Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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165/65r13 vs 175/70r13 Tire Comparison Side By Side
  165/65-13 175/70-13 Difference
Diameter inches (mm) 21.44 (544.7) 22.65 (575.2) 1.2 (30.5) 5.6%
Width inches (mm) 6.5 (165) 6.89 (175) 0.39 (10) 6.1%
Circum. inches (mm) 67.37 (1711.23) 71.14 (1807.04) 3.77 (95.82) 5.6%
Sidewall Height inches (mm) 4.22 (107.25) 4.82 (122.5) 0.6 (15.25) 14.2%
Revolutions per mile (km) 940.46 (584.38) 890.59 (553.39) -49.87 (-30.99) -5.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.12 mph (33.99 km/h)
25 mph (40.23 km/h)26.4 mph (42.49 km/h)
30 mph (48.28 km/h)31.68 mph (50.98 km/h)
35 mph (56.33 km/h)36.96 mph (59.48 km/h)
40 mph (64.37 km/h)42.24 mph (67.98 km/h)
45 mph (72.42 km/h)47.52 mph (76.48 km/h)
50 mph (80.47 km/h)52.8 mph (84.97 km/h)
55 mph (88.51 km/h)58.08 mph (93.47 km/h)
60 mph (96.56 km/h)63.36 mph (101.97 km/h)
65 mph (104.61 km/h)68.64 mph (110.46 km/h)
70 mph (112.65 km/h)73.92 mph (118.96 km/h)
75 mph (120.7 km/h)79.2 mph (127.46 km/h)
80 mph (128.75 km/h)84.48 mph (135.96 km/h)
85 mph (136.79 km/h)89.76 mph (144.45 km/h)
90 mph (144.84 km/h)95.04 mph (152.95 km/h)
95 mph (152.89 km/h)100.32 mph (161.45 km/h)
100 mph (160.93 km/h)105.6 mph (169.95 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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