The bottom bracket.

"Beyond changes like moving to star-shaped lugs
(instead of round ones), and beefing up the
down tube 50 percent over the Colnago C59, the C60 has
some legitimately unique properties.

First, the patented ThreadFit 82.5 combines the
best of threaded and press-fit systems,
Fumagalli says. While press-fit bearings are
easy for bike makers to use, critics say the
system isn’t as secure or precise as a
traditional threaded bottom bracket. This can
lead to creaking and/or premature bearing wear."

http://m.bikeradar.com/road/news/articl ... king-40228

All these bottom bracket designs. It's proper mental I tell thee.