Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/45r17 vs 265/35r20 Tire Comparison Side By Side
  325/45-17 265/35-20 Difference
Diameter inches (mm) 28.52 (724.3) 27.3 (693.5) -1.21 (-30.8) -4.3%
Width inches (mm) 12.8 (325) 10.43 (265) -2.36 (-60) -18.5%
Circum. inches (mm) 89.58 (2275.46) 85.78 (2178.69) -3.81 (-96.76) -4.3%
Sidewall Height inches (mm) 5.76 (146.25) 3.65 (92.75) -2.11 (-53.5) -36.6%
Revolutions per mile (km) 707.26 (439.47) 738.67 (458.99) 31.41 (19.52) 4.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.15 mph (30.82 km/h)
25 mph (40.23 km/h)23.94 mph (38.52 km/h)
30 mph (48.28 km/h)28.72 mph (46.23 km/h)
35 mph (56.33 km/h)33.51 mph (53.93 km/h)
40 mph (64.37 km/h)38.3 mph (61.64 km/h)
45 mph (72.42 km/h)43.09 mph (69.34 km/h)
50 mph (80.47 km/h)47.87 mph (77.05 km/h)
55 mph (88.51 km/h)52.66 mph (84.75 km/h)
60 mph (96.56 km/h)57.45 mph (92.45 km/h)
65 mph (104.61 km/h)62.24 mph (100.16 km/h)
70 mph (112.65 km/h)67.02 mph (107.86 km/h)
75 mph (120.7 km/h)71.81 mph (115.57 km/h)
80 mph (128.75 km/h)76.6 mph (123.27 km/h)
85 mph (136.79 km/h)81.39 mph (130.98 km/h)
90 mph (144.84 km/h)86.17 mph (138.68 km/h)
95 mph (152.89 km/h)90.96 mph (146.39 km/h)
100 mph (160.93 km/h)95.75 mph (154.09 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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