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 185/65r14 Tire Comparison Side By Side
  185/85-14 185/65-14 Difference
Diameter inches (mm) 26.38 (670.1) 23.47 (596.1) -2.91 (-74) -11%
Width inches (mm) 7.28 (185) 7.28 (185) 0 (0) 0%
Circum. inches (mm) 82.88 (2105.18) 73.73 (1872.7) -9.15 (-232.48) -11%
Sidewall Height inches (mm) 6.19 (157.25) 4.73 (120.25) -1.46 (-37) -23.5%
Revolutions per mile (km) 764.47 (475.02) 859.37 (533.99) 94.9 (58.97) 12.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.79 mph (28.63 km/h)
25 mph (40.23 km/h)22.24 mph (35.79 km/h)
30 mph (48.28 km/h)26.69 mph (42.95 km/h)
35 mph (56.33 km/h)31.13 mph (50.11 km/h)
40 mph (64.37 km/h)35.58 mph (57.26 km/h)
45 mph (72.42 km/h)40.03 mph (64.42 km/h)
50 mph (80.47 km/h)44.48 mph (71.58 km/h)
55 mph (88.51 km/h)48.93 mph (78.74 km/h)
60 mph (96.56 km/h)53.37 mph (85.9 km/h)
65 mph (104.61 km/h)57.82 mph (93.06 km/h)
70 mph (112.65 km/h)62.27 mph (100.21 km/h)
75 mph (120.7 km/h)66.72 mph (107.37 km/h)
80 mph (128.75 km/h)71.17 mph (114.53 km/h)
85 mph (136.79 km/h)75.61 mph (121.69 km/h)
90 mph (144.84 km/h)80.06 mph (128.85 km/h)
95 mph (152.89 km/h)84.51 mph (136 km/h)
100 mph (160.93 km/h)88.96 mph (143.16 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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