Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/60r13 vs 185/55r13 Tire Comparison Side By Side
  185/60-13 185/55-13 Difference
Diameter inches (mm) 21.74 (552.2) 21.01 (533.7) -0.73 (-18.5) -3.4%
Width inches (mm) 7.28 (185) 7.28 (185) 0 (0) 0%
Circum. inches (mm) 68.3 (1734.79) 66.01 (1676.67) -2.29 (-58.12) -3.4%
Sidewall Height inches (mm) 4.37 (111) 4.01 (101.75) -0.36 (-9.25) -8.3%
Revolutions per mile (km) 927.69 (576.44) 959.85 (596.42) 32.16 (19.98) 3.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.33 mph (31.11 km/h)
25 mph (40.23 km/h)24.16 mph (38.89 km/h)
30 mph (48.28 km/h)28.99 mph (46.66 km/h)
35 mph (56.33 km/h)33.83 mph (54.44 km/h)
40 mph (64.37 km/h)38.66 mph (62.22 km/h)
45 mph (72.42 km/h)43.49 mph (69.99 km/h)
50 mph (80.47 km/h)48.32 mph (77.77 km/h)
55 mph (88.51 km/h)53.16 mph (85.55 km/h)
60 mph (96.56 km/h)57.99 mph (93.33 km/h)
65 mph (104.61 km/h)62.82 mph (101.1 km/h)
70 mph (112.65 km/h)67.65 mph (108.88 km/h)
75 mph (120.7 km/h)72.49 mph (116.66 km/h)
80 mph (128.75 km/h)77.32 mph (124.43 km/h)
85 mph (136.79 km/h)82.15 mph (132.21 km/h)
90 mph (144.84 km/h)86.98 mph (139.99 km/h)
95 mph (152.89 km/h)91.82 mph (147.77 km/h)
100 mph (160.93 km/h)96.65 mph (155.54 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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