Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/60r17 vs 215/50r18 Tire Comparison Side By Side
  195/60-17 215/50-18 Difference
Diameter inches (mm) 26.21 (665.8) 26.46 (672.2) 0.25 (6.4) 1%
Width inches (mm) 7.68 (195) 8.46 (215) 0.79 (20) 10.3%
Circum. inches (mm) 82.35 (2091.67) 83.14 (2111.78) 0.79 (20.11) 1%
Sidewall Height inches (mm) 4.61 (117) 4.23 (107.5) -0.37 (-9.5) -8.1%
Revolutions per mile (km) 769.41 (478.09) 762.08 (473.53) -7.33 (-4.55) -1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.19 mph (32.5 km/h)
25 mph (40.23 km/h)25.24 mph (40.62 km/h)
30 mph (48.28 km/h)30.29 mph (48.74 km/h)
35 mph (56.33 km/h)35.34 mph (56.87 km/h)
40 mph (64.37 km/h)40.38 mph (64.99 km/h)
45 mph (72.42 km/h)45.43 mph (73.12 km/h)
50 mph (80.47 km/h)50.48 mph (81.24 km/h)
55 mph (88.51 km/h)55.53 mph (89.36 km/h)
60 mph (96.56 km/h)60.58 mph (97.49 km/h)
65 mph (104.61 km/h)65.62 mph (105.61 km/h)
70 mph (112.65 km/h)70.67 mph (113.74 km/h)
75 mph (120.7 km/h)75.72 mph (121.86 km/h)
80 mph (128.75 km/h)80.77 mph (129.99 km/h)
85 mph (136.79 km/h)85.82 mph (138.11 km/h)
90 mph (144.84 km/h)90.87 mph (146.23 km/h)
95 mph (152.89 km/h)95.91 mph (154.36 km/h)
100 mph (160.93 km/h)100.96 mph (162.48 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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