The Chris King Bottom Bracket is designed to offer season after season of smooth turning service. To ensure maximum performance we strongly recommend proper reaming & facing to be done to the bottom bracket shell by a qualified bicycle mechanic prior to component installation. For installation of the bottom bracket we offer the Chris King BB External Cup Tool. Our cup tool is anodized aluminum & features a 3/8" socket drive and recommend use with a high-quality torque wrench. The spline interface is precision made to match our bottom bracket cups ensuring a secure fit during installation while preventing finish damage. The Chris King BB Injector Tool is designed specifically for use with Chris King Bottom Brackets only. Available in both 24 & 30mm versions This all-aluminum tool is designed to be used in conjunction with many popular push-type grease gun systems by threading directly onto the gun nozzle. We also provide a zerk fitting allowing for use with a universal fitting grease gun.