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 35/12.5r28 Tire Comparison Side By Side
  325/35-28 35/12.5-28 Difference
Diameter inches (mm) 36.96 (938.7) 35.01 (889.28) -1.95 (-49.42) -5.3%
Width inches (mm) 12.8 (325) 12.52 (318) -0.28 (-7) -2.2%
Circum. inches (mm) 116.1 (2949.01) 109.99 (2793.76) -6.11 (-155.26) -5.3%
Sidewall Height inches (mm) 4.48 (113.75) 3.51 (89.04) -0.97 (-24.71) -21.7%
Revolutions per mile (km) 545.72 (339.1) 576.05 (357.94) 30.33 (18.84) 5.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.95 mph (30.49 km/h)
25 mph (40.23 km/h)23.68 mph (38.12 km/h)
30 mph (48.28 km/h)28.42 mph (45.74 km/h)
35 mph (56.33 km/h)33.16 mph (53.36 km/h)
40 mph (64.37 km/h)37.89 mph (60.98 km/h)
45 mph (72.42 km/h)42.63 mph (68.61 km/h)
50 mph (80.47 km/h)47.37 mph (76.23 km/h)
55 mph (88.51 km/h)52.1 mph (83.85 km/h)
60 mph (96.56 km/h)56.84 mph (91.48 km/h)
65 mph (104.61 km/h)61.58 mph (99.1 km/h)
70 mph (112.65 km/h)66.31 mph (106.72 km/h)
75 mph (120.7 km/h)71.05 mph (114.35 km/h)
80 mph (128.75 km/h)75.79 mph (121.97 km/h)
85 mph (136.79 km/h)80.52 mph (129.59 km/h)
90 mph (144.84 km/h)85.26 mph (137.22 km/h)
95 mph (152.89 km/h)90 mph (144.84 km/h)
100 mph (160.93 km/h)94.74 mph (152.46 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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