Wheels on Wheels. In addition to a MetroCard, many New Yorkers now carry an MTA MetroBike ($299), a lightweight folding bicycle that was designed by the Citizen Bike company to be brought aboard any subway or bus. It features a six-speed gear system and twenty-inch wheels. Other city-specific models include the Barcelona ($394), the Miami ($194) and the Tokyo ($164). citizenbike.com.
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