Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/90r16 vs 235/75r16 Tire Comparison Side By Side
  205/90-16 235/75-16 Difference
Diameter inches (mm) 30.53 (775.4) 29.88 (758.9) -0.65 (-16.5) -2.1%
Width inches (mm) 8.07 (205) 9.25 (235) 1.18 (30) 14.6%
Circum. inches (mm) 95.91 (2435.99) 93.86 (2384.15) -2.04 (-51.84) -2.1%
Sidewall Height inches (mm) 7.26 (184.5) 6.94 (176.25) -0.32 (-8.25) -4.5%
Revolutions per mile (km) 660.65 (410.51) 675.02 (419.44) 14.36 (8.93) 2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.57 mph (31.5 km/h)
25 mph (40.23 km/h)24.47 mph (39.38 km/h)
30 mph (48.28 km/h)29.36 mph (47.25 km/h)
35 mph (56.33 km/h)34.26 mph (55.13 km/h)
40 mph (64.37 km/h)39.15 mph (63 km/h)
45 mph (72.42 km/h)44.04 mph (70.88 km/h)
50 mph (80.47 km/h)48.94 mph (78.76 km/h)
55 mph (88.51 km/h)53.83 mph (86.63 km/h)
60 mph (96.56 km/h)58.72 mph (94.51 km/h)
65 mph (104.61 km/h)63.62 mph (102.38 km/h)
70 mph (112.65 km/h)68.51 mph (110.26 km/h)
75 mph (120.7 km/h)73.4 mph (118.13 km/h)
80 mph (128.75 km/h)78.3 mph (126.01 km/h)
85 mph (136.79 km/h)83.19 mph (133.88 km/h)
90 mph (144.84 km/h)88.08 mph (141.76 km/h)
95 mph (152.89 km/h)92.98 mph (149.63 km/h)
100 mph (160.93 km/h)97.87 mph (157.51 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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