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 36/9.5r16.5 Tire Comparison Side By Side
  36/12.5-16.5 36/9.5-16.5 Difference
Diameter inches (mm) 36.03 (915.18) 36.05 (915.56) 0.01 (0.38) 0%
Width inches (mm) 12.52 (318) 9.49 (241) -3.03 (-77) -24.2%
Circum. inches (mm) 113.19 (2875.12) 113.24 (2876.32) 0.05 (1.19) 0%
Sidewall Height inches (mm) 9.77 (248.04) 9.77 (248.23) 0.01 (0.19) 0.1%
Revolutions per mile (km) 559.75 (347.81) 559.52 (347.67) -0.23 (-0.14) -0%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.01 mph (32.2 km/h)
25 mph (40.23 km/h)25.01 mph (40.25 km/h)
30 mph (48.28 km/h)30.01 mph (48.3 km/h)
35 mph (56.33 km/h)35.01 mph (56.35 km/h)
40 mph (64.37 km/h)40.02 mph (64.4 km/h)
45 mph (72.42 km/h)45.02 mph (72.45 km/h)
50 mph (80.47 km/h)50.02 mph (80.5 km/h)
55 mph (88.51 km/h)55.02 mph (88.55 km/h)
60 mph (96.56 km/h)60.02 mph (96.6 km/h)
65 mph (104.61 km/h)65.03 mph (104.65 km/h)
70 mph (112.65 km/h)70.03 mph (112.7 km/h)
75 mph (120.7 km/h)75.03 mph (120.75 km/h)
80 mph (128.75 km/h)80.03 mph (128.8 km/h)
85 mph (136.79 km/h)85.04 mph (136.85 km/h)
90 mph (144.84 km/h)90.04 mph (144.9 km/h)
95 mph (152.89 km/h)95.04 mph (152.95 km/h)
100 mph (160.93 km/h)100.04 mph (161 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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