Welcome to our store！</br> 1、Suitable for the rear hub barrel shaft to open 142mm to 148mm, and the quick release device is used to install and fix the wheels. 2、Made of high quality aluminium alloy material, which is high strength, anti‑rust, non‑deformation and durable. 3、To adapt to the corresponding disc brake disc position and the demand of opening gear, solved the problem of compatibility between hub and rear wheel and frame. 4、The disc brake adapter has stable performance,high reliability. Exquisite workmanship, stylish and generous appearance. 5、Comes with necessary accessories, easy to install and convenient to use. Useful accessory for bike lovers to DIY bike <p class="wang-edit-text">Item Type: Boost Hub Adapter Material: Aluminum Alloy Color: Black Specification: Rear 12MM hub barrel shaft to open 142mm to 148mm Hub Adapter Thickness: Approx.3mm / 0.12in Spacer Thickness: Approx.3mm / 0.12in Outer Diameter: Approx.5.2cm / 2.0in Inner Diameter: Approx.4cm / 1.6in Application: Suitable for the rear hub barrel shaft to open 142mm to 148mm, in order to adapt to the corresponding disc brake disc position and the demand of opening gear, solved the problem of compatibility between hub and rear wheel and frame. <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 1 x Boost Hub Adapter 1 x Pair of Spacer 6 x Screw Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>