Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/55r21 vs 235/55r19 Tire Comparison Side By Side
  275/55-21 235/55-19 Difference
Diameter inches (mm) 32.91 (835.9) 29.18 (741.1) -3.73 (-94.8) -11.3%
Width inches (mm) 10.83 (275) 9.25 (235) -1.57 (-40) -14.5%
Circum. inches (mm) 103.39 (2626.06) 91.66 (2328.23) -11.73 (-297.82) -11.3%
Sidewall Height inches (mm) 5.95 (151.25) 5.09 (129.25) -0.87 (-22) -14.5%
Revolutions per mile (km) 612.84 (380.8) 691.23 (429.51) 78.39 (48.71) 12.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.73 mph (28.54 km/h)
25 mph (40.23 km/h)22.16 mph (35.67 km/h)
30 mph (48.28 km/h)26.6 mph (42.8 km/h)
35 mph (56.33 km/h)31.03 mph (49.94 km/h)
40 mph (64.37 km/h)35.46 mph (57.07 km/h)
45 mph (72.42 km/h)39.9 mph (64.21 km/h)
50 mph (80.47 km/h)44.33 mph (71.34 km/h)
55 mph (88.51 km/h)48.76 mph (78.48 km/h)
60 mph (96.56 km/h)53.2 mph (85.61 km/h)
65 mph (104.61 km/h)57.63 mph (92.74 km/h)
70 mph (112.65 km/h)62.06 mph (99.88 km/h)
75 mph (120.7 km/h)66.49 mph (107.01 km/h)
80 mph (128.75 km/h)70.93 mph (114.15 km/h)
85 mph (136.79 km/h)75.36 mph (121.28 km/h)
90 mph (144.84 km/h)79.79 mph (128.41 km/h)
95 mph (152.89 km/h)84.23 mph (135.55 km/h)
100 mph (160.93 km/h)88.66 mph (142.68 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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