Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
33/12.5r16.5 vs 33/12.5r20 Tire Comparison Side By Side
  33/12.5-16.5 33/12.5-20 Difference
Diameter inches (mm) 33.03 (838.86) 33.02 (838.72) -0.01 (-0.14) -0%
Width inches (mm) 12.52 (318) 12.52 (318) 0 (0) 0%
Circum. inches (mm) 103.75 (2635.36) 103.74 (2634.92) -0.02 (-0.44) -0%
Sidewall Height inches (mm) 8.26 (209.88) 6.51 (165.36) -1.75 (-44.52) -21.2%
Revolutions per mile (km) 610.67 (379.45) 610.78 (379.52) 0.1 (0.06) 0%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20 mph (32.18 km/h)
25 mph (40.23 km/h)25 mph (40.23 km/h)
30 mph (48.28 km/h)29.99 mph (48.27 km/h)
35 mph (56.33 km/h)34.99 mph (56.32 km/h)
40 mph (64.37 km/h)39.99 mph (64.36 km/h)
45 mph (72.42 km/h)44.99 mph (72.41 km/h)
50 mph (80.47 km/h)49.99 mph (80.45 km/h)
55 mph (88.51 km/h)54.99 mph (88.5 km/h)
60 mph (96.56 km/h)59.99 mph (96.54 km/h)
65 mph (104.61 km/h)64.99 mph (104.59 km/h)
70 mph (112.65 km/h)69.99 mph (112.64 km/h)
75 mph (120.7 km/h)74.99 mph (120.68 km/h)
80 mph (128.75 km/h)79.99 mph (128.73 km/h)
85 mph (136.79 km/h)84.99 mph (136.77 km/h)
90 mph (144.84 km/h)89.98 mph (144.82 km/h)
95 mph (152.89 km/h)94.98 mph (152.86 km/h)
100 mph (160.93 km/h)99.98 mph (160.91 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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