Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
190/55r15 vs 265/40r15 Tire Comparison Side By Side
  190/55-15 265/40-15 Difference
Diameter inches (mm) 23.23 (590) 23.35 (593) 0.12 (3) 0.5%
Width inches (mm) 7.48 (190) 10.43 (265) 2.95 (75) 39.5%
Circum. inches (mm) 72.97 (1853.54) 73.35 (1862.96) 0.37 (9.42) 0.5%
Sidewall Height inches (mm) 4.11 (104.5) 4.17 (106) 0.06 (1.5) 1.4%
Revolutions per mile (km) 868.25 (539.51) 863.86 (536.78) -4.39 (-2.73) -0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.1 mph (32.35 km/h)
25 mph (40.23 km/h)25.13 mph (40.44 km/h)
30 mph (48.28 km/h)30.15 mph (48.53 km/h)
35 mph (56.33 km/h)35.18 mph (56.61 km/h)
40 mph (64.37 km/h)40.2 mph (64.7 km/h)
45 mph (72.42 km/h)45.23 mph (72.79 km/h)
50 mph (80.47 km/h)50.25 mph (80.88 km/h)
55 mph (88.51 km/h)55.28 mph (88.96 km/h)
60 mph (96.56 km/h)60.31 mph (97.05 km/h)
65 mph (104.61 km/h)65.33 mph (105.14 km/h)
70 mph (112.65 km/h)70.36 mph (113.23 km/h)
75 mph (120.7 km/h)75.38 mph (121.31 km/h)
80 mph (128.75 km/h)80.41 mph (129.4 km/h)
85 mph (136.79 km/h)85.43 mph (137.49 km/h)
90 mph (144.84 km/h)90.46 mph (145.58 km/h)
95 mph (152.89 km/h)95.48 mph (153.67 km/h)
100 mph (160.93 km/h)100.51 mph (161.75 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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