Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/75r14 vs 215/70r14 Tire Comparison Side By Side
  165/75-14 215/70-14 Difference
Diameter inches (mm) 23.74 (603.1) 25.85 (656.6) 2.11 (53.5) 8.9%
Width inches (mm) 6.5 (165) 8.46 (215) 1.97 (50) 30.3%
Circum. inches (mm) 74.59 (1894.69) 81.21 (2062.77) 6.62 (168.08) 8.9%
Sidewall Height inches (mm) 4.87 (123.75) 5.93 (150.5) 1.05 (26.75) 21.6%
Revolutions per mile (km) 849.39 (527.79) 780.19 (484.78) -69.21 (-43) -8.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.77 mph (35.04 km/h)
25 mph (40.23 km/h)27.22 mph (43.8 km/h)
30 mph (48.28 km/h)32.66 mph (52.56 km/h)
35 mph (56.33 km/h)38.1 mph (61.32 km/h)
40 mph (64.37 km/h)43.55 mph (70.08 km/h)
45 mph (72.42 km/h)48.99 mph (78.84 km/h)
50 mph (80.47 km/h)54.44 mph (87.61 km/h)
55 mph (88.51 km/h)59.88 mph (96.37 km/h)
60 mph (96.56 km/h)65.32 mph (105.13 km/h)
65 mph (104.61 km/h)70.77 mph (113.89 km/h)
70 mph (112.65 km/h)76.21 mph (122.65 km/h)
75 mph (120.7 km/h)81.65 mph (131.41 km/h)
80 mph (128.75 km/h)87.1 mph (140.17 km/h)
85 mph (136.79 km/h)92.54 mph (148.93 km/h)
90 mph (144.84 km/h)97.98 mph (157.69 km/h)
95 mph (152.89 km/h)103.43 mph (166.45 km/h)
100 mph (160.93 km/h)108.87 mph (175.21 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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