Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/60r18 vs 265/60r20 Tire Comparison Side By Side
  285/60-18 265/60-20 Difference
Diameter inches (mm) 31.46 (799.2) 32.52 (826) 1.06 (26.8) 3.4%
Width inches (mm) 11.22 (285) 10.43 (265) -0.79 (-20) -7%
Circum. inches (mm) 98.85 (2510.76) 102.16 (2594.96) 3.31 (84.19) 3.4%
Sidewall Height inches (mm) 6.73 (171) 6.26 (159) -0.47 (-12) -7%
Revolutions per mile (km) 640.98 (398.28) 620.18 (385.36) -20.8 (-12.92) -3.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.67 mph (33.27 km/h)
25 mph (40.23 km/h)25.84 mph (41.58 km/h)
30 mph (48.28 km/h)31.01 mph (49.9 km/h)
35 mph (56.33 km/h)36.17 mph (58.22 km/h)
40 mph (64.37 km/h)41.34 mph (66.53 km/h)
45 mph (72.42 km/h)46.51 mph (74.85 km/h)
50 mph (80.47 km/h)51.68 mph (83.17 km/h)
55 mph (88.51 km/h)56.84 mph (91.48 km/h)
60 mph (96.56 km/h)62.01 mph (99.8 km/h)
65 mph (104.61 km/h)67.18 mph (108.12 km/h)
70 mph (112.65 km/h)72.35 mph (116.43 km/h)
75 mph (120.7 km/h)77.52 mph (124.75 km/h)
80 mph (128.75 km/h)82.68 mph (133.07 km/h)
85 mph (136.79 km/h)87.85 mph (141.38 km/h)
90 mph (144.84 km/h)93.02 mph (149.7 km/h)
95 mph (152.89 km/h)98.19 mph (158.01 km/h)
100 mph (160.93 km/h)103.35 mph (166.33 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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