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BMX Bottom Brackets

Crank Axle Diameter
Bottom Bracket

BMX Bottom Brackets Are the Core of Your BMX

On a BMX bike, you will find the bottom bracket installed in the frame where the crank arms meet each other. This part of the bike frame is called the bottom bracket shell. The main components are 2 bearings and spacers, and their purpose is to allow the rider to spin the pedals freely to get speed. The parts are extra strong and sturdy as they need to withstand a lot of pressure that is created by aggressive pedaling.

The Different Types of BMX Bottom Brackets

The four main types are - American bottom bracket, mid bottom bracket, Spanish bottom bracket and euro bottom bracket. They all have different sizes of bearing cases, so you need to choose the one that fits your bike frame shell.

American bottom brackets are the oldest type and have the largest diameter. They come with sealed bearings or open bearings that sit in cups. Mid bottom brackets are found on most BMX bikes these days, as they are simple to install and sit plushly in the frame. Spanish bottom brackets are small and lightweight, giving them a clean look. They are also pressed into the frame rather than threaded. Euro bottom brackets are commonly found on race BMX bikes. They are threaded into the frame with the bearings sitting in cups.

What Size Bottom Bracket Do I Need BMX?

The BMX bottom bracket sizes are 19 mm, 22 mm, 24 mm. This measurement is the diameter of the bearing hole, therefore it needs to match the spindle size from your crankset. The 19 mm bottom bracket is most common, and nearly all brands have models of this size. The 22 mm and 24 mm are thicker and stronger than the 19 mm and, in most cases, have no additional weight.

If you are also looking for a crankset to go with your new bottom bracket, then check out BMX Cranksets.

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