Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/65r15 vs 275/60r15 Tire Comparison Side By Side
  275/65-15 275/60-15 Difference
Diameter inches (mm) 29.07 (738.5) 27.99 (711) -1.08 (-27.5) -3.7%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 91.34 (2320.07) 87.94 (2233.67) -3.4 (-86.39) -3.7%
Sidewall Height inches (mm) 7.04 (178.75) 6.5 (165) -0.54 (-13.75) -7.7%
Revolutions per mile (km) 693.66 (431.02) 720.49 (447.69) 26.83 (16.67) 3.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.26 mph (30.99 km/h)
25 mph (40.23 km/h)24.07 mph (38.74 km/h)
30 mph (48.28 km/h)28.88 mph (46.48 km/h)
35 mph (56.33 km/h)33.7 mph (54.23 km/h)
40 mph (64.37 km/h)38.51 mph (61.98 km/h)
45 mph (72.42 km/h)43.32 mph (69.72 km/h)
50 mph (80.47 km/h)48.14 mph (77.47 km/h)
55 mph (88.51 km/h)52.95 mph (85.22 km/h)
60 mph (96.56 km/h)57.77 mph (92.97 km/h)
65 mph (104.61 km/h)62.58 mph (100.71 km/h)
70 mph (112.65 km/h)67.39 mph (108.46 km/h)
75 mph (120.7 km/h)72.21 mph (116.21 km/h)
80 mph (128.75 km/h)77.02 mph (123.95 km/h)
85 mph (136.79 km/h)81.83 mph (131.7 km/h)
90 mph (144.84 km/h)86.65 mph (139.45 km/h)
95 mph (152.89 km/h)91.46 mph (147.19 km/h)
100 mph (160.93 km/h)96.28 mph (154.94 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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