10 Best Cheap Mountain Bikes 2025 in the United States

The Mongoose Flatrock 21-Speed Hardtail Mountain Bike is designed for a broad range of users, including boys, girls, men, and women, and it is suitable for riders between 4'8" to 5'6" tall. Its lightweight 14.5-inch aluminum frame offers durability without adding unnecessary weight, making it easier to handle and ride. The 24-inch wheels are smaller than standard for adult bikes, which may be better suited for younger riders or shorter adults.

The front suspension fork does a good job of smoothing out bumps and improving control on rough terrain, enhancing the riding experience. With 21-speed twist shifters and a rear derailleur, gear changes are smooth and efficient, whether you're climbing hills or picking up speed on flat ground. The front and rear alloy v-brakes provide reliable stopping power, which is essential for safety on various terrains. Additionally, the double wall alloy rims add to the bike's durability while remaining lightweight.

One downside is that assembly is required, which could be a challenge for some users. The bike is best suited for beginners and casual riders rather than advanced mountain bikers. It's also worth noting the maximum weight recommendation is 120 kilograms, so it might not be suitable for heavier riders. Its combination of features makes it a solid choice for those looking for an affordable and reliable mountain bike for casual use or beginners venturing into mountain biking.