Michelin Airstop Butyl Tubes
Does anyone use these? I bought one with a Michelin Carbon tire for my road bike. There was no locknut and (from what I can see) no place to screw one on. It's the first time I've seen this and I'm just wondering whether it was left out of the box or if Michelin doesn't consider the locknut necessary. It seems to me that it's an easy way for grit to find it's way in.
Any answers?