Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/50r20 vs 255/55r20 Tire Comparison Side By Side
  265/50-20 255/55-20 Difference
Diameter inches (mm) 30.43 (773) 31.04 (788.5) 0.61 (15.5) 2%
Width inches (mm) 10.43 (265) 10.04 (255) -0.39 (-10) -3.8%
Circum. inches (mm) 95.61 (2428.45) 97.53 (2477.15) 1.92 (48.69) 2%
Sidewall Height inches (mm) 5.22 (132.5) 5.52 (140.25) 0.31 (7.75) 5.8%
Revolutions per mile (km) 662.7 (411.78) 649.68 (403.69) -13.03 (-8.09) -2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.4 mph (32.83 km/h)
25 mph (40.23 km/h)25.5 mph (41.04 km/h)
30 mph (48.28 km/h)30.6 mph (49.25 km/h)
35 mph (56.33 km/h)35.7 mph (57.46 km/h)
40 mph (64.37 km/h)40.8 mph (65.66 km/h)
45 mph (72.42 km/h)45.9 mph (73.87 km/h)
50 mph (80.47 km/h)51 mph (82.08 km/h)
55 mph (88.51 km/h)56.1 mph (90.29 km/h)
60 mph (96.56 km/h)61.2 mph (98.5 km/h)
65 mph (104.61 km/h)66.3 mph (106.71 km/h)
70 mph (112.65 km/h)71.4 mph (114.91 km/h)
75 mph (120.7 km/h)76.5 mph (123.12 km/h)
80 mph (128.75 km/h)81.6 mph (131.33 km/h)
85 mph (136.79 km/h)86.7 mph (139.54 km/h)
90 mph (144.84 km/h)91.8 mph (147.75 km/h)
95 mph (152.89 km/h)96.9 mph (155.95 km/h)
100 mph (160.93 km/h)102.01 mph (164.16 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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