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 325/35r26 Tire Comparison Side By Side
  325/35-28 325/35-26 Difference
Diameter inches (mm) 36.96 (938.7) 34.96 (887.9) -2 (-50.8) -5.4%
Width inches (mm) 12.8 (325) 12.8 (325) 0 (0) 0%
Circum. inches (mm) 116.1 (2949.01) 109.82 (2789.42) -6.28 (-159.59) -5.4%
Sidewall Height inches (mm) 4.48 (113.75) 4.48 (113.75) 0 (0) 0%
Revolutions per mile (km) 545.72 (339.1) 576.95 (358.5) 31.22 (19.4) 5.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.92 mph (30.45 km/h)
25 mph (40.23 km/h)23.65 mph (38.06 km/h)
30 mph (48.28 km/h)28.38 mph (45.67 km/h)
35 mph (56.33 km/h)33.11 mph (53.28 km/h)
40 mph (64.37 km/h)37.84 mph (60.89 km/h)
45 mph (72.42 km/h)42.56 mph (68.5 km/h)
50 mph (80.47 km/h)47.29 mph (76.11 km/h)
55 mph (88.51 km/h)52.02 mph (83.72 km/h)
60 mph (96.56 km/h)56.75 mph (91.34 km/h)
65 mph (104.61 km/h)61.48 mph (98.95 km/h)
70 mph (112.65 km/h)66.21 mph (106.56 km/h)
75 mph (120.7 km/h)70.94 mph (114.17 km/h)
80 mph (128.75 km/h)75.67 mph (121.78 km/h)
85 mph (136.79 km/h)80.4 mph (129.39 km/h)
90 mph (144.84 km/h)85.13 mph (137 km/h)
95 mph (152.89 km/h)89.86 mph (144.61 km/h)
100 mph (160.93 km/h)94.59 mph (152.23 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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