BUCKLOS MTB Single Speed Square Taper Crankset - Lightweight Upgrade

In this review of the BUCKLOS MTB single speed square taper crankset, the bottom line is simple: it is a lightweight, no-nonsense crankset best suited for riders converting to or maintaining a single speed setup. The crankset's main draw is the low weight and durable construction that trims grams compared with multi-chainring systems while still fitting common drivetrains like Shimano and SRAM. Installation is straightforward for anyone comfortable with basic tools, and the variety of chainring sizes and shapes makes it flexible for commuter, e-bike, and mountain bike use.

Key Features

• Lightweight construction: The 104 BCD crankset weighs about 609g, reducing overall bike weight and improving pedaling feel on single speed builds.
• Chainring options: Available in 32/34/36/38/40/42T and in round or oval versions, so riders can choose gearing tuned to their terrain and cadence preference.
• Narrow-wide tooth profile: The chainring uses narrow and wide teeth to help retain the chain more securely on rough trails or bumpy commutes.
• Compatibility: Chainrings are compatible with Shimano, SRAM and FSA systems, giving flexibility when pairing with common drivetrain components.
• Durability: The crankset is described as built to last, intended for mountain bikes, commuter bikes and electric bikes that need a robust single speed solution.
• Easy installation: The square taper interface and included chainring bolts make installation simple for anyone who can use a hex wrench.

Who It's For

This crankset is aimed at riders who want a clean, single speed drivetrain on a mountain bike, commuter or e-bike and value a lightweight, durable component. It suits riders upgrading a heavy multi-gear setup to a simpler single speed, people restoring older square taper bottom brackets, and builders who want the option of round or oval rings to tune pedal feel.

It is not for riders who need multi-speed shifting or who require integrated modern crank spindle standards. If you need a 2x or 3x drivetrain or a hollowtech/ISIS spindle interface, look elsewhere; this product is specifically for single speed square taper installations.

Pros & Cons

Pros

• Lightweight at about 609g, helping reduce rotating mass compared with 3x setups.
• Multiple chainring sizes and round or oval shapes offer useful gearing choices.
• Narrow-wide teeth and 4mm chainring thickness improve chain retention and durability.
• Simple square taper design makes installation accessible and reliable.

Cons

• Only compatible with single speed setups, so it is not suitable for riders who need multi-gear drivetrains.
• Requires a square taper bottom bracket, so modern spindle standards will need adapter or replacement.

Specifications

Crank interface	Square taper
Crankset weight	About 609g
Chainring sizes	32/34/36/38/40/42T
Chainring types	Round or oval, narrow-wide teeth
Chainring thickness	4mm total (narrow 1.9mm, wide 3.7mm)
Compatibility	Fits Shimano, SRAM, FSA; single speed only
Package contents	1 PC crankset, 1 PC chainring, 4 PC chainring bolts

Our Verdict

The BUCKLOS MTB single speed square taper crankset is a practical, good-value upgrade for riders converting to or maintaining a single speed bike. Its lightweight construction, multiple chainring choices and narrow-wide profile deliver reliable function and improved chain retention, while the square taper interface keeps installation simple. For cyclists who want a durable, straightforward crankset without modern spindle complications, this is a sensible choice.

Frequently Asked Questions

Is this crankset compatible with my multi-speed derailleur?
Answer. No, it is designed only for single speed use and is not compatible with multi-speed derailleur setups.

Can I choose oval or round chainrings?
Answer. Yes, the product offers both round and oval chainring options in the listed sizes.

Will the chainring fit Shimano and SRAM chains?
Answer. Yes, the chainring is compatible with Shimano, SRAM and FSA systems as a single speed ring.