The Birdcage looks like a fairly conventional “aero” style rim, but there is more to it than that. The first clue comes from the name, birds have hollow bones to save weight whilst retaining as much strength as possible, and the Birdcage rim has a hollow bead for the same reason. Another innovation is adapted cross-lacing design to the narrow inner wall of the Birdcage rim. Traditionally, the greatest flaw in “aero” rims has been the valve hole. With the Birdcage, GSport designers offset the valve hole so that this section can retain its strength. A handy side-effect of this is that fitting a pump is now more convenient. They’ve ensured that the deep center allows for easy tire removal and fitting, and made sure that the sidewalls, while slimmed down, are still suitable for brake use.

Specifications:
- welded seam
- aero style rim
- lightweight rim
- hollow rim bead
- cross lacing
- width: 34mm
- height: 21mm