A greater percentage of Madisonians bike to work — 6 percent — than in any of the largest U.S. cities except Portland, Ore., which has the same percentage, according to the State Smart Transportation Initiative. Next on the list released Monday by the UW-Madison-housed initiative was Seattle, which had 3.6 percent of its commuters using a bicycle to go to work in 2010, followed by San Francisco and Minneapolis, which both had 3.5 percent.