Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/50r16 vs 185/40r16 Tire Comparison Side By Side
  185/50-16 185/40-16 Difference
Diameter inches (mm) 23.28 (591.4) 21.83 (554.4) -1.46 (-37) -6.3%
Width inches (mm) 7.28 (185) 7.28 (185) 0 (0) 0%
Circum. inches (mm) 73.15 (1857.94) 68.57 (1741.7) -4.58 (-116.24) -6.3%
Sidewall Height inches (mm) 3.64 (92.5) 2.91 (74) -0.73 (-18.5) -20%
Revolutions per mile (km) 866.2 (538.23) 924.01 (574.15) 57.81 (35.92) 6.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.75 mph (30.17 km/h)
25 mph (40.23 km/h)23.44 mph (37.72 km/h)
30 mph (48.28 km/h)28.12 mph (45.26 km/h)
35 mph (56.33 km/h)32.81 mph (52.8 km/h)
40 mph (64.37 km/h)37.5 mph (60.35 km/h)
45 mph (72.42 km/h)42.18 mph (67.89 km/h)
50 mph (80.47 km/h)46.87 mph (75.43 km/h)
55 mph (88.51 km/h)51.56 mph (82.98 km/h)
60 mph (96.56 km/h)56.25 mph (90.52 km/h)
65 mph (104.61 km/h)60.93 mph (98.06 km/h)
70 mph (112.65 km/h)65.62 mph (105.61 km/h)
75 mph (120.7 km/h)70.31 mph (113.15 km/h)
80 mph (128.75 km/h)74.99 mph (120.69 km/h)
85 mph (136.79 km/h)79.68 mph (128.24 km/h)
90 mph (144.84 km/h)84.37 mph (135.78 km/h)
95 mph (152.89 km/h)89.06 mph (143.32 km/h)
100 mph (160.93 km/h)93.74 mph (150.87 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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