The Prevelo Alpha Four is a 24-inch kids' bike and the step up from the 20-inch Alpha Three, crafted for confident riders ages 7 to 11. At 19.2 pounds it blends trail-ready capability with youth-friendly ergonomics: an 8-speed Microshift Acolyte geared drivetrain with chain retention and hydraulic disc brakes. A Two Wheeling Tots Top Pick, it's equally at home on pavement, bike paths, and light singletrack. Fits inseams 23 to 28 inches.