Sonoma Men's Chainless Drive Evolution Oasis Beach Cruiser Bike Chainless men's beach cruiser with lightweight aluminum frame and unicrown fork D-Drive system eliminates chain and derailleur for low-maintenance, comfortable riding Chainless system is quieter, smoother, and lasts longer than traditional chain-driven systems Dual spring comfort saddle and bullhorn-style handlebars; 3-speed shifting system Premium alloy V-brakes plus coaster brake; lifetime warranty on frame, fork, and D-Drive system