Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/30r20 vs 275/35r20 Tire Comparison Side By Side
  275/30-20 275/35-20 Difference
Diameter inches (mm) 26.5 (673) 27.58 (700.5) 1.08 (27.5) 4.1%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 83.24 (2114.29) 86.64 (2200.69) 3.4 (86.39) 4.1%
Sidewall Height inches (mm) 3.25 (82.5) 3.79 (96.25) 0.54 (13.75) 16.7%
Revolutions per mile (km) 761.17 (472.97) 731.29 (454.4) -29.88 (-18.57) -3.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.82 mph (33.5 km/h)
25 mph (40.23 km/h)26.02 mph (41.88 km/h)
30 mph (48.28 km/h)31.23 mph (50.25 km/h)
35 mph (56.33 km/h)36.43 mph (58.63 km/h)
40 mph (64.37 km/h)41.63 mph (67 km/h)
45 mph (72.42 km/h)46.84 mph (75.38 km/h)
50 mph (80.47 km/h)52.04 mph (83.76 km/h)
55 mph (88.51 km/h)57.25 mph (92.13 km/h)
60 mph (96.56 km/h)62.45 mph (100.51 km/h)
65 mph (104.61 km/h)67.66 mph (108.88 km/h)
70 mph (112.65 km/h)72.86 mph (117.26 km/h)
75 mph (120.7 km/h)78.06 mph (125.63 km/h)
80 mph (128.75 km/h)83.27 mph (134.01 km/h)
85 mph (136.79 km/h)88.47 mph (142.38 km/h)
90 mph (144.84 km/h)93.68 mph (150.76 km/h)
95 mph (152.89 km/h)98.88 mph (159.14 km/h)
100 mph (160.93 km/h)104.09 mph (167.51 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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