1.:Made of high quality materials such as hardened steel or lightweight aluminum, these chainrings for bikes are wearresistant and provide reliable performance on long rides. 2.Precise Tooth Design The optimized tooth profile reduces chain slip and improves shifting precision. This makes these chainrings suitable for both recreational and competitive drivers. 3.EASY ASSEMBLY AND MAINTENANCE The chainrings are designed for hassle installation and come with easytofollow instructions. So you can get started quickly. 4.IMPROVED RIDING EXPERIENCE Increase the efficiency and speed of your bike with these high performance chainrings and ensure a quieter and more enjoyable ride every time. 5.Compatible with various types of bicycles: whether road bike, mountain bike or trekking bike, our chainrings are designed for various cranksets and a variety of uses. 6.Floating pulley and spring adjustment can achieve perfect chain tension. 7.Adopts the bearing shaft and can be adjusted with a variety of guide wheels. The guide wheels generally use 11 teeth or 13 teeth. 8.Can effectively prevent the chain from falling and reduce the gait. Suitable for people who like cycling. 9.This bicycle chain tensioner is made of highquality aluminium alloy, durable, lightweight and easy to install.