Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/45r18 vs 265/35r18 Tire Comparison Side By Side
  265/45-18 265/35-18 Difference
Diameter inches (mm) 27.39 (695.7) 25.3 (642.7) -2.09 (-53) -7.6%
Width inches (mm) 10.43 (265) 10.43 (265) 0 (0) 0%
Circum. inches (mm) 86.05 (2185.61) 79.49 (2019.1) -6.56 (-166.5) -7.6%
Sidewall Height inches (mm) 4.69 (119.25) 3.65 (92.75) -1.04 (-26.5) -22.2%
Revolutions per mile (km) 736.34 (457.54) 797.06 (495.27) 60.72 (37.73) 8.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.48 mph (29.73 km/h)
25 mph (40.23 km/h)23.1 mph (37.17 km/h)
30 mph (48.28 km/h)27.71 mph (44.6 km/h)
35 mph (56.33 km/h)32.33 mph (52.04 km/h)
40 mph (64.37 km/h)36.95 mph (59.47 km/h)
45 mph (72.42 km/h)41.57 mph (66.9 km/h)
50 mph (80.47 km/h)46.19 mph (74.34 km/h)
55 mph (88.51 km/h)50.81 mph (81.77 km/h)
60 mph (96.56 km/h)55.43 mph (89.2 km/h)
65 mph (104.61 km/h)60.05 mph (96.64 km/h)
70 mph (112.65 km/h)64.67 mph (104.07 km/h)
75 mph (120.7 km/h)69.29 mph (111.51 km/h)
80 mph (128.75 km/h)73.91 mph (118.94 km/h)
85 mph (136.79 km/h)78.52 mph (126.37 km/h)
90 mph (144.84 km/h)83.14 mph (133.81 km/h)
95 mph (152.89 km/h)87.76 mph (141.24 km/h)
100 mph (160.93 km/h)92.38 mph (148.67 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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