Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/55r14 vs 195/55r15 Tire Comparison Side By Side
  175/55-14 195/55-15 Difference
Diameter inches (mm) 21.58 (548.1) 23.44 (595.5) 1.87 (47.4) 8.6%
Width inches (mm) 6.89 (175) 7.68 (195) 0.79 (20) 11.4%
Circum. inches (mm) 67.79 (1721.91) 73.65 (1870.82) 5.86 (148.91) 8.6%
Sidewall Height inches (mm) 3.79 (96.25) 4.22 (107.25) 0.43 (11) 11.4%
Revolutions per mile (km) 934.63 (580.75) 860.24 (534.52) -74.39 (-46.23) -8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.73 mph (34.97 km/h)
25 mph (40.23 km/h)27.16 mph (43.71 km/h)
30 mph (48.28 km/h)32.59 mph (52.46 km/h)
35 mph (56.33 km/h)38.03 mph (61.2 km/h)
40 mph (64.37 km/h)43.46 mph (69.94 km/h)
45 mph (72.42 km/h)48.89 mph (78.68 km/h)
50 mph (80.47 km/h)54.32 mph (87.43 km/h)
55 mph (88.51 km/h)59.76 mph (96.17 km/h)
60 mph (96.56 km/h)65.19 mph (104.91 km/h)
65 mph (104.61 km/h)70.62 mph (113.65 km/h)
70 mph (112.65 km/h)76.05 mph (122.4 km/h)
75 mph (120.7 km/h)81.49 mph (131.14 km/h)
80 mph (128.75 km/h)86.92 mph (139.88 km/h)
85 mph (136.79 km/h)92.35 mph (148.62 km/h)
90 mph (144.84 km/h)97.78 mph (157.37 km/h)
95 mph (152.89 km/h)103.22 mph (166.11 km/h)
100 mph (160.93 km/h)108.65 mph (174.85 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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