Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/45r20 vs 275/45r20 Tire Comparison Side By Side
  255/45-20 275/45-20 Difference
Diameter inches (mm) 29.04 (737.5) 29.74 (755.5) 0.71 (18) 2.4%
Width inches (mm) 10.04 (255) 10.83 (275) 0.79 (20) 7.8%
Circum. inches (mm) 91.22 (2316.92) 93.44 (2373.47) 2.23 (56.55) 2.4%
Sidewall Height inches (mm) 4.52 (114.75) 4.87 (123.75) 0.35 (9) 7.8%
Revolutions per mile (km) 694.6 (431.61) 678.05 (421.32) -16.55 (-10.28) -2.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.49 mph (32.97 km/h)
25 mph (40.23 km/h)25.61 mph (41.22 km/h)
30 mph (48.28 km/h)30.73 mph (49.46 km/h)
35 mph (56.33 km/h)35.85 mph (57.7 km/h)
40 mph (64.37 km/h)40.98 mph (65.95 km/h)
45 mph (72.42 km/h)46.1 mph (74.19 km/h)
50 mph (80.47 km/h)51.22 mph (82.43 km/h)
55 mph (88.51 km/h)56.34 mph (90.67 km/h)
60 mph (96.56 km/h)61.46 mph (98.92 km/h)
65 mph (104.61 km/h)66.59 mph (107.16 km/h)
70 mph (112.65 km/h)71.71 mph (115.4 km/h)
75 mph (120.7 km/h)76.83 mph (123.65 km/h)
80 mph (128.75 km/h)81.95 mph (131.89 km/h)
85 mph (136.79 km/h)87.07 mph (140.13 km/h)
90 mph (144.84 km/h)92.2 mph (148.38 km/h)
95 mph (152.89 km/h)97.32 mph (156.62 km/h)
100 mph (160.93 km/h)102.44 mph (164.86 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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