Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/55r13 vs 175/80r13 Tire Comparison Side By Side
  165/55-13 175/80-13 Difference
Diameter inches (mm) 20.15 (511.7) 24.02 (610.2) 3.88 (98.5) 19.2%
Width inches (mm) 6.5 (165) 6.89 (175) 0.39 (10) 6.1%
Circum. inches (mm) 63.29 (1607.55) 75.47 (1917) 12.18 (309.45) 19.2%
Sidewall Height inches (mm) 3.57 (90.75) 5.51 (140) 1.94 (49.25) 54.3%
Revolutions per mile (km) 1001.11 (622.06) 839.51 (521.65) -161.6 (-100.41) -16.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.85 mph (38.38 km/h)
25 mph (40.23 km/h)29.81 mph (47.98 km/h)
30 mph (48.28 km/h)35.77 mph (57.57 km/h)
35 mph (56.33 km/h)41.74 mph (67.17 km/h)
40 mph (64.37 km/h)47.7 mph (76.77 km/h)
45 mph (72.42 km/h)53.66 mph (86.36 km/h)
50 mph (80.47 km/h)59.62 mph (95.96 km/h)
55 mph (88.51 km/h)65.59 mph (105.55 km/h)
60 mph (96.56 km/h)71.55 mph (115.15 km/h)
65 mph (104.61 km/h)77.51 mph (124.74 km/h)
70 mph (112.65 km/h)83.47 mph (134.34 km/h)
75 mph (120.7 km/h)89.44 mph (143.94 km/h)
80 mph (128.75 km/h)95.4 mph (153.53 km/h)
85 mph (136.79 km/h)101.36 mph (163.13 km/h)
90 mph (144.84 km/h)107.32 mph (172.72 km/h)
95 mph (152.89 km/h)113.29 mph (182.32 km/h)
100 mph (160.93 km/h)119.25 mph (191.91 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
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