Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/55r17 vs 215/55r17 Tire Comparison Side By Side
  235/55-17 215/55-17 Difference
Diameter inches (mm) 27.18 (690.3) 26.31 (668.3) -0.87 (-22) -3.2%
Width inches (mm) 9.25 (235) 8.46 (215) -0.79 (-20) -8.5%
Circum. inches (mm) 85.38 (2168.64) 82.66 (2099.53) -2.72 (-69.12) -3.2%
Sidewall Height inches (mm) 5.09 (129.25) 4.66 (118.25) -0.43 (-11) -8.5%
Revolutions per mile (km) 742.1 (461.12) 766.53 (476.3) 24.43 (15.18) 3.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.36 mph (31.16 km/h)
25 mph (40.23 km/h)24.2 mph (38.95 km/h)
30 mph (48.28 km/h)29.04 mph (46.74 km/h)
35 mph (56.33 km/h)33.88 mph (54.53 km/h)
40 mph (64.37 km/h)38.73 mph (62.32 km/h)
45 mph (72.42 km/h)43.57 mph (70.11 km/h)
50 mph (80.47 km/h)48.41 mph (77.9 km/h)
55 mph (88.51 km/h)53.25 mph (85.69 km/h)
60 mph (96.56 km/h)58.09 mph (93.48 km/h)
65 mph (104.61 km/h)62.93 mph (101.27 km/h)
70 mph (112.65 km/h)67.77 mph (109.06 km/h)
75 mph (120.7 km/h)72.61 mph (116.85 km/h)
80 mph (128.75 km/h)77.45 mph (124.64 km/h)
85 mph (136.79 km/h)82.29 mph (132.43 km/h)
90 mph (144.84 km/h)87.13 mph (140.23 km/h)
95 mph (152.89 km/h)91.97 mph (148.02 km/h)
100 mph (160.93 km/h)96.81 mph (155.81 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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