Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/35r19 vs 245/40r19 Tire Comparison Side By Side
  245/35-19 245/40-19 Difference
Diameter inches (mm) 25.75 (654.1) 26.72 (678.6) 0.96 (24.5) 3.7%
Width inches (mm) 9.65 (245) 9.65 (245) 0 (0) 0%
Circum. inches (mm) 80.9 (2054.92) 83.93 (2131.88) 3.03 (76.97) 3.7%
Sidewall Height inches (mm) 3.38 (85.75) 3.86 (98) 0.48 (12.25) 14.3%
Revolutions per mile (km) 783.17 (486.64) 754.89 (469.07) -28.28 (-17.57) -3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.75 mph (33.39 km/h)
25 mph (40.23 km/h)25.94 mph (41.74 km/h)
30 mph (48.28 km/h)31.12 mph (50.09 km/h)
35 mph (56.33 km/h)36.31 mph (58.44 km/h)
40 mph (64.37 km/h)41.5 mph (66.79 km/h)
45 mph (72.42 km/h)46.69 mph (75.13 km/h)
50 mph (80.47 km/h)51.87 mph (83.48 km/h)
55 mph (88.51 km/h)57.06 mph (91.83 km/h)
60 mph (96.56 km/h)62.25 mph (100.18 km/h)
65 mph (104.61 km/h)67.43 mph (108.53 km/h)
70 mph (112.65 km/h)72.62 mph (116.87 km/h)
75 mph (120.7 km/h)77.81 mph (125.22 km/h)
80 mph (128.75 km/h)83 mph (133.57 km/h)
85 mph (136.79 km/h)88.18 mph (141.92 km/h)
90 mph (144.84 km/h)93.37 mph (150.27 km/h)
95 mph (152.89 km/h)98.56 mph (158.61 km/h)
100 mph (160.93 km/h)103.75 mph (166.96 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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