Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
180/80r14 vs 195/75r14 Tire Comparison Side By Side
  180/80-14 195/75-14 Difference
Diameter inches (mm) 25.34 (643.6) 25.52 (648.1) 0.18 (4.5) 0.7%
Width inches (mm) 7.09 (180) 7.68 (195) 0.59 (15) 8.3%
Circum. inches (mm) 79.6 (2021.93) 80.16 (2036.07) 0.56 (14.14) 0.7%
Sidewall Height inches (mm) 5.67 (144) 5.76 (146.25) 0.09 (2.25) 1.6%
Revolutions per mile (km) 795.94 (494.58) 790.42 (491.14) -5.53 (-3.43) -0.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.14 mph (32.41 km/h)
25 mph (40.23 km/h)25.17 mph (40.51 km/h)
30 mph (48.28 km/h)30.21 mph (48.62 km/h)
35 mph (56.33 km/h)35.24 mph (56.72 km/h)
40 mph (64.37 km/h)40.28 mph (64.82 km/h)
45 mph (72.42 km/h)45.31 mph (72.93 km/h)
50 mph (80.47 km/h)50.35 mph (81.03 km/h)
55 mph (88.51 km/h)55.38 mph (89.13 km/h)
60 mph (96.56 km/h)60.42 mph (97.24 km/h)
65 mph (104.61 km/h)65.45 mph (105.34 km/h)
70 mph (112.65 km/h)70.49 mph (113.44 km/h)
75 mph (120.7 km/h)75.52 mph (121.54 km/h)
80 mph (128.75 km/h)80.56 mph (129.65 km/h)
85 mph (136.79 km/h)85.59 mph (137.75 km/h)
90 mph (144.84 km/h)90.63 mph (145.85 km/h)
95 mph (152.89 km/h)95.66 mph (153.96 km/h)
100 mph (160.93 km/h)100.7 mph (162.06 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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