Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/75r13 vs 185/75r14 Tire Comparison Side By Side
  185/75-13 185/75-14 Difference
Diameter inches (mm) 23.93 (607.7) 24.93 (633.1) 1 (25.4) 4.2%
Width inches (mm) 7.28 (185) 7.28 (185) 0 (0) 0%
Circum. inches (mm) 75.16 (1909.15) 78.3 (1988.94) 3.14 (79.8) 4.2%
Sidewall Height inches (mm) 5.46 (138.75) 5.46 (138.75) 0 (0) 0%
Revolutions per mile (km) 842.97 (523.79) 809.15 (502.78) -33.82 (-21.01) -4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.84 mph (33.53 km/h)
25 mph (40.23 km/h)26.04 mph (41.92 km/h)
30 mph (48.28 km/h)31.25 mph (50.3 km/h)
35 mph (56.33 km/h)36.46 mph (58.68 km/h)
40 mph (64.37 km/h)41.67 mph (67.06 km/h)
45 mph (72.42 km/h)46.88 mph (75.45 km/h)
50 mph (80.47 km/h)52.09 mph (83.83 km/h)
55 mph (88.51 km/h)57.3 mph (92.21 km/h)
60 mph (96.56 km/h)62.51 mph (100.6 km/h)
65 mph (104.61 km/h)67.72 mph (108.98 km/h)
70 mph (112.65 km/h)72.93 mph (117.36 km/h)
75 mph (120.7 km/h)78.13 mph (125.75 km/h)
80 mph (128.75 km/h)83.34 mph (134.13 km/h)
85 mph (136.79 km/h)88.55 mph (142.51 km/h)
90 mph (144.84 km/h)93.76 mph (150.9 km/h)
95 mph (152.89 km/h)98.97 mph (159.28 km/h)
100 mph (160.93 km/h)104.18 mph (167.66 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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