Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
35/12.5r15 vs 325/70r15 Tire Comparison Side By Side
  35/12.5-15 325/70-15 Difference
Diameter inches (mm) 35.03 (889.8) 32.91 (836) -2.12 (-53.8) -6%
Width inches (mm) 12.52 (318) 12.8 (325) 0.28 (7) 2.2%
Circum. inches (mm) 110.05 (2795.39) 103.4 (2626.37) -6.65 (-169.02) -6%
Sidewall Height inches (mm) 10.02 (254.4) 8.96 (227.5) -1.06 (-26.9) -10.6%
Revolutions per mile (km) 575.71 (357.73) 612.76 (380.75) 37.05 (23.02) 6.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.79 mph (30.24 km/h)
25 mph (40.23 km/h)23.49 mph (37.8 km/h)
30 mph (48.28 km/h)28.19 mph (45.36 km/h)
35 mph (56.33 km/h)32.88 mph (52.92 km/h)
40 mph (64.37 km/h)37.58 mph (60.48 km/h)
45 mph (72.42 km/h)42.28 mph (68.04 km/h)
50 mph (80.47 km/h)46.98 mph (75.6 km/h)
55 mph (88.51 km/h)51.67 mph (83.16 km/h)
60 mph (96.56 km/h)56.37 mph (90.72 km/h)
65 mph (104.61 km/h)61.07 mph (98.28 km/h)
70 mph (112.65 km/h)65.77 mph (105.84 km/h)
75 mph (120.7 km/h)70.47 mph (113.4 km/h)
80 mph (128.75 km/h)75.16 mph (120.96 km/h)
85 mph (136.79 km/h)79.86 mph (128.52 km/h)
90 mph (144.84 km/h)84.56 mph (136.08 km/h)
95 mph (152.89 km/h)89.26 mph (143.64 km/h)
100 mph (160.93 km/h)93.95 mph (151.2 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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