Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/55r15 vs 195/50r15 Tire Comparison Side By Side
  165/55-15 195/50-15 Difference
Diameter inches (mm) 22.15 (562.5) 22.68 (576) 0.53 (13.5) 2.4%
Width inches (mm) 6.5 (165) 7.68 (195) 1.18 (30) 18.2%
Circum. inches (mm) 69.57 (1767.15) 71.24 (1809.56) 1.67 (42.41) 2.4%
Sidewall Height inches (mm) 3.57 (90.75) 3.84 (97.5) 0.27 (6.75) 7.4%
Revolutions per mile (km) 910.7 (565.88) 889.36 (552.62) -21.34 (-13.26) -2.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.48 mph (32.96 km/h)
25 mph (40.23 km/h)25.6 mph (41.2 km/h)
30 mph (48.28 km/h)30.72 mph (49.44 km/h)
35 mph (56.33 km/h)35.84 mph (57.68 km/h)
40 mph (64.37 km/h)40.96 mph (65.92 km/h)
45 mph (72.42 km/h)46.08 mph (74.16 km/h)
50 mph (80.47 km/h)51.2 mph (82.4 km/h)
55 mph (88.51 km/h)56.32 mph (90.64 km/h)
60 mph (96.56 km/h)61.44 mph (98.88 km/h)
65 mph (104.61 km/h)66.56 mph (107.12 km/h)
70 mph (112.65 km/h)71.68 mph (115.36 km/h)
75 mph (120.7 km/h)76.8 mph (123.6 km/h)
80 mph (128.75 km/h)81.92 mph (131.84 km/h)
85 mph (136.79 km/h)87.04 mph (140.08 km/h)
90 mph (144.84 km/h)92.16 mph (148.32 km/h)
95 mph (152.89 km/h)97.28 mph (156.56 km/h)
100 mph (160.93 km/h)102.4 mph (164.8 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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