Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
240/50r16 vs 225/70r14 Tire Comparison Side By Side
  240/50-16 225/70-14 Difference
Diameter inches (mm) 25.45 (646.4) 26.4 (670.6) 0.95 (24.2) 3.7%
Width inches (mm) 9.45 (240) 8.86 (225) -0.59 (-15) -6.3%
Circum. inches (mm) 79.95 (2030.73) 82.94 (2106.75) 2.99 (76.03) 3.7%
Sidewall Height inches (mm) 4.72 (120) 6.2 (157.5) 1.48 (37.5) 31.3%
Revolutions per mile (km) 792.5 (492.43) 763.9 (474.66) -28.6 (-17.77) -3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.75 mph (33.39 km/h)
25 mph (40.23 km/h)25.94 mph (41.74 km/h)
30 mph (48.28 km/h)31.12 mph (50.09 km/h)
35 mph (56.33 km/h)36.31 mph (58.44 km/h)
40 mph (64.37 km/h)41.5 mph (66.78 km/h)
45 mph (72.42 km/h)46.68 mph (75.13 km/h)
50 mph (80.47 km/h)51.87 mph (83.48 km/h)
55 mph (88.51 km/h)57.06 mph (91.83 km/h)
60 mph (96.56 km/h)62.25 mph (100.18 km/h)
65 mph (104.61 km/h)67.43 mph (108.52 km/h)
70 mph (112.65 km/h)72.62 mph (116.87 km/h)
75 mph (120.7 km/h)77.81 mph (125.22 km/h)
80 mph (128.75 km/h)83 mph (133.57 km/h)
85 mph (136.79 km/h)88.18 mph (141.92 km/h)
90 mph (144.84 km/h)93.37 mph (150.26 km/h)
95 mph (152.89 km/h)98.56 mph (158.61 km/h)
100 mph (160.93 km/h)103.74 mph (166.96 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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