Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/80r19 vs 245/65r16 Tire Comparison Side By Side
  155/80-19 245/65-16 Difference
Diameter inches (mm) 28.76 (730.6) 28.54 (724.9) -0.22 (-5.7) -0.8%
Width inches (mm) 6.1 (155) 9.65 (245) 3.54 (90) 58.1%
Circum. inches (mm) 90.36 (2295.25) 89.66 (2277.34) -0.71 (-17.91) -0.8%
Sidewall Height inches (mm) 4.88 (124) 6.27 (159.25) 1.39 (35.25) 28.4%
Revolutions per mile (km) 701.16 (435.68) 706.68 (439.11) 5.51 (3.43) 0.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.84 mph (31.94 km/h)
25 mph (40.23 km/h)24.8 mph (39.92 km/h)
30 mph (48.28 km/h)29.77 mph (47.9 km/h)
35 mph (56.33 km/h)34.73 mph (55.89 km/h)
40 mph (64.37 km/h)39.69 mph (63.87 km/h)
45 mph (72.42 km/h)44.65 mph (71.86 km/h)
50 mph (80.47 km/h)49.61 mph (79.84 km/h)
55 mph (88.51 km/h)54.57 mph (87.82 km/h)
60 mph (96.56 km/h)59.53 mph (95.81 km/h)
65 mph (104.61 km/h)64.49 mph (103.79 km/h)
70 mph (112.65 km/h)69.45 mph (111.78 km/h)
75 mph (120.7 km/h)74.41 mph (119.76 km/h)
80 mph (128.75 km/h)79.38 mph (127.74 km/h)
85 mph (136.79 km/h)84.34 mph (135.73 km/h)
90 mph (144.84 km/h)89.3 mph (143.71 km/h)
95 mph (152.89 km/h)94.26 mph (151.7 km/h)
100 mph (160.93 km/h)99.22 mph (159.68 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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