Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
220/70r14 vs 225/60r15 Tire Comparison Side By Side
  220/70-14 225/60-15 Difference
Diameter inches (mm) 26.13 (663.6) 25.63 (651) -0.5 (-12.6) -1.9%
Width inches (mm) 8.66 (220) 8.86 (225) 0.2 (5) 2.3%
Circum. inches (mm) 82.08 (2084.76) 80.52 (2045.18) -1.56 (-39.58) -1.9%
Sidewall Height inches (mm) 6.06 (154) 5.31 (135) -0.75 (-19) -12.3%
Revolutions per mile (km) 771.96 (479.67) 786.9 (488.95) 14.94 (9.28) 1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.62 mph (31.58 km/h)
25 mph (40.23 km/h)24.53 mph (39.47 km/h)
30 mph (48.28 km/h)29.43 mph (47.36 km/h)
35 mph (56.33 km/h)34.34 mph (55.26 km/h)
40 mph (64.37 km/h)39.24 mph (63.15 km/h)
45 mph (72.42 km/h)44.15 mph (71.05 km/h)
50 mph (80.47 km/h)49.05 mph (78.94 km/h)
55 mph (88.51 km/h)53.96 mph (86.83 km/h)
60 mph (96.56 km/h)58.86 mph (94.73 km/h)
65 mph (104.61 km/h)63.77 mph (102.62 km/h)
70 mph (112.65 km/h)68.67 mph (110.52 km/h)
75 mph (120.7 km/h)73.58 mph (118.41 km/h)
80 mph (128.75 km/h)78.48 mph (126.3 km/h)
85 mph (136.79 km/h)83.39 mph (134.2 km/h)
90 mph (144.84 km/h)88.29 mph (142.09 km/h)
95 mph (152.89 km/h)93.2 mph (149.99 km/h)
100 mph (160.93 km/h)98.1 mph (157.88 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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