CYSKY Adjustable Bike Stem 145mm Reach, Aluminum CNC Forged, ±90° Pivot for 31.8mm and 25.4mm Bars

The CYSKY Bike Stem is an adjustable aluminum stem that fits 31.8mm and 25.4mm bars, pivots ±90° and extends 145mm to raise or lower your handlebars for a tailored riding position.

Upgrade your bicycle's fit and control with a forged-aluminum, CNC-machined stem designed for a wide range of bikes, from mountain to city commuters. This stem includes a built-in shim for 31.8→25.4mm conversion, a 145mm reach for stable steering, and a wide angle range so you can dial in a comfortable posture without replacing the fork or handlebars.

How does this stem change my riding position?

The pivoting head adjusts from -90° to +90°, allowing significant changes to the handlebar height and angle. By changing the stem angle you can move between a more upright position for comfort and a lower, more aerodynamic stance for more aggressive riding.

• Angle range: -90° to +90° for extensive height and reach adjustments
• Length: 145mm provides longer reach and improved stability
• Fine tune without replacing bar or fork thanks to the adjustable head

Will it fit my handlebars and fork steerer?

This stem supports the common 31.8mm handlebar diameter and includes a shim to accept 25.4mm bars as well. The steerer clamp accepts a standard 28.6mm (1-1/8") fork tube, making it compatible with most modern and older bikes alike.

• Accepts 31.8mm bars; includes 31.8→25.4mm adapter
• Front fork steerer clamp: 28.6mm (1-1/8") standard size
• Designed to work across MTB, road, BMX, city and track frames

What materials and build quality does the stem offer?

Made from precision 3D-forged aluminum alloy and finished with CNC machining, the stem resists deformation and corrosion. The machining leaves a durable surface that is easy to clean and maintains appearance over time.

• Construction: 3D forged aluminum alloy for strength and lightness
• CNC process ensures precise tolerances and clean finish
• Weight: approx. 353 g (0.78 lb) — balance of durability and manageable mass

How easy is installation and what’s included?

The stem ships with the necessary shim for bar size conversion and two hex wrenches so you can install it at home. The clamp design and hardware layout make alignment straightforward; torque carefully to manufacturer guidelines for safety.

• Package: Bicycle stem ×1, 31.8→25.4mm shim ×1, hex wrenches ×2
• Simple fit process for common steerer and bar sizes
• Adjustable head lets you set angle before final tightening

Who is this for? Riders looking to modify or upgrade bicycle fit—whether commuters needing a more comfortable upright posture, mountain bikers tuning handling, BMX and track riders customizing geometry, or DIY enthusiasts replacing worn stems—will find this CYSKY stem a versatile, cost-effective option. It’s especially useful when you want a broad angle range and compatibility with both 31.8mm and 25.4mm handlebars without buying multiple stems. Always ensure correct torque settings and periodic inspection after installation.