Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/60r15 vs 295/50r15 Tire Comparison Side By Side
  325/60-15 295/50-15 Difference
Diameter inches (mm) 30.35 (771) 26.61 (676) -3.74 (-95) -12.3%
Width inches (mm) 12.8 (325) 11.61 (295) -1.18 (-30) -9.2%
Circum. inches (mm) 95.36 (2422.17) 83.61 (2123.72) -11.75 (-298.45) -12.3%
Sidewall Height inches (mm) 7.68 (195) 5.81 (147.5) -1.87 (-47.5) -24.4%
Revolutions per mile (km) 664.42 (412.85) 757.8 (470.87) 93.37 (58.02) 14.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.54 mph (28.22 km/h)
25 mph (40.23 km/h)21.92 mph (35.28 km/h)
30 mph (48.28 km/h)26.3 mph (42.33 km/h)
35 mph (56.33 km/h)30.69 mph (49.39 km/h)
40 mph (64.37 km/h)35.07 mph (56.44 km/h)
45 mph (72.42 km/h)39.46 mph (63.5 km/h)
50 mph (80.47 km/h)43.84 mph (70.55 km/h)
55 mph (88.51 km/h)48.22 mph (77.61 km/h)
60 mph (96.56 km/h)52.61 mph (84.66 km/h)
65 mph (104.61 km/h)56.99 mph (91.72 km/h)
70 mph (112.65 km/h)61.37 mph (98.77 km/h)
75 mph (120.7 km/h)65.76 mph (105.83 km/h)
80 mph (128.75 km/h)70.14 mph (112.88 km/h)
85 mph (136.79 km/h)74.53 mph (119.94 km/h)
90 mph (144.84 km/h)78.91 mph (126.99 km/h)
95 mph (152.89 km/h)83.29 mph (134.05 km/h)
100 mph (160.93 km/h)87.68 mph (141.1 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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