Bottom Brackets for All Drivetrain Systems
Wide range of bottom brackets at the best prices on the market
If your bottom bracket is worn out and you're looking for a new one, you've come to the right place. Below you'll find our range of bottom brackets at affordable prices. When choosing a bottom bracket, it's important that it fits your bike in terms of both size and thread.
Which bottom bracket should I choose?
The things you need to pay special attention to when buying a new bottom bracket are:
1. Thread: To find out what thread your bike uses, you can check what it says on your current bottom bracket. If it says 1.37x24T it is a BSA thread (Birmingham Small Arms), if it says 36x24T it is an ITA thread.
2. Axle width: The width of the axle that goes through the bottom bracket. Measure the full length of your old bottom bracket axle and buy one with the same length.
In addition, you should also check the installation width of the bike's bottom bracket, which on most everyday and road bikes is 68mm; many mountain bikes with 73mm.
Here's an overview of the different types of bottom brackets and their differences
Square bottom bracket
- An older type of bottom bracket known for its durability and reliability.
- It consists of a square axle that fits into a square hole in the crankset of the bike.
- Installation is relatively simple and requires no specialized knowledge
- This type of bottom bracket is often cheaper than other types and is the most common on everyday bikes.
PowerSpline
- A type of bottom bracket designed by FSA and most common on mountain bikes.
- It consists of an axle with 8 grooves that fits into a crankset that has a similar number of grooves.
- The PowerSpline axle is hollow and has an internal thread for mounting the left crank arm.
- This type of bottom bracket has good durability and is relatively easy to install.
Press-Fit
- A modern type of bottom bracket that has become more popular in recent years.
- It consists of two cups that are pressed into the frame of the bike.
- The crankset fits directly into the bottom bracket, as long as you have chosen the correct type.
- Press-Fit bottom brackets are known for their light weight and rigidity, but require a special tool for installation.
Shimano Octalink
- A type of bottom bracket introduced by Shimano in the mid-90s.
- It consists of an octagonal axle that only fits Octalink cranksets.
- The crank arms are mounted using a bolt that goes through the axle.
- Shimano Octalink bottom brackets are known for their rigidity and efficiency, but can be difficult to find replacement parts for today.
External bearings
- A type of bottom bracket that has become very popular due to its light weight and ease of installation.
- It consists of two bearings that mount directly to the frame of the bike.
- Outer bearings are available in many different sizes and qualities.
- Outside bearings are widely used on sports bikes; racing bikes and mountain bikes.
