FSA Afterburner Stem

The FSA Afterburner is designed for a standard 1 1/8-inch steerer tube, which is the most common size found on modern mountain bikes. As long as your fork uses this standard diameter, it will fit securely.

This stem features a 31.8 mm handlebar clamp diameter. You should check your current handlebars to ensure they match this measurement, as it is a standard size for most trail and mountain bike setups.

A 12-degree angle provides a slightly more upright or aggressive position depending on whether you mount it with a positive or negative rise. It is designed to help you find a comfortable balance between climbing efficiency and control on descents.

Yes, the Afterburner is specifically engineered for aggressive trail use. Its forged aluminum construction prioritizes structural integrity and stiffness, ensuring your steering inputs remain precise even on technical, rough terrain.

Forging aligns the grain structure of the aluminum, which creates a stronger, more durable component than casting or machining alone. This makes it an excellent choice for mountain biking, where reliability under stress is critical.