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 305/30r28 Tire Comparison Side By Side
  325/35-28 305/30-28 Difference
Diameter inches (mm) 36.96 (938.7) 35.2 (894.2) -1.75 (-44.5) -4.7%
Width inches (mm) 12.8 (325) 12.01 (305) -0.79 (-20) -6.2%
Circum. inches (mm) 116.1 (2949.01) 110.6 (2809.21) -5.5 (-139.8) -4.7%
Sidewall Height inches (mm) 4.48 (113.75) 3.6 (91.5) -0.88 (-22.25) -19.6%
Revolutions per mile (km) 545.72 (339.1) 572.88 (355.97) 27.16 (16.88) 5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.05 mph (30.66 km/h)
25 mph (40.23 km/h)23.81 mph (38.33 km/h)
30 mph (48.28 km/h)28.58 mph (45.99 km/h)
35 mph (56.33 km/h)33.34 mph (53.66 km/h)
40 mph (64.37 km/h)38.1 mph (61.32 km/h)
45 mph (72.42 km/h)42.87 mph (68.99 km/h)
50 mph (80.47 km/h)47.63 mph (76.65 km/h)
55 mph (88.51 km/h)52.39 mph (84.32 km/h)
60 mph (96.56 km/h)57.16 mph (91.98 km/h)
65 mph (104.61 km/h)61.92 mph (99.65 km/h)
70 mph (112.65 km/h)66.68 mph (107.31 km/h)
75 mph (120.7 km/h)71.44 mph (114.98 km/h)
80 mph (128.75 km/h)76.21 mph (122.64 km/h)
85 mph (136.79 km/h)80.97 mph (130.31 km/h)
90 mph (144.84 km/h)85.73 mph (137.97 km/h)
95 mph (152.89 km/h)90.5 mph (145.64 km/h)
100 mph (160.93 km/h)95.26 mph (153.31 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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