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 235/80r16 Tire Comparison Side By Side
  185/85-14 235/80-16 Difference
Diameter inches (mm) 26.38 (670.1) 30.8 (782.4) 4.42 (112.3) 16.8%
Width inches (mm) 7.28 (185) 9.25 (235) 1.97 (50) 27%
Circum. inches (mm) 82.88 (2105.18) 96.77 (2457.98) 13.89 (352.8) 16.8%
Sidewall Height inches (mm) 6.19 (157.25) 7.4 (188) 1.21 (30.75) 19.6%
Revolutions per mile (km) 764.47 (475.02) 654.74 (406.84) -109.73 (-68.18) -14.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.35 mph (37.58 km/h)
25 mph (40.23 km/h)29.19 mph (46.98 km/h)
30 mph (48.28 km/h)35.03 mph (56.37 km/h)
35 mph (56.33 km/h)40.87 mph (65.77 km/h)
40 mph (64.37 km/h)46.7 mph (75.16 km/h)
45 mph (72.42 km/h)52.54 mph (84.56 km/h)
50 mph (80.47 km/h)58.38 mph (93.95 km/h)
55 mph (88.51 km/h)64.22 mph (103.35 km/h)
60 mph (96.56 km/h)70.06 mph (112.74 km/h)
65 mph (104.61 km/h)75.89 mph (122.14 km/h)
70 mph (112.65 km/h)81.73 mph (131.53 km/h)
75 mph (120.7 km/h)87.57 mph (140.93 km/h)
80 mph (128.75 km/h)93.41 mph (150.32 km/h)
85 mph (136.79 km/h)99.24 mph (159.72 km/h)
90 mph (144.84 km/h)105.08 mph (169.11 km/h)
95 mph (152.89 km/h)110.92 mph (178.51 km/h)
100 mph (160.93 km/h)116.76 mph (187.91 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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