Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/35r20 vs 235/35r20 Tire Comparison Side By Side
  255/35-20 235/35-20 Difference
Diameter inches (mm) 27.03 (686.5) 26.48 (672.5) -0.55 (-14) -2%
Width inches (mm) 10.04 (255) 9.25 (235) -0.79 (-20) -7.8%
Circum. inches (mm) 84.91 (2156.7) 83.18 (2112.72) -1.73 (-43.98) -2%
Sidewall Height inches (mm) 3.51 (89.25) 3.24 (82.25) -0.28 (-7) -7.8%
Revolutions per mile (km) 746.21 (463.67) 761.74 (473.32) 15.53 (9.65) 2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.59 mph (31.53 km/h)
25 mph (40.23 km/h)24.49 mph (39.41 km/h)
30 mph (48.28 km/h)29.39 mph (47.3 km/h)
35 mph (56.33 km/h)34.29 mph (55.18 km/h)
40 mph (64.37 km/h)39.18 mph (63.06 km/h)
45 mph (72.42 km/h)44.08 mph (70.94 km/h)
50 mph (80.47 km/h)48.98 mph (78.83 km/h)
55 mph (88.51 km/h)53.88 mph (86.71 km/h)
60 mph (96.56 km/h)58.78 mph (94.59 km/h)
65 mph (104.61 km/h)63.67 mph (102.47 km/h)
70 mph (112.65 km/h)68.57 mph (110.36 km/h)
75 mph (120.7 km/h)73.47 mph (118.24 km/h)
80 mph (128.75 km/h)78.37 mph (126.12 km/h)
85 mph (136.79 km/h)83.27 mph (134 km/h)
90 mph (144.84 km/h)88.16 mph (141.89 km/h)
95 mph (152.89 km/h)93.06 mph (149.77 km/h)
100 mph (160.93 km/h)97.96 mph (157.65 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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