Climbers and riders who want a light Specialized that isn't a full aero race bike. Not an endurance bike.
A lightweight road bike without the Tarmac's aero brief. It climbs and floats; it does not try to be a Tarmac SL8 in a crosswind. The position is still race-adjacent, not Roubaix-tall.
Sportives, gran fondos, and riders coming off a race bike who want more stack without going full gravel.
Taller stack, longer stays, and calmer steering than the Ultimate. It still pedals like a Canyon road bike, but it takes the edge off chipseal and all-day hours.
CX racers. If you want gravel capability, look at Checkpoint or Checkmate instead.
A UCI cyclocross race bike with IsoSpeed on some generations. Tight, muddy, and built to be shouldered — not a Checkpoint with CX tires.
| Measurement |  SpecializedAethos 2027 |  CanyonEndurace CF 2027 |  TrekBoone 2022 |
|---|---|---|---|
| Stackmm | 565 | 586+21 | 583+18 |
| Reachmm | 387 | 388+1 | 394+7 |
| Head tube angle° | 73.5 | 72.5−1.0 | 72.0−1.5 |
| Seat tube angle° | 73.5 | 73.5 | 73.5 |
| Chainstaymm | 410 | 415+5 | 425+15 |
| Wheelbasemm | 991 | 1012+21 | 1038+47 |
| BB dropmm | 72 | 75+3 | 66−6 |
| BB heightmm | — | — | — |
| Standovermm | — | — | — |
| Part | Aethos 56 | Endurace CF M | Boone 56 |
|---|---|---|---|
| Stem | 100 mm | 100 mm | 100 mm |
| Bar | 420 mm | 420 mm | 420 mm |
| Crank | 172.5 mm | 172.5 mm | 172.5 mm |
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