This is what a custom bike is all about-fitting the rider and the needs of that rider. This bike will be going up and down some steep hills in San Fransisco and elsewhere, hence the need for some powerful disc brakes . The bike will also be fitted with super low gears for climbing the often over 14 % grades.
The frame will use a tapered steerer Enve carbon 'cross disc fork, a good choice for the added loads of the hydraulic disc brakes.
Not having rim brakes makes for a simple, clean look to the rear stays.