Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/75r20 vs 35/11.5r20 Tire Comparison Side By Side
  305/75-20 35/11.5-20 Difference
Diameter inches (mm) 38.01 (965.5) 34.94 (887.6) -3.07 (-77.9) -8.1%
Width inches (mm) 12.01 (305) 11.5 (292) -0.51 (-13) -4.3%
Circum. inches (mm) 119.42 (3033.21) 109.78 (2788.48) -9.64 (-244.73) -8.1%
Sidewall Height inches (mm) 9.01 (228.75) 7.47 (189.8) -1.53 (-38.95) -17%
Revolutions per mile (km) 530.57 (329.68) 577.14 (358.62) 46.57 (28.93) 8.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.39 mph (29.59 km/h)
25 mph (40.23 km/h)22.98 mph (36.99 km/h)
30 mph (48.28 km/h)27.58 mph (44.38 km/h)
35 mph (56.33 km/h)32.18 mph (51.78 km/h)
40 mph (64.37 km/h)36.77 mph (59.18 km/h)
45 mph (72.42 km/h)41.37 mph (66.58 km/h)
50 mph (80.47 km/h)45.97 mph (73.97 km/h)
55 mph (88.51 km/h)50.56 mph (81.37 km/h)
60 mph (96.56 km/h)55.16 mph (88.77 km/h)
65 mph (104.61 km/h)59.76 mph (96.17 km/h)
70 mph (112.65 km/h)64.35 mph (103.56 km/h)
75 mph (120.7 km/h)68.95 mph (110.96 km/h)
80 mph (128.75 km/h)73.55 mph (118.36 km/h)
85 mph (136.79 km/h)78.14 mph (125.76 km/h)
90 mph (144.84 km/h)82.74 mph (133.15 km/h)
95 mph (152.89 km/h)87.34 mph (140.55 km/h)
100 mph (160.93 km/h)91.93 mph (147.95 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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