The FSA Afterburner is a forged aluminium stem for mountain and trail bikes. It fits a 1-1/8 inch steerer and a 31.8mm handlebar, and it carries a 12 degree angle that can be run either way up. Flipping the stem shifts the bar between a lower, racier position and a taller one without changing any other part.
The body is 3D forged from AL6061-T6 and then CNC machined, with a four-bolt cold-forged faceplate and chromoly hardware holding the bar. Fork clamp stack height is 34mm, which keeps the bar low over the headset. The finish is bead-blasted black with polished anodized black detail and two-tone laser graphics.
Quick Facts
| Feature |
Specification |
| Handlebar Clamp Diameter |
31.8mm |
| Steerer Diameter |
1-1/8 inch |
| Angle |
±12° (reversible) |
| Material |
3D forged and CNC machined AL6061-T6 |
| Claimed Weight |
128 g (100mm) |