Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/40r10 vs 205/50r10 Tire Comparison Side By Side
  255/40-10 205/50-10 Difference
Diameter inches (mm) 18.03 (458) 18.07 (459) 0.04 (1) 0.2%
Width inches (mm) 10.04 (255) 8.07 (205) -1.97 (-50) -19.6%
Circum. inches (mm) 56.65 (1438.85) 56.77 (1441.99) 0.12 (3.14) 0.2%
Sidewall Height inches (mm) 4.02 (102) 4.04 (102.5) 0.02 (0.5) 0.5%
Revolutions per mile (km) 1118.49 (695) 1116.06 (693.48) -2.44 (-1.51) -0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.04 mph (32.26 km/h)
25 mph (40.23 km/h)25.05 mph (40.32 km/h)
30 mph (48.28 km/h)30.07 mph (48.39 km/h)
35 mph (56.33 km/h)35.08 mph (56.45 km/h)
40 mph (64.37 km/h)40.09 mph (64.51 km/h)
45 mph (72.42 km/h)45.1 mph (72.58 km/h)
50 mph (80.47 km/h)50.11 mph (80.64 km/h)
55 mph (88.51 km/h)55.12 mph (88.71 km/h)
60 mph (96.56 km/h)60.13 mph (96.77 km/h)
65 mph (104.61 km/h)65.14 mph (104.84 km/h)
70 mph (112.65 km/h)70.15 mph (112.9 km/h)
75 mph (120.7 km/h)75.16 mph (120.96 km/h)
80 mph (128.75 km/h)80.17 mph (129.03 km/h)
85 mph (136.79 km/h)85.19 mph (137.09 km/h)
90 mph (144.84 km/h)90.2 mph (145.16 km/h)
95 mph (152.89 km/h)95.21 mph (153.22 km/h)
100 mph (160.93 km/h)100.22 mph (161.29 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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