The Bombshell Spinnergy Bottom Bracket is the result of years of research into making a better BB, and after careful work with bearing supplier; we feel that we have created the ultimate OB compatible BB. It uses big honkin’ 12mm wide (10mm is standard) bearings to better reduce ball load and add considerable bending stiffness to the spindle. These ultra-precision bearings were designed in Germany to the highest standards and use the custom formulated waterproof grease to ensure that the bottom bracket will roll smoothly for 10.000 miles. Comes with 2 regular and one compresion spacers. 68 & 73 mm bottom bracket shell compatible.