Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/35r18 vs 265/35r18 Tire Comparison Side By Side
  235/35-18 265/35-18 Difference
Diameter inches (mm) 24.48 (621.7) 25.3 (642.7) 0.83 (21) 3.4%
Width inches (mm) 9.25 (235) 10.43 (265) 1.18 (30) 12.8%
Circum. inches (mm) 76.89 (1953.13) 79.49 (2019.1) 2.6 (65.97) 3.4%
Sidewall Height inches (mm) 3.24 (82.25) 3.65 (92.75) 0.41 (10.5) 12.8%
Revolutions per mile (km) 823.98 (512) 797.06 (495.27) -26.92 (-16.73) -3.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.68 mph (33.27 km/h)
25 mph (40.23 km/h)25.84 mph (41.59 km/h)
30 mph (48.28 km/h)31.01 mph (49.91 km/h)
35 mph (56.33 km/h)36.18 mph (58.23 km/h)
40 mph (64.37 km/h)41.35 mph (66.55 km/h)
45 mph (72.42 km/h)46.52 mph (74.87 km/h)
50 mph (80.47 km/h)51.69 mph (83.19 km/h)
55 mph (88.51 km/h)56.86 mph (91.5 km/h)
60 mph (96.56 km/h)62.03 mph (99.82 km/h)
65 mph (104.61 km/h)67.2 mph (108.14 km/h)
70 mph (112.65 km/h)72.36 mph (116.46 km/h)
75 mph (120.7 km/h)77.53 mph (124.78 km/h)
80 mph (128.75 km/h)82.7 mph (133.1 km/h)
85 mph (136.79 km/h)87.87 mph (141.42 km/h)
90 mph (144.84 km/h)93.04 mph (149.73 km/h)
95 mph (152.89 km/h)98.21 mph (158.05 km/h)
100 mph (160.93 km/h)103.38 mph (166.37 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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