Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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185/60r15 vs 175/65r14 Tire Comparison Side By Side
  185/60-15 175/65-14 Difference
Diameter inches (mm) 23.74 (603) 22.96 (583.1) -0.78 (-19.9) -3.3%
Width inches (mm) 7.28 (185) 6.89 (175) -0.39 (-10) -5.4%
Circum. inches (mm) 74.58 (1894.38) 72.12 (1831.86) -2.46 (-62.52) -3.3%
Sidewall Height inches (mm) 4.37 (111) 4.48 (113.75) 0.11 (2.75) 2.5%
Revolutions per mile (km) 849.54 (527.88) 878.53 (545.89) 28.99 (18.02) 3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.34 mph (31.12 km/h)
25 mph (40.23 km/h)24.17 mph (38.91 km/h)
30 mph (48.28 km/h)29.01 mph (46.69 km/h)
35 mph (56.33 km/h)33.84 mph (54.47 km/h)
40 mph (64.37 km/h)38.68 mph (62.25 km/h)
45 mph (72.42 km/h)43.51 mph (70.03 km/h)
50 mph (80.47 km/h)48.35 mph (77.81 km/h)
55 mph (88.51 km/h)53.18 mph (85.59 km/h)
60 mph (96.56 km/h)58.02 mph (93.37 km/h)
65 mph (104.61 km/h)62.85 mph (101.16 km/h)
70 mph (112.65 km/h)67.69 mph (108.94 km/h)
75 mph (120.7 km/h)72.52 mph (116.72 km/h)
80 mph (128.75 km/h)77.36 mph (124.5 km/h)
85 mph (136.79 km/h)82.19 mph (132.28 km/h)
90 mph (144.84 km/h)87.03 mph (140.06 km/h)
95 mph (152.89 km/h)91.86 mph (147.84 km/h)
100 mph (160.93 km/h)96.7 mph (155.62 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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