Description: 1.A good replacement for the old or damaged front adapter. 2.Easy installation Suitable for most mountain bike, road bike, etc. 3.Material: aluminum alloy The conversion shoe is light and durable. 4.Small size, easy installation. Great ability to withstand high and low temperatures. 5.The 28.6 MM diameter frame can be converted into a 31.8MM frame, so you can install a 31.8MM diameter of front dial ring.