Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/50r13 vs 185/60r13 Tire Comparison Side By Side
  175/50-13 185/60-13 Difference
Diameter inches (mm) 19.89 (505.2) 21.74 (552.2) 1.85 (47) 9.3%
Width inches (mm) 6.89 (175) 7.28 (185) 0.39 (10) 5.7%
Circum. inches (mm) 62.49 (1587.13) 68.3 (1734.79) 5.81 (147.65) 9.3%
Sidewall Height inches (mm) 3.44 (87.5) 4.37 (111) 0.93 (23.5) 26.9%
Revolutions per mile (km) 1013.99 (630.07) 927.69 (576.44) -86.31 (-53.63) -8.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.86 mph (35.18 km/h)
25 mph (40.23 km/h)27.33 mph (43.98 km/h)
30 mph (48.28 km/h)32.79 mph (52.77 km/h)
35 mph (56.33 km/h)38.26 mph (61.57 km/h)
40 mph (64.37 km/h)43.72 mph (70.36 km/h)
45 mph (72.42 km/h)49.19 mph (79.16 km/h)
50 mph (80.47 km/h)54.65 mph (87.95 km/h)
55 mph (88.51 km/h)60.12 mph (96.75 km/h)
60 mph (96.56 km/h)65.58 mph (105.54 km/h)
65 mph (104.61 km/h)71.05 mph (114.34 km/h)
70 mph (112.65 km/h)76.51 mph (123.13 km/h)
75 mph (120.7 km/h)81.98 mph (131.93 km/h)
80 mph (128.75 km/h)87.44 mph (140.73 km/h)
85 mph (136.79 km/h)92.91 mph (149.52 km/h)
90 mph (144.84 km/h)98.37 mph (158.32 km/h)
95 mph (152.89 km/h)103.84 mph (167.11 km/h)
100 mph (160.93 km/h)109.3 mph (175.91 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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