[David]

The 4.5 is the bottom of Trek's carbon line, but since the frame is pretty new, I figured it was about as good as carbon would be for the price. It's a little thing, but the frame accepts a wireless sensor for wheel speed and cadence, which seemed pretty cool and keeps it clear of clutter. They didn't have my size in stock, so I road a 62cm. It really is amazing how little frame flex there is under hard acceleration with the carbon frame.

It has Shimano 105 group, but I couldn't see spending more than the $2,000 price to lose a pound or two with a better group. They don't post the weights and I don't have the bike yet, so we'll have to wait a week or two til I get it, but I figure it's about 18 pounds stock.

The wheels are Bontrager SSR which aren't super light, so I figure if get more into it I can spend another $1000 for wheels and a lighter cassette and lose over a pound.