Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/50r16 vs 255/40r16 Tire Comparison Side By Side
  255/50-16 255/40-16 Difference
Diameter inches (mm) 26.04 (661.4) 24.03 (610.4) -2.01 (-51) -7.7%
Width inches (mm) 10.04 (255) 10.04 (255) 0 (0) 0%
Circum. inches (mm) 81.81 (2077.85) 75.5 (1917.63) -6.31 (-160.22) -7.7%
Sidewall Height inches (mm) 5.02 (127.5) 4.02 (102) -1 (-25.5) -20%
Revolutions per mile (km) 774.52 (481.27) 839.24 (521.48) 64.71 (40.21) 8.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.46 mph (29.71 km/h)
25 mph (40.23 km/h)23.07 mph (37.13 km/h)
30 mph (48.28 km/h)27.69 mph (44.56 km/h)
35 mph (56.33 km/h)32.3 mph (51.98 km/h)
40 mph (64.37 km/h)36.92 mph (59.41 km/h)
45 mph (72.42 km/h)41.53 mph (66.84 km/h)
50 mph (80.47 km/h)46.14 mph (74.26 km/h)
55 mph (88.51 km/h)50.76 mph (81.69 km/h)
60 mph (96.56 km/h)55.37 mph (89.12 km/h)
65 mph (104.61 km/h)59.99 mph (96.54 km/h)
70 mph (112.65 km/h)64.6 mph (103.97 km/h)
75 mph (120.7 km/h)69.22 mph (111.39 km/h)
80 mph (128.75 km/h)73.83 mph (118.82 km/h)
85 mph (136.79 km/h)78.45 mph (126.25 km/h)
90 mph (144.84 km/h)83.06 mph (133.67 km/h)
95 mph (152.89 km/h)87.67 mph (141.1 km/h)
100 mph (160.93 km/h)92.29 mph (148.53 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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