Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/85r16 vs 235/60r16 Tire Comparison Side By Side
  175/85-16 235/60-16 Difference
Diameter inches (mm) 27.71 (703.9) 27.1 (688.4) -0.61 (-15.5) -2.2%
Width inches (mm) 6.89 (175) 9.25 (235) 2.36 (60) 34.3%
Circum. inches (mm) 87.06 (2211.37) 85.14 (2162.67) -1.92 (-48.69) -2.2%
Sidewall Height inches (mm) 5.86 (148.75) 5.55 (141) -0.31 (-7.75) -5.2%
Revolutions per mile (km) 727.76 (452.21) 744.15 (462.39) 16.39 (10.18) 2.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.56 mph (31.48 km/h)
25 mph (40.23 km/h)24.45 mph (39.35 km/h)
30 mph (48.28 km/h)29.34 mph (47.22 km/h)
35 mph (56.33 km/h)34.23 mph (55.09 km/h)
40 mph (64.37 km/h)39.12 mph (62.96 km/h)
45 mph (72.42 km/h)44.01 mph (70.83 km/h)
50 mph (80.47 km/h)48.9 mph (78.7 km/h)
55 mph (88.51 km/h)53.79 mph (86.56 km/h)
60 mph (96.56 km/h)58.68 mph (94.43 km/h)
65 mph (104.61 km/h)63.57 mph (102.3 km/h)
70 mph (112.65 km/h)68.46 mph (110.17 km/h)
75 mph (120.7 km/h)73.35 mph (118.04 km/h)
80 mph (128.75 km/h)78.24 mph (125.91 km/h)
85 mph (136.79 km/h)83.13 mph (133.78 km/h)
90 mph (144.84 km/h)88.02 mph (141.65 km/h)
95 mph (152.89 km/h)92.91 mph (149.52 km/h)
100 mph (160.93 km/h)97.8 mph (157.39 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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