Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/60r15 vs 215/70r15 Tire Comparison Side By Side
  275/60-15 215/70-15 Difference
Diameter inches (mm) 27.99 (711) 26.85 (682) -1.14 (-29) -4.1%
Width inches (mm) 10.83 (275) 8.46 (215) -2.36 (-60) -21.8%
Circum. inches (mm) 87.94 (2233.67) 84.35 (2142.57) -3.59 (-91.11) -4.1%
Sidewall Height inches (mm) 6.5 (165) 5.93 (150.5) -0.57 (-14.5) -8.8%
Revolutions per mile (km) 720.49 (447.69) 751.13 (466.73) 30.64 (19.04) 4.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.18 mph (30.87 km/h)
25 mph (40.23 km/h)23.98 mph (38.59 km/h)
30 mph (48.28 km/h)28.78 mph (46.31 km/h)
35 mph (56.33 km/h)33.57 mph (54.03 km/h)
40 mph (64.37 km/h)38.37 mph (61.75 km/h)
45 mph (72.42 km/h)43.16 mph (69.47 km/h)
50 mph (80.47 km/h)47.96 mph (77.19 km/h)
55 mph (88.51 km/h)52.76 mph (84.9 km/h)
60 mph (96.56 km/h)57.55 mph (92.62 km/h)
65 mph (104.61 km/h)62.35 mph (100.34 km/h)
70 mph (112.65 km/h)67.14 mph (108.06 km/h)
75 mph (120.7 km/h)71.94 mph (115.78 km/h)
80 mph (128.75 km/h)76.74 mph (123.5 km/h)
85 mph (136.79 km/h)81.53 mph (131.21 km/h)
90 mph (144.84 km/h)86.33 mph (138.93 km/h)
95 mph (152.89 km/h)91.13 mph (146.65 km/h)
100 mph (160.93 km/h)95.92 mph (154.37 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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