Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/60r13 vs 175/70r13 Tire Comparison Side By Side
  185/60-13 175/70-13 Difference
Diameter inches (mm) 21.74 (552.2) 22.65 (575.2) 0.91 (23) 4.2%
Width inches (mm) 7.28 (185) 6.89 (175) -0.39 (-10) -5.4%
Circum. inches (mm) 68.3 (1734.79) 71.14 (1807.04) 2.84 (72.26) 4.2%
Sidewall Height inches (mm) 4.37 (111) 4.82 (122.5) 0.45 (11.5) 10.4%
Revolutions per mile (km) 927.69 (576.44) 890.59 (553.39) -37.09 (-23.05) -4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.83 mph (33.53 km/h)
25 mph (40.23 km/h)26.04 mph (41.91 km/h)
30 mph (48.28 km/h)31.25 mph (50.29 km/h)
35 mph (56.33 km/h)36.46 mph (58.67 km/h)
40 mph (64.37 km/h)41.67 mph (67.06 km/h)
45 mph (72.42 km/h)46.87 mph (75.44 km/h)
50 mph (80.47 km/h)52.08 mph (83.82 km/h)
55 mph (88.51 km/h)57.29 mph (92.2 km/h)
60 mph (96.56 km/h)62.5 mph (100.58 km/h)
65 mph (104.61 km/h)67.71 mph (108.96 km/h)
70 mph (112.65 km/h)72.92 mph (117.35 km/h)
75 mph (120.7 km/h)78.12 mph (125.73 km/h)
80 mph (128.75 km/h)83.33 mph (134.11 km/h)
85 mph (136.79 km/h)88.54 mph (142.49 km/h)
90 mph (144.84 km/h)93.75 mph (150.87 km/h)
95 mph (152.89 km/h)98.96 mph (159.26 km/h)
100 mph (160.93 km/h)104.17 mph (167.64 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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