Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/55r16 vs 215/55r16 Tire Comparison Side By Side
  235/55-16 215/55-16 Difference
Diameter inches (mm) 26.18 (664.9) 25.31 (642.9) -0.87 (-22) -3.3%
Width inches (mm) 9.25 (235) 8.46 (215) -0.79 (-20) -8.5%
Circum. inches (mm) 82.24 (2088.84) 79.52 (2019.73) -2.72 (-69.12) -3.3%
Sidewall Height inches (mm) 5.09 (129.25) 4.66 (118.25) -0.43 (-11) -8.5%
Revolutions per mile (km) 770.45 (478.73) 796.81 (495.11) 26.36 (16.38) 3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.34 mph (31.12 km/h)
25 mph (40.23 km/h)24.17 mph (38.9 km/h)
30 mph (48.28 km/h)29.01 mph (46.68 km/h)
35 mph (56.33 km/h)33.84 mph (54.46 km/h)
40 mph (64.37 km/h)38.68 mph (62.24 km/h)
45 mph (72.42 km/h)43.51 mph (70.02 km/h)
50 mph (80.47 km/h)48.35 mph (77.8 km/h)
55 mph (88.51 km/h)53.18 mph (85.59 km/h)
60 mph (96.56 km/h)58.01 mph (93.37 km/h)
65 mph (104.61 km/h)62.85 mph (101.15 km/h)
70 mph (112.65 km/h)67.68 mph (108.93 km/h)
75 mph (120.7 km/h)72.52 mph (116.71 km/h)
80 mph (128.75 km/h)77.35 mph (124.49 km/h)
85 mph (136.79 km/h)82.19 mph (132.27 km/h)
90 mph (144.84 km/h)87.02 mph (140.05 km/h)
95 mph (152.89 km/h)91.86 mph (147.83 km/h)
100 mph (160.93 km/h)96.69 mph (155.61 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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