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 225/60r15 Tire Comparison Side By Side
  245/60-15 225/60-15 Difference
Diameter inches (mm) 26.57 (675) 25.63 (651) -0.94 (-24) -3.6%
Width inches (mm) 9.65 (245) 8.86 (225) -0.79 (-20) -8.2%
Circum. inches (mm) 83.49 (2120.58) 80.52 (2045.18) -2.97 (-75.4) -3.6%
Sidewall Height inches (mm) 5.79 (147) 5.31 (135) -0.47 (-12) -8.2%
Revolutions per mile (km) 758.92 (471.57) 786.9 (488.95) 27.98 (17.39) 3.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.29 mph (31.04 km/h)
25 mph (40.23 km/h)24.11 mph (38.8 km/h)
30 mph (48.28 km/h)28.93 mph (46.56 km/h)
35 mph (56.33 km/h)33.76 mph (54.32 km/h)
40 mph (64.37 km/h)38.58 mph (62.09 km/h)
45 mph (72.42 km/h)43.4 mph (69.85 km/h)
50 mph (80.47 km/h)48.22 mph (77.61 km/h)
55 mph (88.51 km/h)53.04 mph (85.37 km/h)
60 mph (96.56 km/h)57.87 mph (93.13 km/h)
65 mph (104.61 km/h)62.69 mph (100.89 km/h)
70 mph (112.65 km/h)67.51 mph (108.65 km/h)
75 mph (120.7 km/h)72.33 mph (116.41 km/h)
80 mph (128.75 km/h)77.16 mph (124.17 km/h)
85 mph (136.79 km/h)81.98 mph (131.93 km/h)
90 mph (144.84 km/h)86.8 mph (139.69 km/h)
95 mph (152.89 km/h)91.62 mph (147.45 km/h)
100 mph (160.93 km/h)96.44 mph (155.21 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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