Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/75r15 vs 235/75r15 Tire Comparison Side By Side
  255/75-15 235/75-15 Difference
Diameter inches (mm) 30.06 (763.5) 28.88 (733.5) -1.18 (-30) -3.9%
Width inches (mm) 10.04 (255) 9.25 (235) -0.79 (-20) -7.8%
Circum. inches (mm) 94.43 (2398.61) 90.72 (2304.36) -3.71 (-94.25) -3.9%
Sidewall Height inches (mm) 7.53 (191.25) 6.94 (176.25) -0.59 (-15) -7.8%
Revolutions per mile (km) 670.95 (416.91) 698.39 (433.96) 27.44 (17.05) 4.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.21 mph (30.92 km/h)
25 mph (40.23 km/h)24.02 mph (38.65 km/h)
30 mph (48.28 km/h)28.82 mph (46.38 km/h)
35 mph (56.33 km/h)33.62 mph (54.11 km/h)
40 mph (64.37 km/h)38.43 mph (61.84 km/h)
45 mph (72.42 km/h)43.23 mph (69.58 km/h)
50 mph (80.47 km/h)48.04 mph (77.31 km/h)
55 mph (88.51 km/h)52.84 mph (85.04 km/h)
60 mph (96.56 km/h)57.64 mph (92.77 km/h)
65 mph (104.61 km/h)62.45 mph (100.5 km/h)
70 mph (112.65 km/h)67.25 mph (108.23 km/h)
75 mph (120.7 km/h)72.05 mph (115.96 km/h)
80 mph (128.75 km/h)76.86 mph (123.69 km/h)
85 mph (136.79 km/h)81.66 mph (131.42 km/h)
90 mph (144.84 km/h)86.46 mph (139.15 km/h)
95 mph (152.89 km/h)91.27 mph (146.88 km/h)
100 mph (160.93 km/h)96.07 mph (154.61 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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