Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/60r17 vs 225/50r17 Tire Comparison Side By Side
  255/60-17 225/50-17 Difference
Diameter inches (mm) 29.05 (737.8) 25.86 (656.8) -3.19 (-81) -11%
Width inches (mm) 10.04 (255) 8.86 (225) -1.18 (-30) -11.8%
Circum. inches (mm) 91.25 (2317.87) 81.24 (2063.4) -10.02 (-254.47) -11%
Sidewall Height inches (mm) 6.02 (153) 4.43 (112.5) -1.59 (-40.5) -26.5%
Revolutions per mile (km) 694.32 (431.43) 779.95 (484.64) 85.63 (53.21) 12.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.8 mph (28.65 km/h)
25 mph (40.23 km/h)22.26 mph (35.82 km/h)
30 mph (48.28 km/h)26.71 mph (42.98 km/h)
35 mph (56.33 km/h)31.16 mph (50.14 km/h)
40 mph (64.37 km/h)35.61 mph (57.31 km/h)
45 mph (72.42 km/h)40.06 mph (64.47 km/h)
50 mph (80.47 km/h)44.51 mph (71.63 km/h)
55 mph (88.51 km/h)48.96 mph (78.8 km/h)
60 mph (96.56 km/h)53.41 mph (85.96 km/h)
65 mph (104.61 km/h)57.86 mph (93.12 km/h)
70 mph (112.65 km/h)62.31 mph (100.29 km/h)
75 mph (120.7 km/h)66.77 mph (107.45 km/h)
80 mph (128.75 km/h)71.22 mph (114.61 km/h)
85 mph (136.79 km/h)75.67 mph (121.78 km/h)
90 mph (144.84 km/h)80.12 mph (128.94 km/h)
95 mph (152.89 km/h)84.57 mph (136.1 km/h)
100 mph (160.93 km/h)89.02 mph (143.27 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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