Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/30r19 vs 235/35r19 Tire Comparison Side By Side
  235/30-19 235/35-19 Difference
Diameter inches (mm) 24.55 (623.6) 25.48 (647.1) 0.93 (23.5) 3.8%
Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%
Circum. inches (mm) 77.13 (1959.1) 80.04 (2032.92) 2.91 (73.83) 3.8%
Sidewall Height inches (mm) 2.78 (70.5) 3.24 (82.25) 0.46 (11.75) 16.7%
Revolutions per mile (km) 821.47 (510.44) 791.64 (491.9) -29.83 (-18.54) -3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.75 mph (33.4 km/h)
25 mph (40.23 km/h)25.94 mph (41.75 km/h)
30 mph (48.28 km/h)31.13 mph (50.1 km/h)
35 mph (56.33 km/h)36.32 mph (58.45 km/h)
40 mph (64.37 km/h)41.51 mph (66.8 km/h)
45 mph (72.42 km/h)46.7 mph (75.15 km/h)
50 mph (80.47 km/h)51.88 mph (83.5 km/h)
55 mph (88.51 km/h)57.07 mph (91.85 km/h)
60 mph (96.56 km/h)62.26 mph (100.2 km/h)
65 mph (104.61 km/h)67.45 mph (108.55 km/h)
70 mph (112.65 km/h)72.64 mph (116.9 km/h)
75 mph (120.7 km/h)77.83 mph (125.25 km/h)
80 mph (128.75 km/h)83.01 mph (133.6 km/h)
85 mph (136.79 km/h)88.2 mph (141.95 km/h)
90 mph (144.84 km/h)93.39 mph (150.3 km/h)
95 mph (152.89 km/h)98.58 mph (158.65 km/h)
100 mph (160.93 km/h)103.77 mph (167 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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