Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/45r20 vs 255/50r20 Tire Comparison Side By Side
  265/45-20 255/50-20 Difference
Diameter inches (mm) 29.39 (746.5) 30.04 (763) 0.65 (16.5) 2.2%
Width inches (mm) 10.43 (265) 10.04 (255) -0.39 (-10) -3.8%
Circum. inches (mm) 92.33 (2345.2) 94.37 (2397.04) 2.04 (51.84) 2.2%
Sidewall Height inches (mm) 4.69 (119.25) 5.02 (127.5) 0.32 (8.25) 6.9%
Revolutions per mile (km) 686.23 (426.4) 671.39 (417.18) -14.84 (-9.22) -2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.44 mph (32.9 km/h)
25 mph (40.23 km/h)25.55 mph (41.12 km/h)
30 mph (48.28 km/h)30.66 mph (49.35 km/h)
35 mph (56.33 km/h)35.77 mph (57.57 km/h)
40 mph (64.37 km/h)40.88 mph (65.8 km/h)
45 mph (72.42 km/h)45.99 mph (74.02 km/h)
50 mph (80.47 km/h)51.11 mph (82.25 km/h)
55 mph (88.51 km/h)56.22 mph (90.47 km/h)
60 mph (96.56 km/h)61.33 mph (98.7 km/h)
65 mph (104.61 km/h)66.44 mph (106.92 km/h)
70 mph (112.65 km/h)71.55 mph (115.14 km/h)
75 mph (120.7 km/h)76.66 mph (123.37 km/h)
80 mph (128.75 km/h)81.77 mph (131.59 km/h)
85 mph (136.79 km/h)86.88 mph (139.82 km/h)
90 mph (144.84 km/h)91.99 mph (148.04 km/h)
95 mph (152.89 km/h)97.1 mph (156.27 km/h)
100 mph (160.93 km/h)102.21 mph (164.49 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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