Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/35r28 vs 315/30r30 Tire Comparison Side By Side
  325/35-28 315/30-30 Difference
Diameter inches (mm) 36.96 (938.7) 37.44 (951) 0.48 (12.3) 1.3%
Width inches (mm) 12.8 (325) 12.4 (315) -0.39 (-10) -3.1%
Circum. inches (mm) 116.1 (2949.01) 117.62 (2987.65) 1.52 (38.64) 1.3%
Sidewall Height inches (mm) 4.48 (113.75) 3.72 (94.5) -0.76 (-19.25) -16.9%
Revolutions per mile (km) 545.72 (339.1) 538.66 (334.71) -7.06 (-4.39) -1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.26 mph (32.61 km/h)
25 mph (40.23 km/h)25.33 mph (40.76 km/h)
30 mph (48.28 km/h)30.39 mph (48.91 km/h)
35 mph (56.33 km/h)35.46 mph (57.07 km/h)
40 mph (64.37 km/h)40.52 mph (65.22 km/h)
45 mph (72.42 km/h)45.59 mph (73.37 km/h)
50 mph (80.47 km/h)50.66 mph (81.52 km/h)
55 mph (88.51 km/h)55.72 mph (89.67 km/h)
60 mph (96.56 km/h)60.79 mph (97.83 km/h)
65 mph (104.61 km/h)65.85 mph (105.98 km/h)
70 mph (112.65 km/h)70.92 mph (114.13 km/h)
75 mph (120.7 km/h)75.98 mph (122.28 km/h)
80 mph (128.75 km/h)81.05 mph (130.43 km/h)
85 mph (136.79 km/h)86.11 mph (138.59 km/h)
90 mph (144.84 km/h)91.18 mph (146.74 km/h)
95 mph (152.89 km/h)96.24 mph (154.89 km/h)
100 mph (160.93 km/h)101.31 mph (163.04 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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