Before cartridge bottom brackets there were cup & cone. Most vintage bikes have this style of bottom bracket (BB). The bearings that keep your crank spinning nicely are exposed to debris from an open seat post and left over debris inside the frame tubes. A plastic sleeve can go a long way to maintaining the smoothness of your BB over time and increase the time between cleaning and repacking your bearings. If you are going through the process of cleaning and restoring a bike and its BB, it well worth the $6 CDN investment.
- Fits conventional 68mm BB
- Plastic (Black)
- 52mm wide (seats itself within cups)