A 24-inch Cannondale bike is generally suitable for riders between 4' and 4'9" (122cm - 145cm). Specifically, the Cannondale Quick 24 and Trail 24 models are designed for this height range. The Cannondale Trail 24 features a lightweight aluminum frame and a suspension fork, making it suitable for both on-road and off-road adventures. The Cannondale Quick 24 is designed for paved surfaces and features lightweight components and 7-speed gearing.