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: Compatible with rear hub barrel shafts converting from 142mm to 148mm, ensuring proper alignment of disc brake rotor position and drivetrain clearance. Resolves compatibility issues between hub, rear wheel, and frame. Suitable for use with quick release systems to install and secure wheels. Made from high-quality aluminum alloy, offering high strength, rust resistance, and durability. Designed to ensure correct disc brake and drivetrain alignment, improving compatibility between hub and frame. Disc brake adapter provides stable performance and high reliability. Precision craftsmanship with a sleek, modern appearance. Includes necessary installation components for easy setup and convenient use. A practical accessory for bicycle enthusiasts performing bike upgrades or customization. Package Includes: 1 x Boost Hub Adapter 1 x Pair of Spacer 6 x Screw Note: Please allow 1-2mm variation due to manual measurement. Monitor settings may affect color representation; actual product color may vary slightly. Please refer to the physical item for accurate color.