Engineered headset bearings for mountain bike headset that restore smooth steering, reliable performance, and long service life. Key features Purposebuilt for general headset on mountain bikes. Engineered steel bearings help eliminate rough steering and reduce play in the head tube. Sizes included: 41mm, 41.8mm, 47mm, 49mm, 51mm, 52mm (listed as 41mm*41.8mm*47mm*49mm*51mm*52mm). Compatibility: fits wrist group systems sized 28.6*44*30mm and serves as an upgrade or direct replacement for older headset models. Material: made from grade upper bearing steel for improved wear resistance and corrosion protection under varied riding conditions. Quantity: 1 x headset bearing included. Why you need this bearing Fixes common headset issues: replaces worn or pitted bearings that cause noise, vibration, looseness, and imprecise steering. Restores steering precision and control so you can ride confidently on rough trails and at higher speeds. Durable construction extends service intervals and reduces the need for frequent replacements. What makes it stand out Specifically tailored for mountain bike headset demands: withstands side loads, impacts, and wet or dirty trail conditions. Precise sizing options cover common headset standards, allowing a secure fit and smooth rotation. Designed to older sealed headsets; not intended for use with loose ball systems. Practical use scenarios a noisy or loose headset bearing after a season of trail riding to restore stable handling. Upgrade an aging headset during a fork or headset service to improve rotational efficiency and steering feel. Keep a spare bearing onhand for ontrail repairs or preride maintenance when you expect demanding terrain or longdistance rides. Compatibility note Compatible with 28.6*44*30mm wrist group systems; not compatible with loose ball headset systems.