Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/80r14 vs 185/80r14 Tire Comparison Side By Side
  175/80-14 185/80-14 Difference
Diameter inches (mm) 25.02 (635.6) 25.65 (651.6) 0.63 (16) 2.5%
Width inches (mm) 6.89 (175) 7.28 (185) 0.39 (10) 5.7%
Circum. inches (mm) 78.61 (1996.8) 80.59 (2047.06) 1.98 (50.27) 2.5%
Sidewall Height inches (mm) 5.51 (140) 5.83 (148) 0.31 (8) 5.7%
Revolutions per mile (km) 805.96 (500.8) 786.17 (488.5) -19.79 (-12.3) -2.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.5 mph (33 km/h)
25 mph (40.23 km/h)25.63 mph (41.25 km/h)
30 mph (48.28 km/h)30.76 mph (49.5 km/h)
35 mph (56.33 km/h)35.88 mph (57.75 km/h)
40 mph (64.37 km/h)41.01 mph (65.99 km/h)
45 mph (72.42 km/h)46.13 mph (74.24 km/h)
50 mph (80.47 km/h)51.26 mph (82.49 km/h)
55 mph (88.51 km/h)56.38 mph (90.74 km/h)
60 mph (96.56 km/h)61.51 mph (98.99 km/h)
65 mph (104.61 km/h)66.64 mph (107.24 km/h)
70 mph (112.65 km/h)71.76 mph (115.49 km/h)
75 mph (120.7 km/h)76.89 mph (123.74 km/h)
80 mph (128.75 km/h)82.01 mph (131.99 km/h)
85 mph (136.79 km/h)87.14 mph (140.24 km/h)
90 mph (144.84 km/h)92.27 mph (148.49 km/h)
95 mph (152.89 km/h)97.39 mph (156.74 km/h)
100 mph (160.93 km/h)102.52 mph (164.99 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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