- The square bottom bracket is made of high-strength steel. It is strong, durable, and offers excellent compatibility and load-bearing capacity. - The integrated bottom bracket system design ensures smooth, stable, and quiet rotation. - The sealed cartridge bearing is maintenance-free and protects against dirt, mud, and water. - The steel cover on the bottom bracket accommodates the roundness tolerance when mounting the lower attachment points of the bracket. Applications: - Upgrading an off-road or mountain bike that faces dirt and mud, to achieve reliable, quiet pedaling with reduced maintenance. - Replacing a worn bottom bracket on a city or commuter bike to improve smoothness and longevity. - Building or restoring bikes that use square-taper cranks and require a durable, high-load-capacity, low-maintenance bottom bracket.