Introducing the Trek Marlin 4 Gen 2 2025, a versatile and reliable mountain bike perfect for riders of all levels. Available with a 29" wheel for medium to large sizes and a smaller 27.5" wheel for small sizes, this bike is designed for optimal performance on all types of terrain. This entry-level bike features a lightweight aluminum frame that provides a smooth and comfortable ride, making it perfect for both beginner riders and seasoned pros.