Climbers and riders who bought Trek for weight before the Madone absorbed this brief. Compare stack/reach to the Madone SLR on current years.
The lightweight Trek race bike of the 2010s–early 2020s: rounder tubes than the Madone, a sharp climb, and less aero drama. Later years sit close to Madone numbers.
Sportive and rough-road riders who found R5/S5 too low.
Cervelo endurance road: taller, more tire room, all-day. It is not a slow bike — it is an R5 that sat up.
Adventure and all-road riders who want more stability than the Grail race bike.
Slacker and more stable than the Grail, with room for bigger tires. Planted on rough doubletrack and less nervous at bikepacking pace.