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 335/60r15 Tire Comparison Side By Side
  325/60-15 335/60-15 Difference
Diameter inches (mm) 30.35 (771) 30.83 (783) 0.47 (12) 1.6%
Width inches (mm) 12.8 (325) 13.19 (335) 0.39 (10) 3.1%
Circum. inches (mm) 95.36 (2422.17) 96.85 (2459.87) 1.48 (37.7) 1.6%
Sidewall Height inches (mm) 7.68 (195) 7.91 (201) 0.24 (6) 3.1%
Revolutions per mile (km) 664.42 (412.85) 654.24 (406.53) -10.18 (-6.33) -1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.31 mph (32.69 km/h)
25 mph (40.23 km/h)25.39 mph (40.86 km/h)
30 mph (48.28 km/h)30.47 mph (49.03 km/h)
35 mph (56.33 km/h)35.54 mph (57.2 km/h)
40 mph (64.37 km/h)40.62 mph (65.38 km/h)
45 mph (72.42 km/h)45.7 mph (73.55 km/h)
50 mph (80.47 km/h)50.78 mph (81.72 km/h)
55 mph (88.51 km/h)55.86 mph (89.89 km/h)
60 mph (96.56 km/h)60.93 mph (98.06 km/h)
65 mph (104.61 km/h)66.01 mph (106.24 km/h)
70 mph (112.65 km/h)71.09 mph (114.41 km/h)
75 mph (120.7 km/h)76.17 mph (122.58 km/h)
80 mph (128.75 km/h)81.25 mph (130.75 km/h)
85 mph (136.79 km/h)86.32 mph (138.92 km/h)
90 mph (144.84 km/h)91.4 mph (147.1 km/h)
95 mph (152.89 km/h)96.48 mph (155.27 km/h)
100 mph (160.93 km/h)101.56 mph (163.44 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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