Sonoma Men's Chainless Drive Evolution Urban Commuter Bicycle Chainless men's bicycle with lightweight aluminum frame and T-shock suspension 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 Cushioned satin saddle ideal for long rides; front and rear alloy V-brakes High-density dual rubber handgrips; lifetime warranty on frame, fork, and D-Drive system