Don, yes the RAT's are quite nice and functional. Just I'm building my S5 to 14.5 lbs which isn't difficult but the RAT's weight 61g F, 68g's R as compared to approximately 60g combined for F&R bolt on through axles. They are low hanging fruit! In Collingwood only have a flat once every two years but in Florida where flat's are common and weight doesn't matter being flat will use RAT's. Also the bolt on's are more aero. Most of my weight savings are seat, axles, groupo (Dura Ace Mech) and my tubular wheels which with tires mounted are over 500 grams lighter than the factory wheels, same depth. Also purchased a second clincher/tubeless set I'm running Continental 5000's in a 28mm on for general use, training, Florida etc which at 50R, 44F are still 120 g lighter than factory E Tap build. My S3 2014 was around 14 lbs but with disc's even though running lighter seat the S5 is going to weight at least half a lb more. Disc's seem to add about one lb to the bike build with rotors, calibers and of course the heavier shifters. Unbelievably good looking bike the new S5, really a engineering tour de force. Looking forward to the handling which appears stellar based on all tests I've read. One of my friends just bought a new Venge which with no pedales and 50F,50R wheels is 14.9lbs on the scales. Will send pictures when I finish build. It's a black frame.
COR Co-organizer 2015
2010 Cannondale Rush MTB
Kona Jake The Snake Cross bike
2011 Cervelo R3 Red - sold
2013 Cervelo S5 Red
2014 Cervelo S3 Red 22