a person who rides a bicycle, motorcycle, or motorbike, especially in competition or as a hobby.
Informal. a member of a motorcycle gang.

1880–85; bike1 + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
biker (ˈbaɪkə)
informal a member of a motorcyle gang

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"motorcycle rider" (especially with reference to club affiliation), 1968, Amer.Eng., from bike in its slang sense of "motorcycle" (1939).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We need to design for the pedestrian and biker in conjunction with car travel
  and rapid transit.
Even biker gangs tend to turn into shy little smiling puppies when an outsider
  approaches them.
Biker bars, hidden gems across the country that cater to bikers, are havens
  after a long ride.
The trails skirt the sandstone cliffs and offer something for every level of
  mountain biker.
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