Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/60r16 vs 185/60r15 Tire Comparison Side By Side
  185/60-16 185/60-15 Difference
Diameter inches (mm) 24.74 (628.4) 23.74 (603) -1 (-25.4) -4%
Width inches (mm) 7.28 (185) 7.28 (185) 0 (0) 0%
Circum. inches (mm) 77.72 (1974.18) 74.58 (1894.38) -3.14 (-79.8) -4%
Sidewall Height inches (mm) 4.37 (111) 4.37 (111) 0 (0) 0%
Revolutions per mile (km) 815.2 (506.54) 849.54 (527.88) 34.34 (21.34) 4.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.19 mph (30.89 km/h)
25 mph (40.23 km/h)23.99 mph (38.61 km/h)
30 mph (48.28 km/h)28.79 mph (46.33 km/h)
35 mph (56.33 km/h)33.59 mph (54.05 km/h)
40 mph (64.37 km/h)38.38 mph (61.77 km/h)
45 mph (72.42 km/h)43.18 mph (69.49 km/h)
50 mph (80.47 km/h)47.98 mph (77.21 km/h)
55 mph (88.51 km/h)52.78 mph (84.94 km/h)
60 mph (96.56 km/h)57.57 mph (92.66 km/h)
65 mph (104.61 km/h)62.37 mph (100.38 km/h)
70 mph (112.65 km/h)67.17 mph (108.1 km/h)
75 mph (120.7 km/h)71.97 mph (115.82 km/h)
80 mph (128.75 km/h)76.77 mph (123.54 km/h)
85 mph (136.79 km/h)81.56 mph (131.27 km/h)
90 mph (144.84 km/h)86.36 mph (138.99 km/h)
95 mph (152.89 km/h)91.16 mph (146.71 km/h)
100 mph (160.93 km/h)95.96 mph (154.43 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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