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 155/50r14 Tire Comparison Side By Side
  195/40-14 155/50-14 Difference
Diameter inches (mm) 20.14 (511.6) 20.1 (510.6) -0.04 (-1) -0.2%
Width inches (mm) 7.68 (195) 6.1 (155) -1.57 (-40) -20.5%
Circum. inches (mm) 63.28 (1607.24) 63.15 (1604.1) -0.12 (-3.14) -0.2%
Sidewall Height inches (mm) 3.07 (78) 3.05 (77.5) -0.02 (-0.5) -0.6%
Revolutions per mile (km) 1001.31 (622.18) 1003.27 (623.4) 1.96 (1.22) 0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.96 mph (32.12 km/h)
25 mph (40.23 km/h)24.95 mph (40.16 km/h)
30 mph (48.28 km/h)29.94 mph (48.19 km/h)
35 mph (56.33 km/h)34.93 mph (56.22 km/h)
40 mph (64.37 km/h)39.92 mph (64.25 km/h)
45 mph (72.42 km/h)44.91 mph (72.28 km/h)
50 mph (80.47 km/h)49.9 mph (80.31 km/h)
55 mph (88.51 km/h)54.89 mph (88.34 km/h)
60 mph (96.56 km/h)59.88 mph (96.37 km/h)
65 mph (104.61 km/h)64.87 mph (104.4 km/h)
70 mph (112.65 km/h)69.86 mph (112.43 km/h)
75 mph (120.7 km/h)74.85 mph (120.47 km/h)
80 mph (128.75 km/h)79.84 mph (128.5 km/h)
85 mph (136.79 km/h)84.83 mph (136.53 km/h)
90 mph (144.84 km/h)89.82 mph (144.56 km/h)
95 mph (152.89 km/h)94.81 mph (152.59 km/h)
100 mph (160.93 km/h)99.8 mph (160.62 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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