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 195/55r15 Tire Comparison Side By Side
  195/40-14 195/55-15 Difference
Diameter inches (mm) 20.14 (511.6) 23.44 (595.5) 3.3 (83.9) 16.4%
Width inches (mm) 7.68 (195) 7.68 (195) 0 (0) 0%
Circum. inches (mm) 63.28 (1607.24) 73.65 (1870.82) 10.38 (263.58) 16.4%
Sidewall Height inches (mm) 3.07 (78) 4.22 (107.25) 1.15 (29.25) 37.5%
Revolutions per mile (km) 1001.31 (622.18) 860.24 (534.52) -141.07 (-87.66) -14.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.28 mph (37.47 km/h)
25 mph (40.23 km/h)29.1 mph (46.83 km/h)
30 mph (48.28 km/h)34.92 mph (56.2 km/h)
35 mph (56.33 km/h)40.74 mph (65.56 km/h)
40 mph (64.37 km/h)46.56 mph (74.93 km/h)
45 mph (72.42 km/h)52.38 mph (84.3 km/h)
50 mph (80.47 km/h)58.2 mph (93.66 km/h)
55 mph (88.51 km/h)64.02 mph (103.03 km/h)
60 mph (96.56 km/h)69.84 mph (112.4 km/h)
65 mph (104.61 km/h)75.66 mph (121.76 km/h)
70 mph (112.65 km/h)81.48 mph (131.13 km/h)
75 mph (120.7 km/h)87.3 mph (140.5 km/h)
80 mph (128.75 km/h)93.12 mph (149.86 km/h)
85 mph (136.79 km/h)98.94 mph (159.23 km/h)
90 mph (144.84 km/h)104.76 mph (168.59 km/h)
95 mph (152.89 km/h)110.58 mph (177.96 km/h)
100 mph (160.93 km/h)116.4 mph (187.33 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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