Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/85r16 vs 235/75r16 Tire Comparison Side By Side
  225/85-16 235/75-16 Difference
Diameter inches (mm) 31.06 (788.9) 29.88 (758.9) -1.18 (-30) -3.8%
Width inches (mm) 8.86 (225) 9.25 (235) 0.39 (10) 4.4%
Circum. inches (mm) 97.57 (2478.4) 93.86 (2384.15) -3.71 (-94.25) -3.8%
Sidewall Height inches (mm) 7.53 (191.25) 6.94 (176.25) -0.59 (-15) -7.8%
Revolutions per mile (km) 649.35 (403.48) 675.02 (419.44) 25.67 (15.95) 4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.24 mph (30.96 km/h)
25 mph (40.23 km/h)24.05 mph (38.7 km/h)
30 mph (48.28 km/h)28.86 mph (46.44 km/h)
35 mph (56.33 km/h)33.67 mph (54.19 km/h)
40 mph (64.37 km/h)38.48 mph (61.93 km/h)
45 mph (72.42 km/h)43.29 mph (69.67 km/h)
50 mph (80.47 km/h)48.1 mph (77.41 km/h)
55 mph (88.51 km/h)52.91 mph (85.15 km/h)
60 mph (96.56 km/h)57.72 mph (92.89 km/h)
65 mph (104.61 km/h)62.53 mph (100.63 km/h)
70 mph (112.65 km/h)67.34 mph (108.37 km/h)
75 mph (120.7 km/h)72.15 mph (116.11 km/h)
80 mph (128.75 km/h)76.96 mph (123.85 km/h)
85 mph (136.79 km/h)81.77 mph (131.59 km/h)
90 mph (144.84 km/h)86.58 mph (139.33 km/h)
95 mph (152.89 km/h)91.39 mph (147.07 km/h)
100 mph (160.93 km/h)96.2 mph (154.81 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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