Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/55r15 vs 195/50r15 Tire Comparison Side By Side
  195/55-15 195/50-15 Difference
Diameter inches (mm) 23.44 (595.5) 22.68 (576) -0.77 (-19.5) -3.3%
Width inches (mm) 7.68 (195) 7.68 (195) 0 (0) 0%
Circum. inches (mm) 73.65 (1870.82) 71.24 (1809.56) -2.41 (-61.26) -3.3%
Sidewall Height inches (mm) 4.22 (107.25) 3.84 (97.5) -0.38 (-9.75) -9.1%
Revolutions per mile (km) 860.24 (534.52) 889.36 (552.62) 29.12 (18.1) 3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.35 mph (31.13 km/h)
25 mph (40.23 km/h)24.18 mph (38.92 km/h)
30 mph (48.28 km/h)29.02 mph (46.7 km/h)
35 mph (56.33 km/h)33.85 mph (54.48 km/h)
40 mph (64.37 km/h)38.69 mph (62.27 km/h)
45 mph (72.42 km/h)43.53 mph (70.05 km/h)
50 mph (80.47 km/h)48.36 mph (77.83 km/h)
55 mph (88.51 km/h)53.2 mph (85.62 km/h)
60 mph (96.56 km/h)58.04 mph (93.4 km/h)
65 mph (104.61 km/h)62.87 mph (101.18 km/h)
70 mph (112.65 km/h)67.71 mph (108.97 km/h)
75 mph (120.7 km/h)72.54 mph (116.75 km/h)
80 mph (128.75 km/h)77.38 mph (124.53 km/h)
85 mph (136.79 km/h)82.22 mph (132.32 km/h)
90 mph (144.84 km/h)87.05 mph (140.1 km/h)
95 mph (152.89 km/h)91.89 mph (147.88 km/h)
100 mph (160.93 km/h)96.73 mph (155.66 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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