Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
220/70r14 vs 235/55r15 Tire Comparison Side By Side
  220/70-14 235/55-15 Difference
Diameter inches (mm) 26.13 (663.6) 25.18 (639.5) -0.95 (-24.1) -3.6%
Width inches (mm) 8.66 (220) 9.25 (235) 0.59 (15) 6.8%
Circum. inches (mm) 82.08 (2084.76) 79.1 (2009.05) -2.98 (-75.71) -3.6%
Sidewall Height inches (mm) 6.06 (154) 5.09 (129.25) -0.97 (-24.75) -16.1%
Revolutions per mile (km) 771.96 (479.67) 801.05 (497.75) 29.09 (18.08) 3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.27 mph (31.02 km/h)
25 mph (40.23 km/h)24.09 mph (38.77 km/h)
30 mph (48.28 km/h)28.91 mph (46.53 km/h)
35 mph (56.33 km/h)33.73 mph (54.28 km/h)
40 mph (64.37 km/h)38.55 mph (62.04 km/h)
45 mph (72.42 km/h)43.37 mph (69.79 km/h)
50 mph (80.47 km/h)48.18 mph (77.55 km/h)
55 mph (88.51 km/h)53 mph (85.3 km/h)
60 mph (96.56 km/h)57.82 mph (93.05 km/h)
65 mph (104.61 km/h)62.64 mph (100.81 km/h)
70 mph (112.65 km/h)67.46 mph (108.56 km/h)
75 mph (120.7 km/h)72.28 mph (116.32 km/h)
80 mph (128.75 km/h)77.09 mph (124.07 km/h)
85 mph (136.79 km/h)81.91 mph (131.83 km/h)
90 mph (144.84 km/h)86.73 mph (139.58 km/h)
95 mph (152.89 km/h)91.55 mph (147.34 km/h)
100 mph (160.93 km/h)96.37 mph (155.09 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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