Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/60r15 vs 225/70r15 Tire Comparison Side By Side
  245/60-15 225/70-15 Difference
Diameter inches (mm) 26.57 (675) 27.4 (696) 0.83 (21) 3.1%
Width inches (mm) 9.65 (245) 8.86 (225) -0.79 (-20) -8.2%
Circum. inches (mm) 83.49 (2120.58) 86.08 (2186.55) 2.6 (65.97) 3.1%
Sidewall Height inches (mm) 5.79 (147) 6.2 (157.5) 0.41 (10.5) 7.1%
Revolutions per mile (km) 758.92 (471.57) 736.02 (457.34) -22.9 (-14.23) -3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.62 mph (33.19 km/h)
25 mph (40.23 km/h)25.78 mph (41.49 km/h)
30 mph (48.28 km/h)30.93 mph (49.78 km/h)
35 mph (56.33 km/h)36.09 mph (58.08 km/h)
40 mph (64.37 km/h)41.24 mph (66.38 km/h)
45 mph (72.42 km/h)46.4 mph (74.67 km/h)
50 mph (80.47 km/h)51.56 mph (82.97 km/h)
55 mph (88.51 km/h)56.71 mph (91.27 km/h)
60 mph (96.56 km/h)61.87 mph (99.56 km/h)
65 mph (104.61 km/h)67.02 mph (107.86 km/h)
70 mph (112.65 km/h)72.18 mph (116.16 km/h)
75 mph (120.7 km/h)77.33 mph (124.46 km/h)
80 mph (128.75 km/h)82.49 mph (132.75 km/h)
85 mph (136.79 km/h)87.64 mph (141.05 km/h)
90 mph (144.84 km/h)92.8 mph (149.35 km/h)
95 mph (152.89 km/h)97.96 mph (157.64 km/h)
100 mph (160.93 km/h)103.11 mph (165.94 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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