burnthesheep, when you rode the Felt DA series bike, did you know the spacing in the rear dropout? I'm considering a new disc wheel, but I'm worried about the narrow spacing in the rear. I borrowed a friend's HED disc with 25 mm extenral, and the carbon fairing *almost* rubbed the chainstays when it was pushed far forward in the dropout, so I pulled it back a bit. I'm considering a Zipp Super 9, but I'm not sure if the outer width is any more or less than the HED, I think it kinda depends on where you look online.