Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/40r20 vs 245/45r20 Tire Comparison Side By Side
  265/40-20 245/45-20 Difference
Diameter inches (mm) 28.35 (720) 28.68 (728.5) 0.33 (8.5) 1.2%
Width inches (mm) 10.43 (265) 9.65 (245) -0.79 (-20) -7.5%
Circum. inches (mm) 89.05 (2261.95) 90.1 (2288.65) 1.05 (26.7) 1.2%
Sidewall Height inches (mm) 4.17 (106) 4.34 (110.25) 0.17 (4.25) 4%
Revolutions per mile (km) 711.49 (442.1) 703.18 (436.94) -8.3 (-5.16) -1.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.24 mph (32.57 km/h)
25 mph (40.23 km/h)25.3 mph (40.71 km/h)
30 mph (48.28 km/h)30.35 mph (48.85 km/h)
35 mph (56.33 km/h)35.41 mph (56.99 km/h)
40 mph (64.37 km/h)40.47 mph (65.13 km/h)
45 mph (72.42 km/h)45.53 mph (73.28 km/h)
50 mph (80.47 km/h)50.59 mph (81.42 km/h)
55 mph (88.51 km/h)55.65 mph (89.56 km/h)
60 mph (96.56 km/h)60.71 mph (97.7 km/h)
65 mph (104.61 km/h)65.77 mph (105.84 km/h)
70 mph (112.65 km/h)70.83 mph (113.98 km/h)
75 mph (120.7 km/h)75.89 mph (122.13 km/h)
80 mph (128.75 km/h)80.94 mph (130.27 km/h)
85 mph (136.79 km/h)86 mph (138.41 km/h)
90 mph (144.84 km/h)91.06 mph (146.55 km/h)
95 mph (152.89 km/h)96.12 mph (154.69 km/h)
100 mph (160.93 km/h)101.18 mph (162.83 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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