2024 BMC Roadmachine 01 THREE vs 2026 Specialized Aethos 2
The 61 is the Specialized Aethos 2 size closest to your 58 BMC Roadmachine 01 THREE. We match frame stack and reach. This is a geometry comparison, not a fit recommendation; stem, spacers, handlebars and saddle setup also affect your riding position.
What changes on the Specialized Aethos 2
Compared with the BMC Roadmachine 01 THREE in 58, the Specialized Aethos 2 in 61 places the top of the head tube 7 mm higher and 11 mm further forward, relative to the bottom bracket. Its wheelbase is 3 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +7 mm
- Higher front end
- Frame reach
- +11 mm
- Longer frame reach
- Wheelbase
- −3 mm
- Shorter: quicker to change direction
- Head angle
- +1.3°
- Steeper: sharper steering
- Chainstays
- −5 mm
- Shorter: livelier
The two frames
BMC Roadmachine 01 THREE, 58Specialized Aethos 2, 61Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | BMC Roadmachine 01 THREE 58 | Specialized Aethos 2 61 | Difference |
|---|---|---|---|
| Reach | 393 | 404 | +11 mm |
| Stack | 620 | 627 | +7 mm |
| Head tube angle | 72.2 | 73.5 | +1.3° |
| Seat tube angle | 74.2 | 74 | −0.2° |
| Effective top tube | 571 | 584 | +13 mm |
| Chainstay length | 415 | 410 | −5 mm |
| Wheelbase | 1023 | 1020 | −3 mm |
| BB drop | 75 | 73.5 | −2 mm |
| Standover | 828 | not listed | |
| Seat tube length | 529 | not listed | |
| Fork length | 379 | not listed | |
| Head tube length | 207 | 218 | +11 mm |
Differences are the Specialized Aethos 2 minus the BMC Roadmachine 01 THREE. Full charts: 2024 BMC Roadmachine 01 THREE, 2026 Specialized Aethos 2.
Where each sits in its class
BMC Roadmachine 01 THREESpecialized Aethos 2
Each bike is ranked against the other road bikes on Quiver, on frame geometry alone. Not your hand position or ride feel.
What each ships with
The stock build of each bike's first listed trim. Parts that match are dimmed.
| Part | BMC Roadmachine 01 THREETHREE | Specialized Aethos 2S-Works |
|---|---|---|
| Frame | BMC Roadmachine 01 | Specialized Aethos 2 |
| Shifter | SRAM eTap Force | SRAM RED |
| Derailleur | SRAM eTap Force AXS | SRAM Red AXS E1 |
| Cassette | SRAM Force | Shimano Dura-Ace R9200 |
| Chain | SRAM Apex | SRAM RED E1 |
| Crankset | SRAM Force | SRAM Powermeter Red AXS |
| Chainring | SRAM Force, SRAM Force AXS 40t | Shimano Dura-Ace R9200 |
| Bottom bracket | BMC PF86 | SRAM DUB |
| Wheelset | BMC CRD-321 SL Carbon | Roval Alpinist CLX III |
| Tire | Vittoria Corsa N.EXT | Specialized Turbo TLR Race |
| Hub | CRD-321 SL | Roval LF21-F |
| Rim | CRD-321 SL | not listed |
| Brake | SRAM eTap Force AXS | Shimano Dura-Ace R9200 |
| Rotor | SRAM CenterLine X | Shimano Dura-Ace R9200 |
| Handlebar | Easton EC70 SL Carbon | Roval Alpinist Cockpit II |
| Stem | BMC ICS2 | Roval Alpinist Cockpit II |
| Seatpost | BMC Roadmachine 01 D-Shaped | Roval Alpinist |
| Saddle | fizik Argo Tempo R5 | Specialized Power |
| Bag | BMC Storage Pouch | not listed |
| Bar tape | not listed | Supacaz Super Sticky Kush |
| Headset | not listed | CeramicSpeed SLT |
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