Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/80r13 vs 195/70r14 Tire Comparison Side By Side
  175/80-13 195/70-14 Difference
Diameter inches (mm) 24.02 (610.2) 24.75 (628.6) 0.72 (18.4) 3%
Width inches (mm) 6.89 (175) 7.68 (195) 0.79 (20) 11.4%
Circum. inches (mm) 75.47 (1917) 77.75 (1974.81) 2.28 (57.81) 3%
Sidewall Height inches (mm) 5.51 (140) 5.37 (136.5) -0.14 (-3.5) -2.5%
Revolutions per mile (km) 839.51 (521.65) 814.94 (506.38) -24.57 (-15.27) -2.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.6 mph (33.16 km/h)
25 mph (40.23 km/h)25.75 mph (41.45 km/h)
30 mph (48.28 km/h)30.9 mph (49.74 km/h)
35 mph (56.33 km/h)36.06 mph (58.03 km/h)
40 mph (64.37 km/h)41.21 mph (66.32 km/h)
45 mph (72.42 km/h)46.36 mph (74.6 km/h)
50 mph (80.47 km/h)51.51 mph (82.89 km/h)
55 mph (88.51 km/h)56.66 mph (91.18 km/h)
60 mph (96.56 km/h)61.81 mph (99.47 km/h)
65 mph (104.61 km/h)66.96 mph (107.76 km/h)
70 mph (112.65 km/h)72.11 mph (116.05 km/h)
75 mph (120.7 km/h)77.26 mph (124.34 km/h)
80 mph (128.75 km/h)82.41 mph (132.63 km/h)
85 mph (136.79 km/h)87.56 mph (140.92 km/h)
90 mph (144.84 km/h)92.71 mph (149.21 km/h)
95 mph (152.89 km/h)97.86 mph (157.5 km/h)
100 mph (160.93 km/h)103.02 mph (165.79 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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