Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/30r26 vs 33/13.5r26 Tire Comparison Side By Side
  305/30-26 33/13.5-26 Difference
Diameter inches (mm) 33.2 (843.4) 33.02 (838.76) -0.18 (-4.64) -0.6%
Width inches (mm) 12.01 (305) 13.5 (343) 1.5 (38) 12.5%
Circum. inches (mm) 104.32 (2649.62) 103.74 (2635.04) -0.57 (-14.58) -0.6%
Sidewall Height inches (mm) 3.6 (91.5) 3.51 (89.18) -0.09 (-2.32) -2.5%
Revolutions per mile (km) 607.39 (377.41) 610.75 (379.5) 3.36 (2.09) 0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.89 mph (32.01 km/h)
25 mph (40.23 km/h)24.86 mph (40.01 km/h)
30 mph (48.28 km/h)29.83 mph (48.01 km/h)
35 mph (56.33 km/h)34.81 mph (56.02 km/h)
40 mph (64.37 km/h)39.78 mph (64.02 km/h)
45 mph (72.42 km/h)44.75 mph (72.02 km/h)
50 mph (80.47 km/h)49.72 mph (80.02 km/h)
55 mph (88.51 km/h)54.7 mph (88.03 km/h)
60 mph (96.56 km/h)59.67 mph (96.03 km/h)
65 mph (104.61 km/h)64.64 mph (104.03 km/h)
70 mph (112.65 km/h)69.61 mph (112.03 km/h)
75 mph (120.7 km/h)74.59 mph (120.04 km/h)
80 mph (128.75 km/h)79.56 mph (128.04 km/h)
85 mph (136.79 km/h)84.53 mph (136.04 km/h)
90 mph (144.84 km/h)89.5 mph (144.04 km/h)
95 mph (152.89 km/h)94.48 mph (152.05 km/h)
100 mph (160.93 km/h)99.45 mph (160.05 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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