Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r19.5 vs 225/75r19.5 Tire Comparison Side By Side
  245/75-19.5 225/75-19.5 Difference
Diameter inches (mm) 33.97 (862.8) 32.79 (832.8) -1.18 (-30) -3.5%
Width inches (mm) 9.65 (245) 8.86 (225) -0.79 (-20) -8.2%
Circum. inches (mm) 106.72 (2710.57) 103 (2616.32) -3.71 (-94.25) -3.5%
Sidewall Height inches (mm) 7.23 (183.75) 6.64 (168.75) -0.59 (-15) -8.2%
Revolutions per mile (km) 593.73 (368.93) 615.12 (382.22) 21.39 (13.29) 3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.3 mph (31.07 km/h)
25 mph (40.23 km/h)24.13 mph (38.83 km/h)
30 mph (48.28 km/h)28.96 mph (46.6 km/h)
35 mph (56.33 km/h)33.78 mph (54.37 km/h)
40 mph (64.37 km/h)38.61 mph (62.14 km/h)
45 mph (72.42 km/h)43.44 mph (69.9 km/h)
50 mph (80.47 km/h)48.26 mph (77.67 km/h)
55 mph (88.51 km/h)53.09 mph (85.44 km/h)
60 mph (96.56 km/h)57.91 mph (93.2 km/h)
65 mph (104.61 km/h)62.74 mph (100.97 km/h)
70 mph (112.65 km/h)67.57 mph (108.74 km/h)
75 mph (120.7 km/h)72.39 mph (116.5 km/h)
80 mph (128.75 km/h)77.22 mph (124.27 km/h)
85 mph (136.79 km/h)82.04 mph (132.04 km/h)
90 mph (144.84 km/h)86.87 mph (139.81 km/h)
95 mph (152.89 km/h)91.7 mph (147.57 km/h)
100 mph (160.93 km/h)96.52 mph (155.34 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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