Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/75r15 vs 33/10.5r15 Tire Comparison Side By Side
  235/75-15 33/10.5-15 Difference
Diameter inches (mm) 28.88 (733.5) 33.08 (840.24) 4.2 (106.74) 14.6%
Width inches (mm) 9.25 (235) 10.51 (267) 1.26 (32) 13.6%
Circum. inches (mm) 90.72 (2304.36) 103.92 (2639.69) 13.2 (335.33) 14.6%
Sidewall Height inches (mm) 6.94 (176.25) 9.04 (229.62) 2.1 (53.37) 30.3%
Revolutions per mile (km) 698.39 (433.96) 609.67 (378.83) -88.72 (-55.13) -12.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.91 mph (36.87 km/h)
25 mph (40.23 km/h)28.64 mph (46.09 km/h)
30 mph (48.28 km/h)34.37 mph (55.31 km/h)
35 mph (56.33 km/h)40.09 mph (64.52 km/h)
40 mph (64.37 km/h)45.82 mph (73.74 km/h)
45 mph (72.42 km/h)51.55 mph (82.96 km/h)
50 mph (80.47 km/h)57.28 mph (92.18 km/h)
55 mph (88.51 km/h)63 mph (101.39 km/h)
60 mph (96.56 km/h)68.73 mph (110.61 km/h)
65 mph (104.61 km/h)74.46 mph (119.83 km/h)
70 mph (112.65 km/h)80.19 mph (129.05 km/h)
75 mph (120.7 km/h)85.91 mph (138.27 km/h)
80 mph (128.75 km/h)91.64 mph (147.48 km/h)
85 mph (136.79 km/h)97.37 mph (156.7 km/h)
90 mph (144.84 km/h)103.1 mph (165.92 km/h)
95 mph (152.89 km/h)108.82 mph (175.14 km/h)
100 mph (160.93 km/h)114.55 mph (184.35 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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