Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
36/12.5r16.5 vs 37/12.5r16.5 Tire Comparison Side By Side
  36/12.5-16.5 37/12.5-16.5 Difference
Diameter inches (mm) 36.03 (915.18) 37.03 (940.62) 1 (25.44) 2.8%
Width inches (mm) 12.52 (318) 12.52 (318) 0 (0) 0%
Circum. inches (mm) 113.19 (2875.12) 116.34 (2955.04) 3.15 (79.92) 2.8%
Sidewall Height inches (mm) 9.77 (248.04) 10.27 (260.76) 0.5 (12.72) 5.1%
Revolutions per mile (km) 559.75 (347.81) 544.61 (338.4) -15.14 (-9.41) -2.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.56 mph (33.08 km/h)
25 mph (40.23 km/h)25.69 mph (41.35 km/h)
30 mph (48.28 km/h)30.83 mph (49.62 km/h)
35 mph (56.33 km/h)35.97 mph (57.89 km/h)
40 mph (64.37 km/h)41.11 mph (66.16 km/h)
45 mph (72.42 km/h)46.25 mph (74.43 km/h)
50 mph (80.47 km/h)51.39 mph (82.7 km/h)
55 mph (88.51 km/h)56.53 mph (90.97 km/h)
60 mph (96.56 km/h)61.67 mph (99.25 km/h)
65 mph (104.61 km/h)66.81 mph (107.52 km/h)
70 mph (112.65 km/h)71.95 mph (115.79 km/h)
75 mph (120.7 km/h)77.08 mph (124.06 km/h)
80 mph (128.75 km/h)82.22 mph (132.33 km/h)
85 mph (136.79 km/h)87.36 mph (140.6 km/h)
90 mph (144.84 km/h)92.5 mph (148.87 km/h)
95 mph (152.89 km/h)97.64 mph (157.14 km/h)
100 mph (160.93 km/h)102.78 mph (165.41 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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