Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
240/55r16 vs 245/80r16 Tire Comparison Side By Side
  240/55-16 245/80-16 Difference
Diameter inches (mm) 26.39 (670.4) 31.43 (798.4) 5.04 (128) 19.1%
Width inches (mm) 9.45 (240) 9.65 (245) 0.2 (5) 2.1%
Circum. inches (mm) 82.92 (2106.12) 98.75 (2508.25) 15.83 (402.12) 19.1%
Sidewall Height inches (mm) 5.2 (132) 7.72 (196) 2.52 (64) 48.5%
Revolutions per mile (km) 764.13 (474.81) 641.62 (398.68) -122.51 (-76.12) -16%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.82 mph (38.33 km/h)
25 mph (40.23 km/h)29.77 mph (47.92 km/h)
30 mph (48.28 km/h)35.73 mph (57.5 km/h)
35 mph (56.33 km/h)41.68 mph (67.08 km/h)
40 mph (64.37 km/h)47.64 mph (76.66 km/h)
45 mph (72.42 km/h)53.59 mph (86.25 km/h)
50 mph (80.47 km/h)59.55 mph (95.83 km/h)
55 mph (88.51 km/h)65.5 mph (105.41 km/h)
60 mph (96.56 km/h)71.46 mph (115 km/h)
65 mph (104.61 km/h)77.41 mph (124.58 km/h)
70 mph (112.65 km/h)83.37 mph (134.16 km/h)
75 mph (120.7 km/h)89.32 mph (143.75 km/h)
80 mph (128.75 km/h)95.27 mph (153.33 km/h)
85 mph (136.79 km/h)101.23 mph (162.91 km/h)
90 mph (144.84 km/h)107.18 mph (172.5 km/h)
95 mph (152.89 km/h)113.14 mph (182.08 km/h)
100 mph (160.93 km/h)119.09 mph (191.66 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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