Factor O2 VAM
Climbers who want Factor. Ostro if you also care about aero.
Factor's lightweight race bike. Less aero than Ostro, still a low race fit.
Climbers who want Factor. Ostro if you also care about aero.
Factor's lightweight race bike. Less aero than Ostro, still a low race fit.
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.
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 SL7 in a crosswind. The position is still race-adjacent, not Roubaix-tall.
Racers who want a climbing Orbea. Orca Aero is the wind-cheating sibling.
Orbea's lightweight race bike, OMX carbon on high kits, and a fit that is race-low without S5 drama. OMX vs OMR changes weight more than geometry.
| Measurement |  FactorO2 VAM 2023 |  TrekBoone 2022 |  SpecializedAethos 2022 |  OrbeaOrca 2025 |
|---|---|---|---|---|
| Stackmm | 565 | 583+18 | 565 | 552−13 |
| Reachmm | 388 | 394+6 | 387−1 | 385−3 |
| Head tube angle° | 73.3 | 72.0−1.3 | 73.5+0.2 | 72.8−0.5 |
| Seat tube angle° | 73.2 | 73.5+0.3 | 73.5+0.3 | 73.5+0.3 |
| Chainstaymm | 405 | 425+20 | 410+5 | 408+3 |
| Wheelbasemm | 993 | 1038+45 | 991−2 | 981−12 |
| BB dropmm | 70 | 66−4 | 72+2 | 70 |
| BB heightmm | — | — | — | — |
| Standovermm | — | — | — | — |
| Part | O2 VAM 56 | Boone 56 | Aethos 56 | Orca 53 |
|---|---|---|---|---|
| Stem | 100 mm | 100 mm | 100 mm | 90 mm |
| Bar | 420 mm | 420 mm | 420 mm | 400 mm |
| Crank | 172.5 mm | 172.5 mm | 172.5 mm | 170 mm |
Today the O2 VAM is officially available with Factor describing it as the “world's fastest climbing bike”. Claimed weight for the frame is just 730g for a size ...
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