A bottom bracket is a metallic component located on the lower central part of a bicycle and joins together both crankarms of a crankset.
It’s a crucial part of the bike, as it’s the one on which the pedal movement depends, and one of the components where wear and tear is more present, as it supports the cyclist’s whole weight, oscillating between the right and left sides of the body.
Before you buy a new bottom bracket, make sure it’s compatible with your bike and pay attention to aspects such as its total length, how it’s assembled or what thread it features, among others.
There are many different kinds of bottom brackets. Here at Santafixie, we sort them by what thread they have. Find out what bottom bracket you need in order that your bike works properly, and buy your bottom bracket online from your own home.
In order to correctly uninstall your current bottom bracket, you will be needing a bottom bracket remover. Without it, you won’t be able to uninstall it, and you will need to bring the bike to a mechanic.
Bottom brackets can be classified in two main categories: either they have a thread, and are further subdivided into other categories; or they don’t have a thread, in which case they are called ahead bottom brackets.
According to what kind of thread is on a bottom bracket, it can fall into two different categories:
Nowadays, threadless or ahead bottom brackets can also be found in the market. They are the kind most commonly used on road bikes, MTB bikes and some gravel or medium-high-end bikes.
Unlike what happens with threaded bottom brackets, threadless ones are directly mounted on one of the crankarms.
It needs to be perfectly adjusted to the bottom bracket shell in order to prevent dust and water to get in, and so that it can function properly.