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 305/35r28 Tire Comparison Side By Side
  325/35-28 305/35-28 Difference
Diameter inches (mm) 36.96 (938.7) 36.41 (924.7) -0.55 (-14) -1.5%
Width inches (mm) 12.8 (325) 12.01 (305) -0.79 (-20) -6.2%
Circum. inches (mm) 116.1 (2949.01) 114.37 (2905.03) -1.73 (-43.98) -1.5%
Sidewall Height inches (mm) 4.48 (113.75) 4.2 (106.75) -0.28 (-7) -6.2%
Revolutions per mile (km) 545.72 (339.1) 553.99 (344.23) 8.26 (5.13) 1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.7 mph (31.71 km/h)
25 mph (40.23 km/h)24.63 mph (39.63 km/h)
30 mph (48.28 km/h)29.55 mph (47.56 km/h)
35 mph (56.33 km/h)34.48 mph (55.49 km/h)
40 mph (64.37 km/h)39.4 mph (63.41 km/h)
45 mph (72.42 km/h)44.33 mph (71.34 km/h)
50 mph (80.47 km/h)49.25 mph (79.27 km/h)
55 mph (88.51 km/h)54.18 mph (87.19 km/h)
60 mph (96.56 km/h)59.11 mph (95.12 km/h)
65 mph (104.61 km/h)64.03 mph (103.05 km/h)
70 mph (112.65 km/h)68.96 mph (110.97 km/h)
75 mph (120.7 km/h)73.88 mph (118.9 km/h)
80 mph (128.75 km/h)78.81 mph (126.83 km/h)
85 mph (136.79 km/h)83.73 mph (134.75 km/h)
90 mph (144.84 km/h)88.66 mph (142.68 km/h)
95 mph (152.89 km/h)93.58 mph (150.61 km/h)
100 mph (160.93 km/h)98.51 mph (158.53 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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