Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/35r22 vs 325/35r22 Tire Comparison Side By Side
  305/35-22 325/35-22 Difference
Diameter inches (mm) 30.41 (772.3) 30.96 (786.3) 0.55 (14) 1.8%
Width inches (mm) 12.01 (305) 12.8 (325) 0.79 (20) 6.6%
Circum. inches (mm) 95.52 (2426.25) 97.25 (2470.23) 1.73 (43.98) 1.8%
Sidewall Height inches (mm) 4.2 (106.75) 4.48 (113.75) 0.28 (7) 6.6%
Revolutions per mile (km) 663.3 (412.16) 651.49 (404.82) -11.81 (-7.34) -1.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.36 mph (32.77 km/h)
25 mph (40.23 km/h)25.45 mph (40.96 km/h)
30 mph (48.28 km/h)30.54 mph (49.16 km/h)
35 mph (56.33 km/h)35.63 mph (57.35 km/h)
40 mph (64.37 km/h)40.73 mph (65.54 km/h)
45 mph (72.42 km/h)45.82 mph (73.73 km/h)
50 mph (80.47 km/h)50.91 mph (81.93 km/h)
55 mph (88.51 km/h)56 mph (90.12 km/h)
60 mph (96.56 km/h)61.09 mph (98.31 km/h)
65 mph (104.61 km/h)66.18 mph (106.5 km/h)
70 mph (112.65 km/h)71.27 mph (114.7 km/h)
75 mph (120.7 km/h)76.36 mph (122.89 km/h)
80 mph (128.75 km/h)81.45 mph (131.08 km/h)
85 mph (136.79 km/h)86.54 mph (139.27 km/h)
90 mph (144.84 km/h)91.63 mph (147.47 km/h)
95 mph (152.89 km/h)96.72 mph (155.66 km/h)
100 mph (160.93 km/h)101.81 mph (163.85 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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