Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
180/80r13 vs 195/75r14 Tire Comparison Side By Side
  180/80-13 195/75-14 Difference
Diameter inches (mm) 24.34 (618.2) 25.52 (648.1) 1.18 (29.9) 4.8%
Width inches (mm) 7.09 (180) 7.68 (195) 0.59 (15) 8.3%
Circum. inches (mm) 76.46 (1942.13) 80.16 (2036.07) 3.7 (93.93) 4.8%
Sidewall Height inches (mm) 5.67 (144) 5.76 (146.25) 0.09 (2.25) 1.6%
Revolutions per mile (km) 828.65 (514.9) 790.42 (491.14) -38.23 (-23.75) -4.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.97 mph (33.74 km/h)
25 mph (40.23 km/h)26.21 mph (42.18 km/h)
30 mph (48.28 km/h)31.45 mph (50.62 km/h)
35 mph (56.33 km/h)36.69 mph (59.05 km/h)
40 mph (64.37 km/h)41.93 mph (67.49 km/h)
45 mph (72.42 km/h)47.18 mph (75.92 km/h)
50 mph (80.47 km/h)52.42 mph (84.36 km/h)
55 mph (88.51 km/h)57.66 mph (92.8 km/h)
60 mph (96.56 km/h)62.9 mph (101.23 km/h)
65 mph (104.61 km/h)68.14 mph (109.67 km/h)
70 mph (112.65 km/h)73.39 mph (118.1 km/h)
75 mph (120.7 km/h)78.63 mph (126.54 km/h)
80 mph (128.75 km/h)83.87 mph (134.97 km/h)
85 mph (136.79 km/h)89.11 mph (143.41 km/h)
90 mph (144.84 km/h)94.35 mph (151.85 km/h)
95 mph (152.89 km/h)99.59 mph (160.28 km/h)
100 mph (160.93 km/h)104.84 mph (168.72 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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