Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/35r18 vs 235/40r18 Tire Comparison Side By Side
  265/35-18 235/40-18 Difference
Diameter inches (mm) 25.3 (642.7) 25.4 (645.2) 0.1 (2.5) 0.4%
Width inches (mm) 10.43 (265) 9.25 (235) -1.18 (-30) -11.3%
Circum. inches (mm) 79.49 (2019.1) 79.8 (2026.96) 0.31 (7.85) 0.4%
Sidewall Height inches (mm) 3.65 (92.75) 3.7 (94) 0.05 (1.25) 1.3%
Revolutions per mile (km) 797.06 (495.27) 793.97 (493.35) -3.09 (-1.92) -0.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.08 mph (32.31 km/h)
25 mph (40.23 km/h)25.1 mph (40.39 km/h)
30 mph (48.28 km/h)30.12 mph (48.47 km/h)
35 mph (56.33 km/h)35.14 mph (56.55 km/h)
40 mph (64.37 km/h)40.16 mph (64.62 km/h)
45 mph (72.42 km/h)45.18 mph (72.7 km/h)
50 mph (80.47 km/h)50.19 mph (80.78 km/h)
55 mph (88.51 km/h)55.21 mph (88.86 km/h)
60 mph (96.56 km/h)60.23 mph (96.94 km/h)
65 mph (104.61 km/h)65.25 mph (105.01 km/h)
70 mph (112.65 km/h)70.27 mph (113.09 km/h)
75 mph (120.7 km/h)75.29 mph (121.17 km/h)
80 mph (128.75 km/h)80.31 mph (129.25 km/h)
85 mph (136.79 km/h)85.33 mph (137.33 km/h)
90 mph (144.84 km/h)90.35 mph (145.4 km/h)
95 mph (152.89 km/h)95.37 mph (153.48 km/h)
100 mph (160.93 km/h)100.39 mph (161.56 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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