Aside from the F1, Felt also upgraded the DA for 2011. Engineered with the help of new computer technology with the goal to come up with a faster and stiffer TT and triathlon bike, the DA for 2011 seems to fit the bill.
The 2011 DA features V-brakes for better aerodynamics, BB30 bottom bracket shell and a frame which has 25% more surface area than the 2010 model. Even with this notable change, the 2011 DA is only 2% heavier.
Felt claims that the new DA is 14% faster and 13% stiffer than its predecessor. It features S-Bend down tube as well as lipped seat tube for maximum performance. It also has a Bayonet 3 headtube and fork at 35mm. Currently, Felt makes use of 3/4″ bearings.
There is an adjustable rise stem integrated into the Bayonet system and a more durable seatpost clamp to address complaints on the 2010 DA clamps that gets broken easily. Spec’d with the electronic Shimano Dura-Ace kit, the seatpost is essentially designed with having the Di2 battery pack in use.
The 2011 DA is more efficient due to its make, design and tested well against not only wind tunnel or head wind conditions but also cross wind conditions or wind coming at you from different angles.