Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/60r17 vs 125/60r18 Tire Comparison Side By Side
  215/60-17 125/60-18 Difference
Diameter inches (mm) 27.16 (689.8) 23.91 (607.2) -3.25 (-82.6) -12%
Width inches (mm) 8.46 (215) 4.92 (125) -3.54 (-90) -41.9%
Circum. inches (mm) 85.32 (2167.07) 75.1 (1907.58) -10.22 (-259.5) -12%
Sidewall Height inches (mm) 5.08 (129) 2.95 (75) -2.13 (-54) -41.9%
Revolutions per mile (km) 742.64 (461.45) 843.66 (524.22) 101.02 (62.77) 13.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.61 mph (28.33 km/h)
25 mph (40.23 km/h)22.01 mph (35.42 km/h)
30 mph (48.28 km/h)26.41 mph (42.5 km/h)
35 mph (56.33 km/h)30.81 mph (49.58 km/h)
40 mph (64.37 km/h)35.21 mph (56.67 km/h)
45 mph (72.42 km/h)39.61 mph (63.75 km/h)
50 mph (80.47 km/h)44.01 mph (70.83 km/h)
55 mph (88.51 km/h)48.41 mph (77.91 km/h)
60 mph (96.56 km/h)52.82 mph (85 km/h)
65 mph (104.61 km/h)57.22 mph (92.08 km/h)
70 mph (112.65 km/h)61.62 mph (99.16 km/h)
75 mph (120.7 km/h)66.02 mph (106.25 km/h)
80 mph (128.75 km/h)70.42 mph (113.33 km/h)
85 mph (136.79 km/h)74.82 mph (120.41 km/h)
90 mph (144.84 km/h)79.22 mph (127.5 km/h)
95 mph (152.89 km/h)83.62 mph (134.58 km/h)
100 mph (160.93 km/h)88.03 mph (141.66 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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