Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
335/30r20 vs 355/35r20 Tire Comparison Side By Side
  335/30-20 355/35-20 Difference
Diameter inches (mm) 27.91 (709) 29.78 (756.5) 1.87 (47.5) 6.7%
Width inches (mm) 13.19 (335) 13.98 (355) 0.79 (20) 6%
Circum. inches (mm) 87.69 (2227.39) 93.57 (2376.61) 5.88 (149.23) 6.7%
Sidewall Height inches (mm) 3.96 (100.5) 4.89 (124.25) 0.94 (23.75) 23.6%
Revolutions per mile (km) 722.52 (448.96) 677.16 (420.77) -45.37 (-28.19) -6.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.34 mph (34.34 km/h)
25 mph (40.23 km/h)26.67 mph (42.93 km/h)
30 mph (48.28 km/h)32.01 mph (51.51 km/h)
35 mph (56.33 km/h)37.34 mph (60.1 km/h)
40 mph (64.37 km/h)42.68 mph (68.69 km/h)
45 mph (72.42 km/h)48.01 mph (77.27 km/h)
50 mph (80.47 km/h)53.35 mph (85.86 km/h)
55 mph (88.51 km/h)58.68 mph (94.44 km/h)
60 mph (96.56 km/h)64.02 mph (103.03 km/h)
65 mph (104.61 km/h)69.35 mph (111.62 km/h)
70 mph (112.65 km/h)74.69 mph (120.2 km/h)
75 mph (120.7 km/h)80.02 mph (128.79 km/h)
80 mph (128.75 km/h)85.36 mph (137.37 km/h)
85 mph (136.79 km/h)90.69 mph (145.96 km/h)
90 mph (144.84 km/h)96.03 mph (154.54 km/h)
95 mph (152.89 km/h)101.36 mph (163.13 km/h)
100 mph (160.93 km/h)106.7 mph (171.72 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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