Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/55r18 vs 235/55r19 Tire Comparison Side By Side
  235/55-18 235/55-19 Difference
Diameter inches (mm) 28.18 (715.7) 29.18 (741.1) 1 (25.4) 3.5%
Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%
Circum. inches (mm) 88.52 (2248.44) 91.66 (2328.23) 3.14 (79.8) 3.5%
Sidewall Height inches (mm) 5.09 (129.25) 5.09 (129.25) 0 (0) 0%
Revolutions per mile (km) 715.76 (444.75) 691.23 (429.51) -24.53 (-15.24) -3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.71 mph (33.33 km/h)
25 mph (40.23 km/h)25.89 mph (41.66 km/h)
30 mph (48.28 km/h)31.06 mph (49.99 km/h)
35 mph (56.33 km/h)36.24 mph (58.33 km/h)
40 mph (64.37 km/h)41.42 mph (66.66 km/h)
45 mph (72.42 km/h)46.6 mph (74.99 km/h)
50 mph (80.47 km/h)51.77 mph (83.32 km/h)
55 mph (88.51 km/h)56.95 mph (91.66 km/h)
60 mph (96.56 km/h)62.13 mph (99.99 km/h)
65 mph (104.61 km/h)67.31 mph (108.32 km/h)
70 mph (112.65 km/h)72.48 mph (116.65 km/h)
75 mph (120.7 km/h)77.66 mph (124.98 km/h)
80 mph (128.75 km/h)82.84 mph (133.32 km/h)
85 mph (136.79 km/h)88.02 mph (141.65 km/h)
90 mph (144.84 km/h)93.19 mph (149.98 km/h)
95 mph (152.89 km/h)98.37 mph (158.31 km/h)
100 mph (160.93 km/h)103.55 mph (166.65 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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