I had a BD Hemisphere for a year, and hated it. It was like a portable sauna, and had such a high profile I banged my head on every small rooflet within a mile of my head. I now use a Petzl Elios and love it. Light, comfortable, on rock or alpine. Plus I never bang my noggin.
Dunno about the bike helmet. Most new helmets have holes in the top of the head, which makes them pointless for rockfall, but the older designs might be okay. I wouldn't put anything on my head except a certified climbing helmet though.
Kyle
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