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 185/55r16 Tire Comparison Side By Side
  185/50-16 185/55-16 Difference
Diameter inches (mm) 23.28 (591.4) 24.01 (609.9) 0.73 (18.5) 3.1%
Width inches (mm) 7.28 (185) 7.28 (185) 0 (0) 0%
Circum. inches (mm) 73.15 (1857.94) 75.44 (1916.06) 2.29 (58.12) 3.1%
Sidewall Height inches (mm) 3.64 (92.5) 4.01 (101.75) 0.36 (9.25) 10%
Revolutions per mile (km) 866.2 (538.23) 839.92 (521.9) -26.27 (-16.33) -3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.63 mph (33.19 km/h)
25 mph (40.23 km/h)25.78 mph (41.49 km/h)
30 mph (48.28 km/h)30.94 mph (49.79 km/h)
35 mph (56.33 km/h)36.09 mph (58.09 km/h)
40 mph (64.37 km/h)41.25 mph (66.39 km/h)
45 mph (72.42 km/h)46.41 mph (74.69 km/h)
50 mph (80.47 km/h)51.56 mph (82.98 km/h)
55 mph (88.51 km/h)56.72 mph (91.28 km/h)
60 mph (96.56 km/h)61.88 mph (99.58 km/h)
65 mph (104.61 km/h)67.03 mph (107.88 km/h)
70 mph (112.65 km/h)72.19 mph (116.18 km/h)
75 mph (120.7 km/h)77.35 mph (124.48 km/h)
80 mph (128.75 km/h)82.5 mph (132.78 km/h)
85 mph (136.79 km/h)87.66 mph (141.07 km/h)
90 mph (144.84 km/h)92.82 mph (149.37 km/h)
95 mph (152.89 km/h)97.97 mph (157.67 km/h)
100 mph (160.93 km/h)103.13 mph (165.97 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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