Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/82r13 vs 185/50r16 Tire Comparison Side By Side
  165/82-13 185/50-16 Difference
Diameter inches (mm) 23.65 (600.8) 23.28 (591.4) -0.37 (-9.4) -1.6%
Width inches (mm) 6.5 (165) 7.28 (185) 0.79 (20) 12.1%
Circum. inches (mm) 74.31 (1887.47) 73.15 (1857.94) -1.16 (-29.53) -1.6%
Sidewall Height inches (mm) 5.33 (135.3) 3.64 (92.5) -1.69 (-42.8) -31.6%
Revolutions per mile (km) 852.65 (529.81) 866.2 (538.23) 13.55 (8.42) 1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.69 mph (31.68 km/h)
25 mph (40.23 km/h)24.61 mph (39.6 km/h)
30 mph (48.28 km/h)29.53 mph (47.53 km/h)
35 mph (56.33 km/h)34.45 mph (55.45 km/h)
40 mph (64.37 km/h)39.37 mph (63.37 km/h)
45 mph (72.42 km/h)44.3 mph (71.29 km/h)
50 mph (80.47 km/h)49.22 mph (79.21 km/h)
55 mph (88.51 km/h)54.14 mph (87.13 km/h)
60 mph (96.56 km/h)59.06 mph (95.05 km/h)
65 mph (104.61 km/h)63.98 mph (102.97 km/h)
70 mph (112.65 km/h)68.9 mph (110.89 km/h)
75 mph (120.7 km/h)73.83 mph (118.81 km/h)
80 mph (128.75 km/h)78.75 mph (126.73 km/h)
85 mph (136.79 km/h)83.67 mph (134.65 km/h)
90 mph (144.84 km/h)88.59 mph (142.58 km/h)
95 mph (152.89 km/h)93.51 mph (150.5 km/h)
100 mph (160.93 km/h)98.44 mph (158.42 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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