Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/60r14 vs 185/55r15 Tire Comparison Side By Side
  185/60-14 185/55-15 Difference
Diameter inches (mm) 22.74 (577.6) 23.01 (584.5) 0.27 (6.9) 1.2%
Width inches (mm) 7.28 (185) 7.28 (185) 0 (0) 0%
Circum. inches (mm) 71.44 (1814.58) 72.29 (1836.26) 0.85 (21.68) 1.2%
Sidewall Height inches (mm) 4.37 (111) 4.01 (101.75) -0.36 (-9.25) -8.3%
Revolutions per mile (km) 886.89 (551.09) 876.42 (544.58) -10.47 (-6.51) -1.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.24 mph (32.57 km/h)
25 mph (40.23 km/h)25.3 mph (40.71 km/h)
30 mph (48.28 km/h)30.36 mph (48.86 km/h)
35 mph (56.33 km/h)35.42 mph (57 km/h)
40 mph (64.37 km/h)40.48 mph (65.14 km/h)
45 mph (72.42 km/h)45.54 mph (73.29 km/h)
50 mph (80.47 km/h)50.6 mph (81.43 km/h)
55 mph (88.51 km/h)55.66 mph (89.57 km/h)
60 mph (96.56 km/h)60.72 mph (97.71 km/h)
65 mph (104.61 km/h)65.78 mph (105.86 km/h)
70 mph (112.65 km/h)70.84 mph (114 km/h)
75 mph (120.7 km/h)75.9 mph (122.14 km/h)
80 mph (128.75 km/h)80.96 mph (130.29 km/h)
85 mph (136.79 km/h)86.02 mph (138.43 km/h)
90 mph (144.84 km/h)91.08 mph (146.57 km/h)
95 mph (152.89 km/h)96.13 mph (154.71 km/h)
100 mph (160.93 km/h)101.19 mph (162.86 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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