Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/75r16 vs 195/70r14 Tire Comparison Side By Side
  225/75-16 195/70-14 Difference
Diameter inches (mm) 29.29 (743.9) 24.75 (628.6) -4.54 (-115.3) -15.5%
Width inches (mm) 8.86 (225) 7.68 (195) -1.18 (-30) -13.3%
Circum. inches (mm) 92.01 (2337.03) 77.75 (1974.81) -14.26 (-362.23) -15.5%
Sidewall Height inches (mm) 6.64 (168.75) 5.37 (136.5) -1.27 (-32.25) -19.1%
Revolutions per mile (km) 688.63 (427.89) 814.94 (506.38) 126.31 (78.49) 18.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)16.9 mph (27.2 km/h)
25 mph (40.23 km/h)21.13 mph (34 km/h)
30 mph (48.28 km/h)25.35 mph (40.8 km/h)
35 mph (56.33 km/h)29.58 mph (47.6 km/h)
40 mph (64.37 km/h)33.8 mph (54.4 km/h)
45 mph (72.42 km/h)38.03 mph (61.2 km/h)
50 mph (80.47 km/h)42.25 mph (68 km/h)
55 mph (88.51 km/h)46.48 mph (74.79 km/h)
60 mph (96.56 km/h)50.7 mph (81.59 km/h)
65 mph (104.61 km/h)54.93 mph (88.39 km/h)
70 mph (112.65 km/h)59.15 mph (95.19 km/h)
75 mph (120.7 km/h)63.38 mph (101.99 km/h)
80 mph (128.75 km/h)67.6 mph (108.79 km/h)
85 mph (136.79 km/h)71.83 mph (115.59 km/h)
90 mph (144.84 km/h)76.05 mph (122.39 km/h)
95 mph (152.89 km/h)80.28 mph (129.19 km/h)
100 mph (160.93 km/h)84.5 mph (135.99 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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