Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/85r14 vs 235/85r16 Tire Comparison Side By Side
  185/85-14 235/85-16 Difference
Diameter inches (mm) 26.38 (670.1) 31.73 (805.9) 5.35 (135.8) 20.3%
Width inches (mm) 7.28 (185) 9.25 (235) 1.97 (50) 27%
Circum. inches (mm) 82.88 (2105.18) 99.68 (2531.81) 16.8 (426.63) 20.3%
Sidewall Height inches (mm) 6.19 (157.25) 7.86 (199.75) 1.67 (42.5) 27%
Revolutions per mile (km) 764.47 (475.02) 635.65 (394.97) -128.82 (-80.04) -16.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)24.05 mph (38.71 km/h)
25 mph (40.23 km/h)30.07 mph (48.39 km/h)
30 mph (48.28 km/h)36.08 mph (58.06 km/h)
35 mph (56.33 km/h)42.09 mph (67.74 km/h)
40 mph (64.37 km/h)48.11 mph (77.42 km/h)
45 mph (72.42 km/h)54.12 mph (87.1 km/h)
50 mph (80.47 km/h)60.13 mph (96.77 km/h)
55 mph (88.51 km/h)66.15 mph (106.45 km/h)
60 mph (96.56 km/h)72.16 mph (116.13 km/h)
65 mph (104.61 km/h)78.17 mph (125.81 km/h)
70 mph (112.65 km/h)84.19 mph (135.48 km/h)
75 mph (120.7 km/h)90.2 mph (145.16 km/h)
80 mph (128.75 km/h)96.21 mph (154.84 km/h)
85 mph (136.79 km/h)102.23 mph (164.52 km/h)
90 mph (144.84 km/h)108.24 mph (174.19 km/h)
95 mph (152.89 km/h)114.25 mph (183.87 km/h)
100 mph (160.93 km/h)120.27 mph (193.55 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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