Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/40r15 vs 195/45r15 Tire Comparison Side By Side
  215/40-15 195/45-15 Difference
Diameter inches (mm) 21.77 (553) 21.91 (556.5) 0.14 (3.5) 0.6%
Width inches (mm) 8.46 (215) 7.68 (195) -0.79 (-20) -9.3%
Circum. inches (mm) 68.4 (1737.3) 68.83 (1748.3) 0.43 (11) 0.6%
Sidewall Height inches (mm) 3.39 (86) 3.45 (87.75) 0.07 (1.75) 2%
Revolutions per mile (km) 926.35 (575.6) 920.52 (571.98) -5.83 (-3.62) -0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.13 mph (32.39 km/h)
25 mph (40.23 km/h)25.16 mph (40.49 km/h)
30 mph (48.28 km/h)30.19 mph (48.59 km/h)
35 mph (56.33 km/h)35.22 mph (56.68 km/h)
40 mph (64.37 km/h)40.25 mph (64.78 km/h)
45 mph (72.42 km/h)45.28 mph (72.88 km/h)
50 mph (80.47 km/h)50.32 mph (80.98 km/h)
55 mph (88.51 km/h)55.35 mph (89.07 km/h)
60 mph (96.56 km/h)60.38 mph (97.17 km/h)
65 mph (104.61 km/h)65.41 mph (105.27 km/h)
70 mph (112.65 km/h)70.44 mph (113.37 km/h)
75 mph (120.7 km/h)75.47 mph (121.46 km/h)
80 mph (128.75 km/h)80.51 mph (129.56 km/h)
85 mph (136.79 km/h)85.54 mph (137.66 km/h)
90 mph (144.84 km/h)90.57 mph (145.76 km/h)
95 mph (152.89 km/h)95.6 mph (153.86 km/h)
100 mph (160.93 km/h)100.63 mph (161.95 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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