Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/55r16 vs 215/70r16 Tire Comparison Side By Side
  215/55-16 215/70-16 Difference
Diameter inches (mm) 25.31 (642.9) 27.85 (707.4) 2.54 (64.5) 10%
Width inches (mm) 8.46 (215) 8.46 (215) 0 (0) 0%
Circum. inches (mm) 79.52 (2019.73) 87.49 (2222.36) 7.98 (202.63) 10%
Sidewall Height inches (mm) 4.66 (118.25) 5.93 (150.5) 1.27 (32.25) 27.3%
Revolutions per mile (km) 796.81 (495.11) 724.16 (449.97) -72.65 (-45.14) -9.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.01 mph (35.42 km/h)
25 mph (40.23 km/h)27.51 mph (44.27 km/h)
30 mph (48.28 km/h)33.01 mph (53.12 km/h)
35 mph (56.33 km/h)38.51 mph (61.98 km/h)
40 mph (64.37 km/h)44.01 mph (70.83 km/h)
45 mph (72.42 km/h)49.51 mph (79.69 km/h)
50 mph (80.47 km/h)55.02 mph (88.54 km/h)
55 mph (88.51 km/h)60.52 mph (97.39 km/h)
60 mph (96.56 km/h)66.02 mph (106.25 km/h)
65 mph (104.61 km/h)71.52 mph (115.1 km/h)
70 mph (112.65 km/h)77.02 mph (123.96 km/h)
75 mph (120.7 km/h)82.52 mph (132.81 km/h)
80 mph (128.75 km/h)88.03 mph (141.66 km/h)
85 mph (136.79 km/h)93.53 mph (150.52 km/h)
90 mph (144.84 km/h)99.03 mph (159.37 km/h)
95 mph (152.89 km/h)104.53 mph (168.23 km/h)
100 mph (160.93 km/h)110.03 mph (177.08 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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