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New product -45%Square taper bottom bracket Shimano Altus 116 mm- €6.04
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MTB square taper bottom bracket: features and specifications
In the world of bicycle drivetrains, the MTB square taper bottom bracket remains a reliable solution valued by many riders. While newer standards such as Hollowtech II or Press-Fit have become dominant on modern bikes, the square taper system still offers undeniable advantages for mountain bikers looking for durability and simplicity.
What is a square taper MTB bottom bracket ?
The bottom bracket is a key component of the bike drivetrain: it connects the crankset to the frame, allowing the cranks to rotate smoothly and transfer power to the chain and cassette.
The square taper model is characterized by its square-shaped, tapered spindle. The crank arms are fitted onto this spindle and firmly secured with bolts.
Main features of a square taper bottom bracket
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Wide compatibility: it fits a large number of cranksets and threaded frames, especially on entry-level and mid-range MTBs.
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Durability: its simple design, usually with sealed bearings, ensures resistance to wear, dirt, mud, and water.
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Easy installation: removing or fitting a square taper bottom bracket requires only standard tools, making it convenient for bike mechanics and DIY enthusiasts.
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Different spindle lengths: available in several sizes (e.g., 107 mm, 113 mm, 122 mm), allowing adjustment of the Q-factor and chainline depending on the crankset used.
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Reasonable weight: while slightly heavier than some modern external bearing systems, it remains light enough for versatile MTB use.
Technical specifications to know
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Threading: most square taper MTB bottom brackets use the BSA (English) thread standard, which is widely available and compatible with many frames.
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Sealed cartridge bearings: they reduce maintenance needs and extend the life of the bottom bracket.
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Compatibility with double or triple cranksets: still common on many mountain bikes, especially for leisure or touring use.
Why choose a square taper MTB bottom bracket ?
The main advantage of this system is its excellent value for money. Easy to find, affordable, and robust, it’s the perfect option for maintaining an older MTB or equipping a bike used for regular, non-competitive riding.
Its mechanical simplicity also makes it appealing to cyclists who prefer servicing their own drivetrain. Unlike some modern standards, a square taper bottom bracket does not require special tools and can be quickly replaced if looseness or creaking occurs.
In short, the MTB square taper bottom bracket is a timeless component of the bike drivetrain. Accessible, reliable, and easy to maintain, it remains a smart choice to extend the lifespan of a mountain bike while ensuring smooth crank rotation.