Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/80r14 vs 195/70r14 Tire Comparison Side By Side
  155/80-14 195/70-14 Difference
Diameter inches (mm) 23.76 (603.6) 24.75 (628.6) 0.98 (25) 4.1%
Width inches (mm) 6.1 (155) 7.68 (195) 1.57 (40) 25.8%
Circum. inches (mm) 74.66 (1896.27) 77.75 (1974.81) 3.09 (78.54) 4.1%
Sidewall Height inches (mm) 4.88 (124) 5.37 (136.5) 0.49 (12.5) 10.1%
Revolutions per mile (km) 848.69 (527.35) 814.94 (506.38) -33.75 (-20.97) -4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.83 mph (33.52 km/h)
25 mph (40.23 km/h)26.04 mph (41.9 km/h)
30 mph (48.28 km/h)31.24 mph (50.28 km/h)
35 mph (56.33 km/h)36.45 mph (58.66 km/h)
40 mph (64.37 km/h)41.66 mph (67.04 km/h)
45 mph (72.42 km/h)46.86 mph (75.42 km/h)
50 mph (80.47 km/h)52.07 mph (83.8 km/h)
55 mph (88.51 km/h)57.28 mph (92.18 km/h)
60 mph (96.56 km/h)62.49 mph (100.56 km/h)
65 mph (104.61 km/h)67.69 mph (108.94 km/h)
70 mph (112.65 km/h)72.9 mph (117.32 km/h)
75 mph (120.7 km/h)78.11 mph (125.7 km/h)
80 mph (128.75 km/h)83.31 mph (134.08 km/h)
85 mph (136.79 km/h)88.52 mph (142.46 km/h)
90 mph (144.84 km/h)93.73 mph (150.84 km/h)
95 mph (152.89 km/h)98.93 mph (159.22 km/h)
100 mph (160.93 km/h)104.14 mph (167.6 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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