Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/70r15 vs 275/60r15 Tire Comparison Side By Side
  255/70-15 275/60-15 Difference
Diameter inches (mm) 29.06 (738) 27.99 (711) -1.06 (-27) -3.7%
Width inches (mm) 10.04 (255) 10.83 (275) 0.79 (20) 7.8%
Circum. inches (mm) 91.28 (2318.5) 87.94 (2233.67) -3.34 (-84.82) -3.7%
Sidewall Height inches (mm) 7.03 (178.5) 6.5 (165) -0.53 (-13.5) -7.6%
Revolutions per mile (km) 694.13 (431.31) 720.49 (447.69) 26.36 (16.38) 3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.27 mph (31.01 km/h)
25 mph (40.23 km/h)24.09 mph (38.76 km/h)
30 mph (48.28 km/h)28.9 mph (46.51 km/h)
35 mph (56.33 km/h)33.72 mph (54.27 km/h)
40 mph (64.37 km/h)38.54 mph (62.02 km/h)
45 mph (72.42 km/h)43.35 mph (69.77 km/h)
50 mph (80.47 km/h)48.17 mph (77.52 km/h)
55 mph (88.51 km/h)52.99 mph (85.28 km/h)
60 mph (96.56 km/h)57.8 mph (93.03 km/h)
65 mph (104.61 km/h)62.62 mph (100.78 km/h)
70 mph (112.65 km/h)67.44 mph (108.53 km/h)
75 mph (120.7 km/h)72.26 mph (116.29 km/h)
80 mph (128.75 km/h)77.07 mph (124.04 km/h)
85 mph (136.79 km/h)81.89 mph (131.79 km/h)
90 mph (144.84 km/h)86.71 mph (139.54 km/h)
95 mph (152.89 km/h)91.52 mph (147.29 km/h)
100 mph (160.93 km/h)96.34 mph (155.05 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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