mph (149.89 km/h)
95 mph (152.89 km/h)98.31 mph (158.22 km/h)
100 mph (160.93 km/h)103.49 mph (166.54 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
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
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