Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/75r15 vs 215/75r15 Tire Comparison Side By Side
  225/75-15 215/75-15 Difference
Diameter inches (mm) 28.29 (718.5) 27.7 (703.5) -0.59 (-15) -2.1%
Width inches (mm) 8.86 (225) 8.46 (215) -0.39 (-10) -4.4%
Circum. inches (mm) 88.87 (2257.23) 87.01 (2210.11) -1.86 (-47.12) -2.1%
Sidewall Height inches (mm) 6.64 (168.75) 6.35 (161.25) -0.3 (-7.5) -4.4%
Revolutions per mile (km) 712.97 (443.02) 728.17 (452.47) 15.2 (9.45) 2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.58 mph (31.51 km/h)
25 mph (40.23 km/h)24.48 mph (39.39 km/h)
30 mph (48.28 km/h)29.37 mph (47.27 km/h)
35 mph (56.33 km/h)34.27 mph (55.15 km/h)
40 mph (64.37 km/h)39.16 mph (63.03 km/h)
45 mph (72.42 km/h)44.06 mph (70.91 km/h)
50 mph (80.47 km/h)48.96 mph (78.79 km/h)
55 mph (88.51 km/h)53.85 mph (86.67 km/h)
60 mph (96.56 km/h)58.75 mph (94.54 km/h)
65 mph (104.61 km/h)63.64 mph (102.42 km/h)
70 mph (112.65 km/h)68.54 mph (110.3 km/h)
75 mph (120.7 km/h)73.43 mph (118.18 km/h)
80 mph (128.75 km/h)78.33 mph (126.06 km/h)
85 mph (136.79 km/h)83.23 mph (133.94 km/h)
90 mph (144.84 km/h)88.12 mph (141.82 km/h)
95 mph (152.89 km/h)93.02 mph (149.7 km/h)
100 mph (160.93 km/h)97.91 mph (157.57 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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