I have a Cahberg Duke helmet, which is a flip up. A mate of mine who has a flip helmet has a similar mount to this and he was able to install his mount upside down to still be able to access the flip release button, but this has a longer 'Y' shaped base so even upside down it covers the flip release button.I finally accepted that I could only use my helmet as a full face (which TBF is the way it's worn when I'm riding), but even when installed the right way up, my Cahberg has an angular chin mount (not rounded) and a windguard which I needed to remove to get it to fit, even with the windguard removed it doesn't quite sit right on the angular shaped chin, it's better suited to a rounded chin.I'm due a new helmet soon anyway, so instead of choosing another Cahberg, I'll probably go with an HJC as their more rounded at the front and they have a catch underneath the chin instead off a flip release button.The straps are a bit long and with the chin guard removed do flap about a bit inside the helmet as I get wind under the chin and through the gap where the visor doesn't quite close properly with the strap preventing it from 'snapping' shut, this seems to cause turbulence inside the visor and around my mouth. Might sound like a small thing as I can cut the straps down, but even so turbulence inside my helmet around my face is costing it a star.