Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/60r15 vs 175/65r15 Tire Comparison Side By Side
  165/60-15 175/65-15 Difference
Diameter inches (mm) 22.8 (579) 23.96 (608.5) 1.16 (29.5) 5.1%
Width inches (mm) 6.5 (165) 6.89 (175) 0.39 (10) 6.1%
Circum. inches (mm) 71.61 (1818.98) 75.26 (1911.66) 3.65 (92.68) 5.1%
Sidewall Height inches (mm) 3.9 (99) 4.48 (113.75) 0.58 (14.75) 14.9%
Revolutions per mile (km) 884.75 (549.76) 841.86 (523.1) -42.89 (-26.65) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.02 mph (33.83 km/h)
25 mph (40.23 km/h)26.27 mph (42.28 km/h)
30 mph (48.28 km/h)31.53 mph (50.74 km/h)
35 mph (56.33 km/h)36.78 mph (59.2 km/h)
40 mph (64.37 km/h)42.04 mph (67.65 km/h)
45 mph (72.42 km/h)47.29 mph (76.11 km/h)
50 mph (80.47 km/h)52.55 mph (84.57 km/h)
55 mph (88.51 km/h)57.8 mph (93.02 km/h)
60 mph (96.56 km/h)63.06 mph (101.48 km/h)
65 mph (104.61 km/h)68.31 mph (109.94 km/h)
70 mph (112.65 km/h)73.57 mph (118.39 km/h)
75 mph (120.7 km/h)78.82 mph (126.85 km/h)
80 mph (128.75 km/h)84.08 mph (135.31 km/h)
85 mph (136.79 km/h)89.33 mph (143.76 km/h)
90 mph (144.84 km/h)94.59 mph (152.22 km/h)
95 mph (152.89 km/h)99.84 mph (160.68 km/h)
100 mph (160.93 km/h)105.09 mph (169.13 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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