He will be riding mostly flat and on rare occasion some hills. 3T costs 160 bucks more but still way lower than its MSRP.
I like the 3T but they are so new no one has review them yet. They are quite heavy at 1.8kg but a 40mm depth and 23mm width which are quite nice for flat terrain.
Ultegras are cheaper and proven to roll great and durable.
The rig is Ridley fenix and has all 3t components so I thought might as well round it up with matching wheels.

Any thought on 3T?