Nirve Fifty-Three Men's Cruiser Bike (26-Inch Wheels) Men's 3-speed cruiser bike with proprietary 18-inch carbon-steel Galaxie frame Shimano automatic shifting technology instinctively changes gear when terrain changes Smooth-rolling 26-inch aluminum wheels with Nirve vintage-tread tires Classic double-spring saddle and cruiser-style handlebars with ComfortSoft grips Quick-adjust seat clamp; welded cartridge kickstand; 5-year warranty on frame