Bought this for my son's 3x7 drivetrain hardtail mountain bike. The chain didn't fall off easily, but we started riding a downhill lift park and I wanted an added reassurance that his chain would stay in place. Our first foray into the park before the chain tensioner fell in half. On the next ride with the tensioner, the chain never broke even in the smallest gears, it even cracked and the wheel threw itself on its side against the stones, the chain stayed! We've ridden about 30 miles since installing it and I haven't noticed any noticeable wear on the guide. There are two for the price, which is great! It's also worth noting that it's not made of normally molded plastic, but is 3D printed and appears to be much stronger than regular plastic due to the material's different "grain" or texture.
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