Truly the Maybach of bottom brackets! Kink's Ti-Ceramic mid bottom bracket features machined dust cover cones and precision sealed bearings with titanium nitride coated races and ceramic ball bearings. Good luck finding a smoother, lighter (4.5oz) and more durable bottom bracket than this! The center tube spacer is a standard 51mm, and if for some reason your frame requires a 48mm spacer, a cut guide has been machined into it so you can easily trim it down. Includes all the necessary spacers to dial in your crank and chain alignment.