Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/40r17 vs 225/45r17 Tire Comparison Side By Side
  265/40-17 225/45-17 Difference
Diameter inches (mm) 25.35 (643.8) 24.97 (634.3) -0.37 (-9.5) -1.5%
Width inches (mm) 10.43 (265) 8.86 (225) -1.57 (-40) -15.1%
Circum. inches (mm) 79.63 (2022.56) 78.45 (1992.71) -1.18 (-29.85) -1.5%
Sidewall Height inches (mm) 4.17 (106) 3.99 (101.25) -0.19 (-4.75) -4.5%
Revolutions per mile (km) 795.7 (494.42) 807.61 (501.83) 11.92 (7.41) 1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.7 mph (31.71 km/h)
25 mph (40.23 km/h)24.63 mph (39.64 km/h)
30 mph (48.28 km/h)29.56 mph (47.57 km/h)
35 mph (56.33 km/h)34.48 mph (55.5 km/h)
40 mph (64.37 km/h)39.41 mph (63.42 km/h)
45 mph (72.42 km/h)44.34 mph (71.35 km/h)
50 mph (80.47 km/h)49.26 mph (79.28 km/h)
55 mph (88.51 km/h)54.19 mph (87.21 km/h)
60 mph (96.56 km/h)59.11 mph (95.14 km/h)
65 mph (104.61 km/h)64.04 mph (103.06 km/h)
70 mph (112.65 km/h)68.97 mph (110.99 km/h)
75 mph (120.7 km/h)73.89 mph (118.92 km/h)
80 mph (128.75 km/h)78.82 mph (126.85 km/h)
85 mph (136.79 km/h)83.75 mph (134.78 km/h)
90 mph (144.84 km/h)88.67 mph (142.7 km/h)
95 mph (152.89 km/h)93.6 mph (150.63 km/h)
100 mph (160.93 km/h)98.52 mph (158.56 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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