Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/55r16 vs 215/65r16 Tire Comparison Side By Side
  235/55-16 215/65-16 Difference
Diameter inches (mm) 26.18 (664.9) 27 (685.9) 0.83 (21) 3.2%
Width inches (mm) 9.25 (235) 8.46 (215) -0.79 (-20) -8.5%
Circum. inches (mm) 82.24 (2088.84) 84.84 (2154.82) 2.6 (65.97) 3.2%
Sidewall Height inches (mm) 5.09 (129.25) 5.5 (139.75) 0.41 (10.5) 8.1%
Revolutions per mile (km) 770.45 (478.73) 746.86 (464.08) -23.59 (-14.66) -3.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.63 mph (33.2 km/h)
25 mph (40.23 km/h)25.79 mph (41.5 km/h)
30 mph (48.28 km/h)30.95 mph (49.81 km/h)
35 mph (56.33 km/h)36.11 mph (58.11 km/h)
40 mph (64.37 km/h)41.26 mph (66.41 km/h)
45 mph (72.42 km/h)46.42 mph (74.71 km/h)
50 mph (80.47 km/h)51.58 mph (83.01 km/h)
55 mph (88.51 km/h)56.74 mph (91.31 km/h)
60 mph (96.56 km/h)61.9 mph (99.61 km/h)
65 mph (104.61 km/h)67.05 mph (107.91 km/h)
70 mph (112.65 km/h)72.21 mph (116.21 km/h)
75 mph (120.7 km/h)77.37 mph (124.51 km/h)
80 mph (128.75 km/h)82.53 mph (132.81 km/h)
85 mph (136.79 km/h)87.68 mph (141.11 km/h)
90 mph (144.84 km/h)92.84 mph (149.42 km/h)
95 mph (152.89 km/h)98 mph (157.72 km/h)
100 mph (160.93 km/h)103.16 mph (166.02 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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