Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/60r18 vs 255/35r20 Tire Comparison Side By Side
  235/60-18 255/35-20 Difference
Diameter inches (mm) 29.1 (739.2) 27.03 (686.5) -2.07 (-52.7) -7.1%
Width inches (mm) 9.25 (235) 10.04 (255) 0.79 (20) 8.5%
Circum. inches (mm) 91.43 (2322.27) 84.91 (2156.7) -6.52 (-165.56) -7.1%
Sidewall Height inches (mm) 5.55 (141) 3.51 (89.25) -2.04 (-51.75) -36.7%
Revolutions per mile (km) 693.01 (430.61) 746.21 (463.67) 53.2 (33.06) 7.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.57 mph (29.89 km/h)
25 mph (40.23 km/h)23.22 mph (37.37 km/h)
30 mph (48.28 km/h)27.86 mph (44.84 km/h)
35 mph (56.33 km/h)32.5 mph (52.31 km/h)
40 mph (64.37 km/h)37.15 mph (59.78 km/h)
45 mph (72.42 km/h)41.79 mph (67.26 km/h)
50 mph (80.47 km/h)46.44 mph (74.73 km/h)
55 mph (88.51 km/h)51.08 mph (82.2 km/h)
60 mph (96.56 km/h)55.72 mph (89.68 km/h)
65 mph (104.61 km/h)60.37 mph (97.15 km/h)
70 mph (112.65 km/h)65.01 mph (104.62 km/h)
75 mph (120.7 km/h)69.65 mph (112.1 km/h)
80 mph (128.75 km/h)74.3 mph (119.57 km/h)
85 mph (136.79 km/h)78.94 mph (127.04 km/h)
90 mph (144.84 km/h)83.58 mph (134.52 km/h)
95 mph (152.89 km/h)88.23 mph (141.99 km/h)
100 mph (160.93 km/h)92.87 mph (149.46 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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