Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/70r13 vs 195/45r15 Tire Comparison Side By Side
  155/70-13 195/45-15 Difference
Diameter inches (mm) 21.54 (547.2) 21.91 (556.5) 0.37 (9.3) 1.7%
Width inches (mm) 6.1 (155) 7.68 (195) 1.57 (40) 25.8%
Circum. inches (mm) 67.68 (1719.08) 68.83 (1748.3) 1.15 (29.22) 1.7%
Sidewall Height inches (mm) 4.27 (108.5) 3.45 (87.75) -0.82 (-20.75) -19.1%
Revolutions per mile (km) 936.17 (581.71) 920.52 (571.98) -15.64 (-9.72) -1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.34 mph (32.73 km/h)
25 mph (40.23 km/h)25.42 mph (40.92 km/h)
30 mph (48.28 km/h)30.51 mph (49.1 km/h)
35 mph (56.33 km/h)35.59 mph (57.28 km/h)
40 mph (64.37 km/h)40.68 mph (65.47 km/h)
45 mph (72.42 km/h)45.76 mph (73.65 km/h)
50 mph (80.47 km/h)50.85 mph (81.83 km/h)
55 mph (88.51 km/h)55.93 mph (90.02 km/h)
60 mph (96.56 km/h)61.02 mph (98.2 km/h)
65 mph (104.61 km/h)66.1 mph (106.39 km/h)
70 mph (112.65 km/h)71.19 mph (114.57 km/h)
75 mph (120.7 km/h)76.27 mph (122.75 km/h)
80 mph (128.75 km/h)81.36 mph (130.94 km/h)
85 mph (136.79 km/h)86.44 mph (139.12 km/h)
90 mph (144.84 km/h)91.53 mph (147.3 km/h)
95 mph (152.89 km/h)96.61 mph (155.49 km/h)
100 mph (160.93 km/h)101.7 mph (163.67 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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