BUCKLOS 70mm -17° Negative MTB Bike Stem | Aluminum Alloy

BUCKLOS 17° Negative Bike Stem – 70mm Aluminum Alloy MTB Handlebar Stem

Upgrade your mountain bike's cockpit with the BUCKLOS Negative Bike Stem. Engineered at a -17 degree angle with a 70mm length, this stem positions your handlebars for a more aggressive, performance-focused riding posture. Built from high-strength aluminum alloy with a hollow design, it delivers an impressive strength-to-weight ratio — weighing in at just approximately 178.9g. Compatible with the majority of mountain bikes, this is a reliable, precision-machined upgrade for serious riders.

Made in Mainland China.

Key Specifications

• Brand: BUCKLOS
• Angle: -17 Degrees (Negative)
• Length: 70mm
• Material: Aluminum Alloy
• Steerer Tube (Fork Clamp) Diameter: 28.6mm
• Handlebar Clamp Diameter: 31.8mm (fits 31.1–32.5mm range)
• Weight: ~178.9g
• Logo Color: White / Black
• Package Includes: 1 × Bicycle Handlebar Stem

Why Choose the BUCKLOS Negative Stem?

• Lightweight Hollow Design: The carefully engineered hollow construction reduces weight without sacrificing structural integrity — perfect for cross-country and trail riding.
• Wide Compatibility: The 28.6mm fork clamp and 31.8mm handlebar clamp diameter cover the vast majority of modern MTB setups.
• High-Strength Aluminum Alloy: CNC-machined for a precise fit and a clean, durable finish that stands up to trail conditions.
• Aggressive -17° Angle: Lowers the front end of your bike for improved aerodynamics and a more engaged riding position on descents and technical terrain.
• Easy Installation: Straightforward bolt-on installation compatible with most standard mountain bike forks and handlebars.

What's in the Box?

• 1 × BUCKLOS Negative Bicycle Handlebar Stem (70mm, -17°)

Note: Product images may vary slightly in colour due to photographic lighting and monitor settings. Minor dimensional variances of ±1–2mm may occur due to manual measurement methods.

Complete Your Bike Build

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• 2m Folding Telescoping Tripod – Great for Outdoor Adventures
• Sheath Belt Loop Pouch – Carry Storage for Outdoor & Trail Use

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Frequently Asked Questions

Q: What handlebar diameter is the BUCKLOS 70mm negative stem compatible with?

A: The BUCKLOS negative bike stem is designed to fit handlebars with a clamp diameter of 31.8mm (compatible with 31.1–32.5mm range), which is the standard size for most modern mountain bike handlebars.

Q: What fork steerer tube size does this MTB stem fit?

A: This stem is designed for a 28.6mm steerer tube diameter, which is the standard 1-1/8" threaded or threadless fork size found on the majority of mountain bikes.

Q: What does a -17 degree (negative) stem angle mean for my ride?

A: A negative 17-degree stem angle means the stem angles downward from the steerer tube, lowering the handlebar height relative to the fork. This creates a more aggressive, aerodynamic riding position that is favoured for trail and cross-country mountain biking where control and speed are priorities.

Q: How much does this bike stem weigh?

A: The BUCKLOS 70mm aluminum alloy bike stem weighs approximately 178.9 grams, thanks to its hollow construction and lightweight aluminum alloy material — keeping your build light without compromising strength.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.