High-strength aluminum alloy construction The threaded hub of the bicycle flywheel and adapter are made from quality aluminum alloy for durable performance. Built to withstand strong braking forces so the braking system remains reliable under heavy use. Precision fit for smooth, efficient operation Precision-engineered components ensure a seamless, comfortable fit with your freewheel and rotor. A correct fit reduces wobble, improves braking consistency, and extends component life. Clear compatibility and exact dimensions Hole spacing: 44 mm Inner diameter: 34 mm Height: 7.6 mm Measure your bike components before purchase to confirm these dimensions match your hub and rotor for a snug installation. Improved braking stability and safety Designed as a brake disc adapter, this component helps your bike brake quickly and stably, providing predictable stopping power for safer rides. Easy replacement and maintenance Use this adapter to replace worn or damaged parts when servicing the freewheel or disc rotor; it restores correct alignment and braking performance without complex modifications. Typical applications Daily commuting: restores firm braking on city bikes subject to frequent stops, improving rider confidence and control in traffic. Trail and mountain riding: withstands repeated heavy braking on descents, helping maintain stable stopping power on rough terrain. Component upgrade or repair: ideal when replacing a worn freewheel adapter or installing a compatible rotor to ensure proper fit and function. Why choose this adapter Durable material for lasting performance under load Exact dimensions for predictable compatibility Precision fit to reduce play and improve braking response Note: Confirm hole spacing (44 mm), inner diameter (34 mm), and height (7.6 mm) on your bike before ordering to ensure proper fit.