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 315/85r15 Tire Comparison Side By Side
  35/12.5-15 315/85-15 Difference
Diameter inches (mm) 35.03 (889.8) 36.08 (916.5) 1.05 (26.7) 3%
Width inches (mm) 12.52 (318) 12.4 (315) -0.12 (-3) -0.9%
Circum. inches (mm) 110.05 (2795.39) 113.36 (2879.27) 3.3 (83.88) 3%
Sidewall Height inches (mm) 10.02 (254.4) 10.54 (267.75) 0.53 (13.35) 5.2%
Revolutions per mile (km) 575.71 (357.73) 558.94 (347.31) -16.77 (-10.42) -2.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.6 mph (33.15 km/h)
25 mph (40.23 km/h)25.75 mph (41.44 km/h)
30 mph (48.28 km/h)30.9 mph (49.73 km/h)
35 mph (56.33 km/h)36.05 mph (58.02 km/h)
40 mph (64.37 km/h)41.2 mph (66.31 km/h)
45 mph (72.42 km/h)46.35 mph (74.59 km/h)
50 mph (80.47 km/h)51.5 mph (82.88 km/h)
55 mph (88.51 km/h)56.65 mph (91.17 km/h)
60 mph (96.56 km/h)61.8 mph (99.46 km/h)
65 mph (104.61 km/h)66.95 mph (107.75 km/h)
70 mph (112.65 km/h)72.1 mph (116.03 km/h)
75 mph (120.7 km/h)77.25 mph (124.32 km/h)
80 mph (128.75 km/h)82.4 mph (132.61 km/h)
85 mph (136.79 km/h)87.55 mph (140.9 km/h)
90 mph (144.84 km/h)92.7 mph (149.19 km/h)
95 mph (152.89 km/h)97.85 mph (157.48 km/h)
100 mph (160.93 km/h)103 mph (165.76 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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