Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/35r19 vs 235/35r20 Tire Comparison Side By Side
  235/35-19 235/35-20 Difference
Diameter inches (mm) 25.48 (647.1) 26.48 (672.5) 1 (25.4) 3.9%
Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%
Circum. inches (mm) 80.04 (2032.92) 83.18 (2112.72) 3.14 (79.8) 3.9%
Sidewall Height inches (mm) 3.24 (82.25) 3.24 (82.25) 0 (0) 0%
Revolutions per mile (km) 791.64 (491.9) 761.74 (473.32) -29.9 (-18.58) -3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.79 mph (33.45 km/h)
25 mph (40.23 km/h)25.98 mph (41.81 km/h)
30 mph (48.28 km/h)31.18 mph (50.18 km/h)
35 mph (56.33 km/h)36.37 mph (58.54 km/h)
40 mph (64.37 km/h)41.57 mph (66.9 km/h)
45 mph (72.42 km/h)46.77 mph (75.26 km/h)
50 mph (80.47 km/h)51.96 mph (83.63 km/h)
55 mph (88.51 km/h)57.16 mph (91.99 km/h)
60 mph (96.56 km/h)62.36 mph (100.35 km/h)
65 mph (104.61 km/h)67.55 mph (108.71 km/h)
70 mph (112.65 km/h)72.75 mph (117.08 km/h)
75 mph (120.7 km/h)77.94 mph (125.44 km/h)
80 mph (128.75 km/h)83.14 mph (133.8 km/h)
85 mph (136.79 km/h)88.34 mph (142.16 km/h)
90 mph (144.84 km/h)93.53 mph (150.53 km/h)
95 mph (152.89 km/h)98.73 mph (158.89 km/h)
100 mph (160.93 km/h)103.93 mph (167.25 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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