Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/55r20 vs 265/60r20 Tire Comparison Side By Side
  275/55-20 265/60-20 Difference
Diameter inches (mm) 31.91 (810.5) 32.52 (826) 0.61 (15.5) 1.9%
Width inches (mm) 10.83 (275) 10.43 (265) -0.39 (-10) -3.6%
Circum. inches (mm) 100.25 (2546.26) 102.16 (2594.96) 1.92 (48.69) 1.9%
Sidewall Height inches (mm) 5.95 (151.25) 6.26 (159) 0.31 (7.75) 5.1%
Revolutions per mile (km) 632.04 (392.73) 620.18 (385.36) -11.86 (-7.37) -1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.38 mph (32.8 km/h)
25 mph (40.23 km/h)25.48 mph (41 km/h)
30 mph (48.28 km/h)30.57 mph (49.2 km/h)
35 mph (56.33 km/h)35.67 mph (57.4 km/h)
40 mph (64.37 km/h)40.76 mph (65.6 km/h)
45 mph (72.42 km/h)45.86 mph (73.81 km/h)
50 mph (80.47 km/h)50.96 mph (82.01 km/h)
55 mph (88.51 km/h)56.05 mph (90.21 km/h)
60 mph (96.56 km/h)61.15 mph (98.41 km/h)
65 mph (104.61 km/h)66.24 mph (106.61 km/h)
70 mph (112.65 km/h)71.34 mph (114.81 km/h)
75 mph (120.7 km/h)76.43 mph (123.01 km/h)
80 mph (128.75 km/h)81.53 mph (131.21 km/h)
85 mph (136.79 km/h)86.63 mph (139.41 km/h)
90 mph (144.84 km/h)91.72 mph (147.61 km/h)
95 mph (152.89 km/h)96.82 mph (155.81 km/h)
100 mph (160.93 km/h)101.91 mph (164.01 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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