YOU NEED:
1. ejector - the ejector is a special expanding cone. Bearings can be driven out using the appropriate hammer. These special tools are not cheap (e.g. Cyclus universal bearing extractor, www.ra-co.de), in an emergency you can also use a conventional hammer and a suitable chisel.
2. threaded spindle - if you do not want to buy a threaded spindle (e.g. Cyclus press-in tool for bearings), you can also help yourself with a conventional threaded rod, two nuts and washers.
3. fat
4. allen key
...
THE RIGHT FAT
Not every grease is suitable for use on carbon frames; some manufacturers even prohibit the greasing of contact surfaces with carbon. This is because greases can cause the carbon to swell or delaminate and damage the bearing seat. However, some manufacturers, e.g. Tunap Sports, approve their grease for carbon frames. Be careful when pressing in the bearings: never use assembly paste. Assembly paste increases friction and is suitable for slipping carbon seat posts, for example.
STOCK
How do I find the right bearings for my bike? Manufacturers often offer a suitable bearing kit with all spare parts for the respective frame. If this is not the case, each industrial bearing has a number (on the rubber seal) which can be used to reorder the industrial bearing from a metal shop or online. If the number is no longer legible, the only thing that can help is to measure the width, outer and inner diameter. When purchasing, look out for the abbreviation 2RS for a double rubber seal.
LOVE IN THE SHOP
Changing bearings on the rear triangle is no easy task. In the rarest of cases, all bearings slip out of the frame without any problems. If you don't feel like spending your weekend in your own hobby workshop or are not entirely sure about pressing in bearings, it is often better to go to a specialist dealer. The professionals in the bike shop have experience, the right tools and usually also the spare parts in stock. The service usually costs between 100 and 200 euros.
