Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/65r15 vs 195/65r15 Tire Comparison Side By Side
  155/65-15 195/65-15 Difference
Diameter inches (mm) 22.93 (582.5) 24.98 (634.5) 2.05 (52) 8.9%
Width inches (mm) 6.1 (155) 7.68 (195) 1.57 (40) 25.8%
Circum. inches (mm) 72.05 (1829.98) 78.48 (1993.34) 6.43 (163.36) 8.9%
Sidewall Height inches (mm) 3.97 (100.75) 4.99 (126.75) 1.02 (26) 25.8%
Revolutions per mile (km) 879.43 (546.45) 807.36 (501.67) -72.07 (-44.78) -8.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.79 mph (35.06 km/h)
25 mph (40.23 km/h)27.23 mph (43.83 km/h)
30 mph (48.28 km/h)32.68 mph (52.59 km/h)
35 mph (56.33 km/h)38.12 mph (61.36 km/h)
40 mph (64.37 km/h)43.57 mph (70.12 km/h)
45 mph (72.42 km/h)49.02 mph (78.89 km/h)
50 mph (80.47 km/h)54.46 mph (87.65 km/h)
55 mph (88.51 km/h)59.91 mph (96.42 km/h)
60 mph (96.56 km/h)65.36 mph (105.18 km/h)
65 mph (104.61 km/h)70.8 mph (113.95 km/h)
70 mph (112.65 km/h)76.25 mph (122.71 km/h)
75 mph (120.7 km/h)81.7 mph (131.48 km/h)
80 mph (128.75 km/h)87.14 mph (140.24 km/h)
85 mph (136.79 km/h)92.59 mph (149.01 km/h)
90 mph (144.84 km/h)98.03 mph (157.77 km/h)
95 mph (152.89 km/h)103.48 mph (166.54 km/h)
100 mph (160.93 km/h)108.93 mph (175.3 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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