BUCKLOS MTB Mountain Bike Single Speed Square Taper Crankset - Durable

Our review finds the BUCKLOS MTB single speed square taper crankset is a sensible, value-oriented option for riders converting to or maintaining a single speed or 1x drivetrain. It is best for commuters, ebike owners upgrading a simple drivetrain, or anyone who values a lightweight, straightforward crankset that is easy to install. The single biggest reason to buy is the combination of low weight and compatibility with common chainring sizes, offering a clean, single-speed setup without the complexity or cost of a multi-speed crank.

Key Features

• Lightweight construction: The 104 BCD crankset weighs about 609g, making it easier to pedal and accelerating responsiveness compared with heavier alternatives.
• Multiple chainring options: Choose from 32/34/36/38/40/42T in round or oval shapes to match single-speed gearing needs and rider preference.
• Narrow-wide chainring design: The 4mm thick chainring with narrow and wide tooth profiles improves chain retention for one-by drivetrains when setup correctly.
• Broad compatibility: The chainring works with common crank and drivetrain brands such as Shimano, SRAM and FSA for straightforward fitment.
• Simple square taper fit: The traditional square taper spindle interface makes installation easy with basic tools and reduces compatibility concerns on older bikes.

Who It's For

This crankset is aimed at riders who want a lightweight, no-frills single speed or 1x conversion for mountain bikes, commuter bikes or electric bikes. It suits people who value easy installation and a range of chainring sizes so they can tune gear ratio and chainline for urban riding or trail use.

Riders who rely on heavy-duty, high-torque use or expect perfect chain retention in very rough offroad conditions may want to look for more robust, purpose-built cranksets or a full chain guide system. Also note this is single speed only, so multi-speed riders should choose a compatible multi-speed crank.

Pros & Cons

Pros

• Light and durable build that reduces rotating mass and feels responsive when pedaling.
• Multiple chainring sizes and round or oval options let riders pick an ideal gear ratio.
• Easy to install square taper interface keeps fitment simple for home mechanics.
• Includes chainring bolts so you have what is needed to mount the chainring.

Cons

• Being single speed only, it is not suitable for bikes that require multi-speed drivetrains.
• Some riders report occasional chain drop or concerns about chain strength in heavy use, so a chain guide or attention to setup may be needed.

Specifications

Crank type	Square taper single speed crankset
Crank arm length	170mm
BCD	104 BCD
Chainring options	32/34/36/38/40/42T round or oval
Chainring thickness	4mm (narrow 1.9mm, wide 3.7mm)
Weight	Crankset about 609g; chainring about 45g
Package contents	1 crankset, 1 single speed chainring, 4 chainring bolts

Our Verdict

The BUCKLOS single speed square taper crankset is a practical, cost-effective choice for commuters, ebike riders and anyone converting to a simple 1x drivetrain. It offers good weight savings, a selection of chainring sizes and straightforward installation. Those needing heavy-duty offroad robustness or multi-speed capability should consider other options, but for single-speed use this is solid value.

Frequently Asked Questions

Is this crankset compatible with multi-speed drivetrains?
No, this product is designed for single speed use only and is not compatible with multi-speed chainrings.

Will the narrow-wide chainring stop the chain from falling off?
The narrow-wide profile improves retention, but some users report occasional chain drop; proper chainline and a chain guide help reduce that risk.

What tools are required for installation?
Installation is straightforward with basic hand tools; a hex wrench set is sufficient for mounting on a square taper spindle.