Designed by engineers passionate about time trials and triathlons, this FastTT Aero chain guide combines aerodynamic innovation with ease of use. If you convert your double-chainring crankset into an ultra-aerodynamic single-chainring setup, this guide will replace your bulky front derailleur to optimise airflow around the derailleur area, reducing drag and saving a few precious watts.

It also prevents accidental chainring changes at the most inopportune moments. Ideal for competitive cyclists seeking performance, it fits perfectly with round (50T to 62T) or oval (50T to 58T) chainrings.

Installation tips: Installation is quick and easy. First, remove your front derailleur, then attach the guide to the crankset using the screws provided, and adjust the height (24 mm travel) for perfect alignment with your chainring.

Technical specifications:

- 24 mm up/down adjustment (including frame mount)
- Suitable for round chainrings: 50T to 62T
- Suitable for oval chainrings: 50T to 58T
- 3D-printed in durable nylon
- Brand: FastTT