Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
180/60r16 vs 205/60r16 Tire Comparison Side By Side
  180/60-16 205/60-16 Difference
Diameter inches (mm) 24.5 (622.4) 25.69 (652.4) 1.18 (30) 4.8%
Width inches (mm) 7.09 (180) 8.07 (205) 0.98 (25) 13.9%
Circum. inches (mm) 76.98 (1955.33) 80.69 (2049.58) 3.71 (94.25) 4.8%
Sidewall Height inches (mm) 4.25 (108) 4.84 (123) 0.59 (15) 13.9%
Revolutions per mile (km) 823.06 (511.42) 785.21 (487.91) -37.85 (-23.52) -4.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.96 mph (33.74 km/h)
25 mph (40.23 km/h)26.21 mph (42.17 km/h)
30 mph (48.28 km/h)31.45 mph (50.61 km/h)
35 mph (56.33 km/h)36.69 mph (59.04 km/h)
40 mph (64.37 km/h)41.93 mph (67.48 km/h)
45 mph (72.42 km/h)47.17 mph (75.91 km/h)
50 mph (80.47 km/h)52.41 mph (84.35 km/h)
55 mph (88.51 km/h)57.65 mph (92.78 km/h)
60 mph (96.56 km/h)62.89 mph (101.22 km/h)
65 mph (104.61 km/h)68.13 mph (109.65 km/h)
70 mph (112.65 km/h)73.37 mph (118.08 km/h)
75 mph (120.7 km/h)78.62 mph (126.52 km/h)
80 mph (128.75 km/h)83.86 mph (134.95 km/h)
85 mph (136.79 km/h)89.1 mph (143.39 km/h)
90 mph (144.84 km/h)94.34 mph (151.82 km/h)
95 mph (152.89 km/h)99.58 mph (160.26 km/h)
100 mph (160.93 km/h)104.82 mph (168.69 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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