Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/50r16 vs 165/45r16 Tire Comparison Side By Side
  175/50-16 165/45-16 Difference
Diameter inches (mm) 22.89 (581.4) 21.85 (554.9) -1.04 (-26.5) -4.6%
Width inches (mm) 6.89 (175) 6.5 (165) -0.39 (-10) -5.7%
Circum. inches (mm) 71.91 (1826.52) 68.63 (1743.27) -3.28 (-83.25) -4.6%
Sidewall Height inches (mm) 3.44 (87.5) 2.92 (74.25) -0.52 (-13.25) -15.1%
Revolutions per mile (km) 881.1 (547.49) 923.18 (573.63) 42.08 (26.15) 4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.09 mph (30.72 km/h)
25 mph (40.23 km/h)23.86 mph (38.4 km/h)
30 mph (48.28 km/h)28.63 mph (46.08 km/h)
35 mph (56.33 km/h)33.4 mph (53.76 km/h)
40 mph (64.37 km/h)38.18 mph (61.44 km/h)
45 mph (72.42 km/h)42.95 mph (69.12 km/h)
50 mph (80.47 km/h)47.72 mph (76.8 km/h)
55 mph (88.51 km/h)52.49 mph (84.48 km/h)
60 mph (96.56 km/h)57.27 mph (92.16 km/h)
65 mph (104.61 km/h)62.04 mph (99.84 km/h)
70 mph (112.65 km/h)66.81 mph (107.52 km/h)
75 mph (120.7 km/h)71.58 mph (115.2 km/h)
80 mph (128.75 km/h)76.35 mph (122.88 km/h)
85 mph (136.79 km/h)81.13 mph (130.56 km/h)
90 mph (144.84 km/h)85.9 mph (138.24 km/h)
95 mph (152.89 km/h)90.67 mph (145.92 km/h)
100 mph (160.93 km/h)95.44 mph (153.6 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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