Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/45r15 vs 205/55r16 Tire Comparison Side By Side
  215/45-15 205/55-16 Difference
Diameter inches (mm) 22.62 (574.5) 24.88 (631.9) 2.26 (57.4) 10%
Width inches (mm) 8.46 (215) 8.07 (205) -0.39 (-10) -4.7%
Circum. inches (mm) 71.06 (1804.84) 78.16 (1985.17) 7.1 (180.33) 10%
Sidewall Height inches (mm) 3.81 (96.75) 4.44 (112.75) 0.63 (16) 16.5%
Revolutions per mile (km) 891.68 (554.06) 810.68 (503.73) -81 (-50.33) -9.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22 mph (35.4 km/h)
25 mph (40.23 km/h)27.5 mph (44.25 km/h)
30 mph (48.28 km/h)33 mph (53.1 km/h)
35 mph (56.33 km/h)38.5 mph (61.95 km/h)
40 mph (64.37 km/h)44 mph (70.81 km/h)
45 mph (72.42 km/h)49.5 mph (79.66 km/h)
50 mph (80.47 km/h)55 mph (88.51 km/h)
55 mph (88.51 km/h)60.5 mph (97.36 km/h)
60 mph (96.56 km/h)65.99 mph (106.21 km/h)
65 mph (104.61 km/h)71.49 mph (115.06 km/h)
70 mph (112.65 km/h)76.99 mph (123.91 km/h)
75 mph (120.7 km/h)82.49 mph (132.76 km/h)
80 mph (128.75 km/h)87.99 mph (141.61 km/h)
85 mph (136.79 km/h)93.49 mph (150.46 km/h)
90 mph (144.84 km/h)98.99 mph (159.31 km/h)
95 mph (152.89 km/h)104.49 mph (168.16 km/h)
100 mph (160.93 km/h)109.99 mph (177.01 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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