How to Fit Press Fit Bottom Bracket
In recent years, press fit bottom brackets have become increasingly popular in the cycling world due to their ease of installation, weight savings, and improved stiffness. This article will guide you through the process of fitting a press fit bottom bracket to your bicycle, ensuring a secure and efficient setup.
Understanding Press Fit Bottom Brackets
Press fit bottom brackets are designed to be pressed into the frame rather than threaded into the bottom bracket shell. This allows for a lighter and stiffer bottom bracket, which can improve overall bike performance. There are two main types of press fit bottom brackets: PF30 and BB86/92.
The PF30 bottom bracket is the most common type and fits into a 30mm diameter shell. The BB86/92 bottom brackets, on the other hand, are designed for frames with a 86.5mm or 92mm diameter shell, respectively.
Tools and Materials Needed
Before fitting a press fit bottom bracket, gather the following tools and materials:
– Press fit bottom bracket (PF30 or BB86/92)
– Bottom bracket tool
– Press (manual or hydraulic)
– Grease
– Wrench or spanner
– Cleaning cloth
Preparation
1. Clean the bottom bracket shell and the inside of the frame to remove any dirt or debris.
2. Apply a small amount of grease to the inside of the bottom bracket shell to facilitate the installation process.
Installation Process
1. Place the bottom bracket shell in the frame, ensuring that it is properly aligned with the frame’s bottom bracket shell.
2. Position the bottom bracket cup on the spindle of the press fit bottom bracket. The cup should fit snugly onto the spindle.
3. Insert the bottom bracket tool into the press and attach it to the press’s spindle.
4. Place the press’s die over the bottom bracket tool and ensure that it is securely in place.
5. With the bottom bracket in position, slowly press the bottom bracket into the frame. Be sure to apply even pressure around the circumference of the bottom bracket to ensure a proper fit.
6. Once the bottom bracket is fully seated, remove the press and inspect the fit. The bottom bracket should be flush with the frame and not rocking or loose.
7. Apply additional grease to the threads of the bottom bracket cup and insert the bottom bracket spindle and cups into the frame.
8. Tighten the cups securely using the wrench or spanner, ensuring that they are tight but not over-torqued.
Conclusion
Fitting a press fit bottom bracket to your bicycle can be a straightforward process with the right tools and a bit of patience. By following these steps, you can enjoy the benefits of a lighter and stiffer bottom bracket, leading to improved overall bike performance. Always refer to the manufacturer’s instructions and use the appropriate tools to ensure a successful installation.
