Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/82r15 vs 355/55r20 Tire Comparison Side By Side
  165/82-15 355/55-20 Difference
Diameter inches (mm) 25.65 (651.6) 35.37 (898.5) 9.72 (246.9) 37.9%
Width inches (mm) 6.5 (165) 13.98 (355) 7.48 (190) 115.2%
Circum. inches (mm) 80.59 (2047.06) 111.13 (2822.72) 30.54 (775.66) 37.9%
Sidewall Height inches (mm) 5.33 (135.3) 7.69 (195.25) 2.36 (59.95) 44.3%
Revolutions per mile (km) 786.17 (488.5) 570.14 (354.27) -216.03 (-134.24) -27.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)27.58 mph (44.38 km/h)
25 mph (40.23 km/h)34.47 mph (55.48 km/h)
30 mph (48.28 km/h)41.37 mph (66.57 km/h)
35 mph (56.33 km/h)48.26 mph (77.67 km/h)
40 mph (64.37 km/h)55.16 mph (88.77 km/h)
45 mph (72.42 km/h)62.05 mph (99.86 km/h)
50 mph (80.47 km/h)68.95 mph (110.96 km/h)
55 mph (88.51 km/h)75.84 mph (122.05 km/h)
60 mph (96.56 km/h)82.73 mph (133.15 km/h)
65 mph (104.61 km/h)89.63 mph (144.24 km/h)
70 mph (112.65 km/h)96.52 mph (155.34 km/h)
75 mph (120.7 km/h)103.42 mph (166.44 km/h)
80 mph (128.75 km/h)110.31 mph (177.53 km/h)
85 mph (136.79 km/h)117.21 mph (188.63 km/h)
90 mph (144.84 km/h)124.1 mph (199.72 km/h)
95 mph (152.89 km/h)131 mph (210.82 km/h)
100 mph (160.93 km/h)137.89 mph (221.92 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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