Material: This bike disc brake adapter made of aluminium alloy material, high strength, solid and durable.Refitting bracket can refit normal bicycle to update into triangle frame disc brake bicycle.Easy to install: Simple structure, easy to install and convenient to useWhen the frame does not have a disc brake seat, the disc brake can be installed after installing this accessory.A necessity for cyclists, useful and practical to use, which can be converted into ordinary bicycle disc brakes bike.Specification:Material: Aluminum AlloySize: 122x80x15mm/4.80x3.15x0.59 inchPackage Includes:2 Pieces Bike Disc Brake AdapterNote:The rear triangle of the frame is a normal triangle shape, not too special.The wheel must be a quick release structure.Non-universal product, please carefully confirm whether it can be used before purchase.