Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/40r14 vs 185/50r14 Tire Comparison Side By Side
  195/40-14 185/50-14 Difference
Diameter inches (mm) 20.14 (511.6) 21.28 (540.6) 1.14 (29) 5.7%
Width inches (mm) 7.68 (195) 7.28 (185) -0.39 (-10) -5.1%
Circum. inches (mm) 63.28 (1607.24) 66.86 (1698.34) 3.59 (91.11) 5.7%
Sidewall Height inches (mm) 3.07 (78) 3.64 (92.5) 0.57 (14.5) 18.6%
Revolutions per mile (km) 1001.31 (622.18) 947.6 (588.81) -53.71 (-33.38) -5.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.13 mph (34.01 km/h)
25 mph (40.23 km/h)26.42 mph (42.51 km/h)
30 mph (48.28 km/h)31.7 mph (51.02 km/h)
35 mph (56.33 km/h)36.98 mph (59.52 km/h)
40 mph (64.37 km/h)42.27 mph (68.02 km/h)
45 mph (72.42 km/h)47.55 mph (76.53 km/h)
50 mph (80.47 km/h)52.83 mph (85.03 km/h)
55 mph (88.51 km/h)58.12 mph (93.53 km/h)
60 mph (96.56 km/h)63.4 mph (102.03 km/h)
65 mph (104.61 km/h)68.68 mph (110.54 km/h)
70 mph (112.65 km/h)73.97 mph (119.04 km/h)
75 mph (120.7 km/h)79.25 mph (127.54 km/h)
80 mph (128.75 km/h)84.53 mph (136.05 km/h)
85 mph (136.79 km/h)89.82 mph (144.55 km/h)
90 mph (144.84 km/h)95.1 mph (153.05 km/h)
95 mph (152.89 km/h)100.39 mph (161.55 km/h)
100 mph (160.93 km/h)105.67 mph (170.06 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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