2026 Specialized Aethos 2 Expert vs 2026 BMC Roadmachine TWO
We can't match sizes for these two: one of them has no stack and reach for the sizes shown.
What changes on the BMC Roadmachine TWO
- Frame stack
- n/a
- One of the bikes has no number for this
- Frame reach
- n/a
- One of the bikes has no number for this
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- −0.8°
- Slacker: calmer steering
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
Only the Specialized Aethos 2 Expert is drawn. The BMC Roadmachine TWO numbers we have for size 54 are missing the reach, stack, seat angle, chainstay length and wheelbase.
Geometry side by side
| Measurement | Specialized Aethos 2 Expert 56 | BMC Roadmachine TWO 54 | Difference |
|---|---|---|---|
| Reach | 391 | not listed | |
| Stack | 580 | not listed | |
| Head tube angle | 73 | 72.2 | −0.8° |
| Seat tube angle | 74 | not listed | |
| Effective top tube | 557 | not listed | |
| Chainstay length | 410 | not listed | |
| Wheelbase | 998 | not listed | |
| BB drop | 75 | not listed | |
| Standover | 779 | 770 | −9 mm |
| Seat tube length | 510 | not listed | |
| Head tube length | 169 | not listed | |
| Fork length | not listed | not listed |
Differences are the BMC Roadmachine TWO minus the Specialized Aethos 2 Expert. Full charts: 2026 Specialized Aethos 2 Expert, 2026 BMC Roadmachine TWO.
Where each sits in its class
Specialized Aethos 2 ExpertBMC Roadmachine TWO
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 | Specialized Aethos 2 ExpertExpert | BMC Roadmachine TWOTWO |
|---|---|---|
| Frame | Specialized FACT Aethos 2 10r | BMC Roadmachine |
| Fork | Specialized FACT Aethos 2 10r Carbon | not listed |
| Shifter | Shimano Ultegra R8170 Di2 | Shimano 105 R7170 |
| Derailleur | Shimano Ultegra R8150 Di2 front | Shimano 105 R7150 Di2, Shimano 105 R7150 |
| Cassette | Shimano Ultegra | Shimano CS-HG710 |
| Chain | Shimano XT M8100 | Shimano Deore M6100 |
| Crankset | Shimano Ultegra R8100 | Shimano 105 R7100 |
| Chainring | Shimano Ultegra R8100, SRAM 35 | Shimano 50T, Shimano 34T |
| Bottom bracket | SRAM DUB GX | Shimano BB-RS500-PB |
| Wheelset | Roval C38 | PRD23 |
| Tire | Specialized S-Works Turbo | Vittoria Rubino V |
| Brake | Shimano Ultegra R8170 Di2 | Shimano 105 R7170 Di2 |
| Rotor | Shimano Ultegra | Shimano SM-RT70, Shimano 160mm |
| Handlebar | Roval Alpinist | BMC HB D4 03 |
| Stem | Specialized Pro SL | BMC RSM 01 |
| Grips | Supacaz Super Sticky Kush | not listed |
| Seatpost | Roval Alpinist | BMC Roadmachine Carbon D-shaped |
| Saddle | Specialized Body Geometry Power Expert | Selle Italia Model X Superflow |
| Bag | not listed | Storage Pouch |
| Light | not listed | BMC Integrated Rear Light 25 |
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