Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/70r15 vs 245/60r15 Tire Comparison Side By Side
  225/70-15 245/60-15 Difference
Diameter inches (mm) 27.4 (696) 26.57 (675) -0.83 (-21) -3%
Width inches (mm) 8.86 (225) 9.65 (245) 0.79 (20) 8.9%
Circum. inches (mm) 86.08 (2186.55) 83.49 (2120.58) -2.6 (-65.97) -3%
Sidewall Height inches (mm) 6.2 (157.5) 5.79 (147) -0.41 (-10.5) -6.7%
Revolutions per mile (km) 736.02 (457.34) 758.92 (471.57) 22.9 (14.23) 3.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.4 mph (31.22 km/h)
25 mph (40.23 km/h)24.25 mph (39.02 km/h)
30 mph (48.28 km/h)29.09 mph (46.82 km/h)
35 mph (56.33 km/h)33.94 mph (54.63 km/h)
40 mph (64.37 km/h)38.79 mph (62.43 km/h)
45 mph (72.42 km/h)43.64 mph (70.24 km/h)
50 mph (80.47 km/h)48.49 mph (78.04 km/h)
55 mph (88.51 km/h)53.34 mph (85.84 km/h)
60 mph (96.56 km/h)58.19 mph (93.65 km/h)
65 mph (104.61 km/h)63.04 mph (101.45 km/h)
70 mph (112.65 km/h)67.89 mph (109.26 km/h)
75 mph (120.7 km/h)72.74 mph (117.06 km/h)
80 mph (128.75 km/h)77.59 mph (124.86 km/h)
85 mph (136.79 km/h)82.44 mph (132.67 km/h)
90 mph (144.84 km/h)87.28 mph (140.47 km/h)
95 mph (152.89 km/h)92.13 mph (148.27 km/h)
100 mph (160.93 km/h)96.98 mph (156.08 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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