By Carrie Melago

The number of city bike riders jumped by 35% in a year — making some wonder if New York is big enough for 8 million people, a couple of million cars and about 185,000 cyclists.

Avid cyclists see themselves as the healthy, green, cheap future of transportation.

City officials agree, completing 200 miles of bike lanes in three years, adding bike racks and shelters and pushing employers to provide bike parking.

But with the number of cyclists exploding — increasing 35% between 2007 and 2008 —many pedestrians and motorists say it's getting awfully crowded out there.

"When I, as a retired woman, walk these streets, I have fear of my safety that I will be hit by these riders and get knocked down," said Marjorie Levine, 62, who has been pushing for more regulations.

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