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 305/55r28 Tire Comparison Side By Side
  325/35-28 305/55-28 Difference
Diameter inches (mm) 36.96 (938.7) 41.21 (1046.7) 4.25 (108) 11.5%
Width inches (mm) 12.8 (325) 12.01 (305) -0.79 (-20) -6.2%
Circum. inches (mm) 116.1 (2949.01) 129.46 (3288.31) 13.36 (339.29) 11.5%
Sidewall Height inches (mm) 4.48 (113.75) 6.6 (167.75) 2.13 (54) 47.5%
Revolutions per mile (km) 545.72 (339.1) 489.41 (304.11) -56.31 (-34.99) -10.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.3 mph (35.89 km/h)
25 mph (40.23 km/h)27.88 mph (44.86 km/h)
30 mph (48.28 km/h)33.45 mph (53.84 km/h)
35 mph (56.33 km/h)39.03 mph (62.81 km/h)
40 mph (64.37 km/h)44.6 mph (71.78 km/h)
45 mph (72.42 km/h)50.18 mph (80.75 km/h)
50 mph (80.47 km/h)55.75 mph (89.73 km/h)
55 mph (88.51 km/h)61.33 mph (98.7 km/h)
60 mph (96.56 km/h)66.9 mph (107.67 km/h)
65 mph (104.61 km/h)72.48 mph (116.64 km/h)
70 mph (112.65 km/h)78.05 mph (125.62 km/h)
75 mph (120.7 km/h)83.63 mph (134.59 km/h)
80 mph (128.75 km/h)89.2 mph (143.56 km/h)
85 mph (136.79 km/h)94.78 mph (152.53 km/h)
90 mph (144.84 km/h)100.35 mph (161.51 km/h)
95 mph (152.89 km/h)105.93 mph (170.48 km/h)
100 mph (160.93 km/h)111.51 mph (179.45 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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