Originally Posted by habitus
the eggbeater cleats are compatible with eggbeaters, candys, and mallets. i'm not sure about the new quattros, though.
I think the attachment part is the same, but you don't get the benefit of the larger surrounding platform. In a pinch, you could probably use regular eggbeater cleats on road shoes to fit quattros, but it might be more difficult with the larger tread of mountain shoes.