Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/85r16 vs 235/75r16 Tire Comparison Side By Side
  185/85-16 235/75-16 Difference
Diameter inches (mm) 28.38 (720.9) 29.88 (758.9) 1.5 (38) 5.3%
Width inches (mm) 7.28 (185) 9.25 (235) 1.97 (50) 27%
Circum. inches (mm) 89.16 (2264.77) 93.86 (2384.15) 4.7 (119.38) 5.3%
Sidewall Height inches (mm) 6.19 (157.25) 6.94 (176.25) 0.75 (19) 12.1%
Revolutions per mile (km) 710.6 (441.54) 675.02 (419.44) -35.58 (-22.11) -5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.05 mph (33.88 km/h)
25 mph (40.23 km/h)26.32 mph (42.35 km/h)
30 mph (48.28 km/h)31.58 mph (50.83 km/h)
35 mph (56.33 km/h)36.84 mph (59.3 km/h)
40 mph (64.37 km/h)42.11 mph (67.77 km/h)
45 mph (72.42 km/h)47.37 mph (76.24 km/h)
50 mph (80.47 km/h)52.64 mph (84.71 km/h)
55 mph (88.51 km/h)57.9 mph (93.18 km/h)
60 mph (96.56 km/h)63.16 mph (101.65 km/h)
65 mph (104.61 km/h)68.43 mph (110.12 km/h)
70 mph (112.65 km/h)73.69 mph (118.59 km/h)
75 mph (120.7 km/h)78.95 mph (127.06 km/h)
80 mph (128.75 km/h)84.22 mph (135.53 km/h)
85 mph (136.79 km/h)89.48 mph (144.01 km/h)
90 mph (144.84 km/h)94.74 mph (152.48 km/h)
95 mph (152.89 km/h)100.01 mph (160.95 km/h)
100 mph (160.93 km/h)105.27 mph (169.42 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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