I originally had Fulcrum 6's (came with the bike) on my Tarmac. They are a cross between a 5 and a 7 so I've been told. They are workmanlike wheels and seem to be able to take a pounding quite well. However, I like my PSIMET 50 mm carbon wheels better as they spin up quicker, better on the hills - though they are a tad bit twitcher with Conti 4000. In short - Fulcrum seem to be nice, durable wheels which I would snap on the bike if I were going into rougher waters.