Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/75r15 vs 225/70r15 Tire Comparison Side By Side
  195/75-15 225/70-15 Difference
Diameter inches (mm) 26.52 (673.5) 27.4 (696) 0.89 (22.5) 3.3%
Width inches (mm) 7.68 (195) 8.86 (225) 1.18 (30) 15.4%
Circum. inches (mm) 83.3 (2115.86) 86.08 (2186.55) 2.78 (70.69) 3.3%
Sidewall Height inches (mm) 5.76 (146.25) 6.2 (157.5) 0.44 (11.25) 7.7%
Revolutions per mile (km) 760.61 (472.62) 736.02 (457.34) -24.59 (-15.28) -3.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.67 mph (33.26 km/h)
25 mph (40.23 km/h)25.84 mph (41.58 km/h)
30 mph (48.28 km/h)31 mph (49.89 km/h)
35 mph (56.33 km/h)36.17 mph (58.21 km/h)
40 mph (64.37 km/h)41.34 mph (66.52 km/h)
45 mph (72.42 km/h)46.5 mph (74.84 km/h)
50 mph (80.47 km/h)51.67 mph (83.16 km/h)
55 mph (88.51 km/h)56.84 mph (91.47 km/h)
60 mph (96.56 km/h)62 mph (99.79 km/h)
65 mph (104.61 km/h)67.17 mph (108.1 km/h)
70 mph (112.65 km/h)72.34 mph (116.42 km/h)
75 mph (120.7 km/h)77.51 mph (124.73 km/h)
80 mph (128.75 km/h)82.67 mph (133.05 km/h)
85 mph (136.79 km/h)87.84 mph (141.36 km/h)
90 mph (144.84 km/h)93.01 mph (149.68 km/h)
95 mph (152.89 km/h)98.17 mph (158 km/h)
100 mph (160.93 km/h)103.34 mph (166.31 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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