BUCKLOS MTB 170mm Square Taper Crankset with Narrow Wide Chainring

In this review the BUCKLOS MTB 170mm square taper crankset is judged as a practical, budget-friendly upgrade for riders who need a lightweight, single-speed crank option that fits common drivetrains. The single biggest reason to consider it is the combination of an ultralight 609g crank body with a narrow-wide single speed chainring option, which together deliver a durable, simple drivetrain solution for mountain, commuter, or e-bike conversions. This review focuses on compatibility, build quality, and real-world usefulness.

Key Features

• Lightweight construction: The crankset weighs about 609g, making it easier to accelerate and climb compared with heavier stock cranksets.
• Multiple chainring sizes: Available in 32/34/36/38/40/42T sizes so riders can tune gearing for trails, commuting, or touring.
• Narrow-wide tooth profile: The 4mm thick chainring (narrow 1.9mm, wide 3.7mm) helps retain the chain and reduces drops on rough terrain.
• Single speed design: Purpose-built for single-speed setups, simplifying maintenance and lowering the chance of shifting issues.
• Wide compatibility: The chainring and crank are stated to fit Shimano, SRAM, and FSA systems and use a 104 BCD pattern for easy swapping.
• Complete package: The box includes one crankset, one single-speed chainring and four chainring bolts, so installation is straightforward for most users.

Who It's For

The BUCKLOS crankset suits cyclists who ride single-speed mountain bikes, commuters converting to a single ring, or e-bike owners wanting a simple, lightweight crank option. It is especially useful for riders who prefer minimal drivetrain maintenance and those who value narrow-wide teeth for chain security while riding off-road.

Riders who need multi-speed compatibility, integrated crankset features, or a different bottom bracket standard should look elsewhere. Note this crankset requires a square tapered bottom bracket and is only offered in a 170mm crank arm length, so check fitment before purchase.

Pros & Cons

Pros

• Very light crank body at about 609g, which helps reduce rotating mass.
• Choice of chainring sizes and round or oval options lets riders tailor gearing to their needs.
• Narrow-wide chainring profile improves chain retention for single-speed use.
• Includes chainring bolts and a chainring, so it arrives ready to install.

Cons

• Only compatible with single-speed setups and requires a square tapered bottom bracket, limiting use on multi-speed bikes.
• Crank arm length is fixed at 170mm, which may not suit every rider preference.

Specifications

Crank arm length	170mm
Crankset weight	About 609g
Chainring sizes	32 / 34 / 36 / 38 / 40 / 42T
Chainring thickness	4mm total (narrow 1.9mm / wide 3.7mm)
BCD	104 BCD
Compatibility	Fits Shimano, SRAM, FSA; square taper BB required
Included	1 crankset, 1 single-speed chainring, 4 chainring bolts

Our Verdict

The BUCKLOS 170mm square taper crankset is a smart, value-conscious choice for riders who want a lightweight single-speed setup with reliable chain retention. It is best for mountain, commuter, and e-bike applications where simplicity and weight savings matter, though its single-speed limitation and fixed arm length mean it is not the right fit for every rider. For the price and included hardware, it represents solid value.

Frequently Asked Questions

Will this fit my bike?
It will fit bikes with a square tapered bottom bracket and is intended for single-speed use; confirm your BB type before buying.

Can I use this with a 9/10/11-speed chain?
The chainring is designed for single-speed setups; multi-speed chains and shifting systems are not supported.

Are oval chainrings available?
Yes, the product offers round and oval chainring options across the listed tooth counts.