Schrader Valve to Presta Adapter Grommet (1x Pair)

I was unsure about purchasing these adaptors, but they are perfect for downsizing a schrader valve hole to accept a presta valve. Very simple but effective

Thy are two plastic grommets that friction fit into the hole in the wheel designed for Schrader valves and converts it into a hole for Presta valves. The design is effective and worked well. For what they are, (two little bits of plastic) they are a bit expensive in my opinion but they work well. You can just about make them out on this photo of the bike I fitted them on.