Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/40r24 vs 285/45r24 Tire Comparison Side By Side
  285/40-24 285/45-24 Difference
Diameter inches (mm) 32.98 (837.6) 34.1 (866.1) 1.12 (28.5) 3.4%
Width inches (mm) 11.22 (285) 11.22 (285) 0 (0) 0%
Circum. inches (mm) 103.6 (2631.4) 107.12 (2720.93) 3.53 (89.54) 3.4%
Sidewall Height inches (mm) 4.49 (114) 5.05 (128.25) 0.56 (14.25) 12.5%
Revolutions per mile (km) 611.59 (380.03) 591.47 (367.52) -20.13 (-12.51) -3.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.68 mph (33.28 km/h)
25 mph (40.23 km/h)25.85 mph (41.6 km/h)
30 mph (48.28 km/h)31.02 mph (49.92 km/h)
35 mph (56.33 km/h)36.19 mph (58.24 km/h)
40 mph (64.37 km/h)41.36 mph (66.56 km/h)
45 mph (72.42 km/h)46.53 mph (74.88 km/h)
50 mph (80.47 km/h)51.7 mph (83.21 km/h)
55 mph (88.51 km/h)56.87 mph (91.53 km/h)
60 mph (96.56 km/h)62.04 mph (99.85 km/h)
65 mph (104.61 km/h)67.21 mph (108.17 km/h)
70 mph (112.65 km/h)72.38 mph (116.49 km/h)
75 mph (120.7 km/h)77.55 mph (124.81 km/h)
80 mph (128.75 km/h)82.72 mph (133.13 km/h)
85 mph (136.79 km/h)87.89 mph (141.45 km/h)
90 mph (144.84 km/h)93.06 mph (149.77 km/h)
95 mph (152.89 km/h)98.23 mph (158.09 km/h)
100 mph (160.93 km/h)103.4 mph (166.41 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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