Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/80r17 vs 235/85r16 Tire Comparison Side By Side
  205/80-17 235/85-16 Difference
Diameter inches (mm) 29.91 (759.8) 31.73 (805.9) 1.81 (46.1) 6.1%
Width inches (mm) 8.07 (205) 9.25 (235) 1.18 (30) 14.6%
Circum. inches (mm) 93.98 (2386.98) 99.68 (2531.81) 5.7 (144.83) 6.1%
Sidewall Height inches (mm) 6.46 (164) 7.86 (199.75) 1.41 (35.75) 21.8%
Revolutions per mile (km) 674.22 (418.94) 635.65 (394.97) -38.57 (-23.96) -5.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.21 mph (34.14 km/h)
25 mph (40.23 km/h)26.52 mph (42.67 km/h)
30 mph (48.28 km/h)31.82 mph (51.21 km/h)
35 mph (56.33 km/h)37.12 mph (59.74 km/h)
40 mph (64.37 km/h)42.43 mph (68.28 km/h)
45 mph (72.42 km/h)47.73 mph (76.81 km/h)
50 mph (80.47 km/h)53.03 mph (85.35 km/h)
55 mph (88.51 km/h)58.34 mph (93.88 km/h)
60 mph (96.56 km/h)63.64 mph (102.42 km/h)
65 mph (104.61 km/h)68.94 mph (110.95 km/h)
70 mph (112.65 km/h)74.25 mph (119.49 km/h)
75 mph (120.7 km/h)79.55 mph (128.02 km/h)
80 mph (128.75 km/h)84.85 mph (136.56 km/h)
85 mph (136.79 km/h)90.16 mph (145.09 km/h)
90 mph (144.84 km/h)95.46 mph (153.63 km/h)
95 mph (152.89 km/h)100.76 mph (162.16 km/h)
100 mph (160.93 km/h)106.07 mph (170.7 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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