Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/70r15 vs 205/70r15 Tire Comparison Side By Side
  215/70-15 205/70-15 Difference
Diameter inches (mm) 26.85 (682) 26.3 (668) -0.55 (-14) -2.1%
Width inches (mm) 8.46 (215) 8.07 (205) -0.39 (-10) -4.7%
Circum. inches (mm) 84.35 (2142.57) 82.62 (2098.58) -1.73 (-43.98) -2.1%
Sidewall Height inches (mm) 5.93 (150.5) 5.65 (143.5) -0.28 (-7) -4.7%
Revolutions per mile (km) 751.13 (466.73) 766.87 (476.51) 15.74 (9.78) 2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.59 mph (31.53 km/h)
25 mph (40.23 km/h)24.49 mph (39.41 km/h)
30 mph (48.28 km/h)29.38 mph (47.29 km/h)
35 mph (56.33 km/h)34.28 mph (55.17 km/h)
40 mph (64.37 km/h)39.18 mph (63.05 km/h)
45 mph (72.42 km/h)44.08 mph (70.93 km/h)
50 mph (80.47 km/h)48.97 mph (78.82 km/h)
55 mph (88.51 km/h)53.87 mph (86.7 km/h)
60 mph (96.56 km/h)58.77 mph (94.58 km/h)
65 mph (104.61 km/h)63.67 mph (102.46 km/h)
70 mph (112.65 km/h)68.56 mph (110.34 km/h)
75 mph (120.7 km/h)73.46 mph (118.22 km/h)
80 mph (128.75 km/h)78.36 mph (126.1 km/h)
85 mph (136.79 km/h)83.26 mph (133.99 km/h)
90 mph (144.84 km/h)88.15 mph (141.87 km/h)
95 mph (152.89 km/h)93.05 mph (149.75 km/h)
100 mph (160.93 km/h)97.95 mph (157.63 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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