Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/45r15 vs 195/65r15 Tire Comparison Side By Side
  205/45-15 195/65-15 Difference
Diameter inches (mm) 22.26 (565.5) 24.98 (634.5) 2.72 (69) 12.2%
Width inches (mm) 8.07 (205) 7.68 (195) -0.39 (-10) -4.9%
Circum. inches (mm) 69.94 (1776.57) 78.48 (1993.34) 8.53 (216.77) 12.2%
Sidewall Height inches (mm) 3.63 (92.25) 4.99 (126.75) 1.36 (34.5) 37.4%
Revolutions per mile (km) 905.87 (562.88) 807.36 (501.67) -98.51 (-61.21) -10.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.44 mph (36.11 km/h)
25 mph (40.23 km/h)28.05 mph (45.14 km/h)
30 mph (48.28 km/h)33.66 mph (54.17 km/h)
35 mph (56.33 km/h)39.27 mph (63.2 km/h)
40 mph (64.37 km/h)44.88 mph (72.23 km/h)
45 mph (72.42 km/h)50.49 mph (81.26 km/h)
50 mph (80.47 km/h)56.1 mph (90.29 km/h)
55 mph (88.51 km/h)61.71 mph (99.31 km/h)
60 mph (96.56 km/h)67.32 mph (108.34 km/h)
65 mph (104.61 km/h)72.93 mph (117.37 km/h)
70 mph (112.65 km/h)78.54 mph (126.4 km/h)
75 mph (120.7 km/h)84.15 mph (135.43 km/h)
80 mph (128.75 km/h)89.76 mph (144.46 km/h)
85 mph (136.79 km/h)95.37 mph (153.49 km/h)
90 mph (144.84 km/h)100.98 mph (162.51 km/h)
95 mph (152.89 km/h)106.59 mph (171.54 km/h)
100 mph (160.93 km/h)112.2 mph (180.57 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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