Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/45r20 vs 245/45r20 Tire Comparison Side By Side
  265/45-20 245/45-20 Difference
Diameter inches (mm) 29.39 (746.5) 28.68 (728.5) -0.71 (-18) -2.4%
Width inches (mm) 10.43 (265) 9.65 (245) -0.79 (-20) -7.5%
Circum. inches (mm) 92.33 (2345.2) 90.1 (2288.65) -2.23 (-56.55) -2.4%
Sidewall Height inches (mm) 4.69 (119.25) 4.34 (110.25) -0.35 (-9) -7.5%
Revolutions per mile (km) 686.23 (426.4) 703.18 (436.94) 16.96 (10.54) 2.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.52 mph (31.41 km/h)
25 mph (40.23 km/h)24.4 mph (39.26 km/h)
30 mph (48.28 km/h)29.28 mph (47.12 km/h)
35 mph (56.33 km/h)34.16 mph (54.97 km/h)
40 mph (64.37 km/h)39.04 mph (62.82 km/h)
45 mph (72.42 km/h)43.91 mph (70.67 km/h)
50 mph (80.47 km/h)48.79 mph (78.53 km/h)
55 mph (88.51 km/h)53.67 mph (86.38 km/h)
60 mph (96.56 km/h)58.55 mph (94.23 km/h)
65 mph (104.61 km/h)63.43 mph (102.09 km/h)
70 mph (112.65 km/h)68.31 mph (109.94 km/h)
75 mph (120.7 km/h)73.19 mph (117.79 km/h)
80 mph (128.75 km/h)78.07 mph (125.64 km/h)
85 mph (136.79 km/h)82.95 mph (133.5 km/h)
90 mph (144.84 km/h)87.83 mph (141.35 km/h)
95 mph (152.89 km/h)92.71 mph (149.2 km/h)
100 mph (160.93 km/h)97.59 mph (157.05 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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