Press fit bottom brackets are here to stay. Here's how to remove and replace BB86 and BB30 bottom brackets on your road bike. Here's our guide to removing and replacing your press fit bottom bracket. Bottom brackets like the BB86 and BB30 are increasingly common on high-end carbon fiber road bikes – especially those made after 2010. While press-fit bottom brackets may need a few more tools to work on, they are not too difficult. With the right tools, you'll be able to replace your bottom bracket