Disc brake adapter bracket for bicycles — stainless steel adaptor frame that converts standard rimbrake frames to accept disc brake calipers on either the front or rear wheel mounting positions, providing improved stopping power and control. Key benefits Converts existing bicycles to disc brake compatible models without modifying the frame, letting you upgrade braking performance on older or rimbrakeonly bikes. Improves stopping power and modulation, especially useful in wet or steep riding conditions and when carrying heavier loads. Durable stainless steel construction resists corrosion and wear from moisture and road elements for reliable, longterm use. Compatibility and fit Includes two innerdiameter rings (22 mm and 32 mm) to cover a broad range of frame mounting geometries and to help achieve correct calipertorotor alignment during installation. Precise fit: 51 mm hole spacing and 4 mm bracket thickness for secure attachment with minimal play. Designed to install on either front or rear mounting positions using common hand tools — no welding or frame modification required. Material and performance Stainless steel adaptor frame maintains structural integrity under repeated use and allweather exposure. 4 mm thickness provides the rigidity needed to hold the caliper steady for consistent braking performance and to minimize flex that can cause noise or uneven pad wear. What this solves Lets riders add disc brakes to bikes that originally only supported rim brakes, improving safety and control. Reduces brake fade and inconsistent braking in wet or muddy conditions. Enables safer stops for heavier riders, cargo bikes, or bikes used for commuting and touring. Included items and installation notes Adapter frame plus two adapter rings (22 mm and 32 mm inner diameters) to match common mount sizes. Mounting uses existing wheel mounting positions; align the caliper with the rotor carefully during installation to ensure smooth operation. Installation is straightforward with standard tools; check caliper alignment and rotor clearance after mounting. Use scenarios Upgrade a vintage road or commuter bike to disc brakes for safer wetweather commuting. Fit disc brakes to a cargo or touring bike to handle heavier loads and extended descents with more consistent stopping power. Improve braking control on a child's or entrylevel mountain bike without replacing the frame. Technical specifications Material: stainless steel Adapter ring inner diameters: 22 mm and 32 mm (included) Hole spacing: 51 mm Thickness: 4 mm Fits front or rear wheel mounting positions Reliable, corrosionresistant, and engineered for a secure fit, this adapter bracket provides a practical way to add disc braking capability while preserving the original bicycle frame.