Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/65r15 vs 255/55r15 Tire Comparison Side By Side
  255/65-15 255/55-15 Difference
Diameter inches (mm) 28.05 (712.5) 26.04 (661.5) -2.01 (-51) -7.2%
Width inches (mm) 10.04 (255) 10.04 (255) 0 (0) 0%
Circum. inches (mm) 88.13 (2238.38) 81.82 (2078.16) -6.31 (-160.22) -7.2%
Sidewall Height inches (mm) 6.53 (165.75) 5.52 (140.25) -1 (-25.5) -15.4%
Revolutions per mile (km) 718.98 (446.75) 774.41 (481.19) 55.43 (34.44) 7.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.57 mph (29.88 km/h)
25 mph (40.23 km/h)23.21 mph (37.35 km/h)
30 mph (48.28 km/h)27.85 mph (44.82 km/h)
35 mph (56.33 km/h)32.49 mph (52.3 km/h)
40 mph (64.37 km/h)37.14 mph (59.77 km/h)
45 mph (72.42 km/h)41.78 mph (67.24 km/h)
50 mph (80.47 km/h)46.42 mph (74.71 km/h)
55 mph (88.51 km/h)51.06 mph (82.18 km/h)
60 mph (96.56 km/h)55.71 mph (89.65 km/h)
65 mph (104.61 km/h)60.35 mph (97.12 km/h)
70 mph (112.65 km/h)64.99 mph (104.59 km/h)
75 mph (120.7 km/h)69.63 mph (112.06 km/h)
80 mph (128.75 km/h)74.27 mph (119.53 km/h)
85 mph (136.79 km/h)78.92 mph (127 km/h)
90 mph (144.84 km/h)83.56 mph (134.47 km/h)
95 mph (152.89 km/h)88.2 mph (141.94 km/h)
100 mph (160.93 km/h)92.84 mph (149.42 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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