2026 Specialized Aethos 2 Pro vs 2025 Basso SV Shimano Dura Ace
The Basso SV Shimano Dura Ace size closest to your 54 is the 53. Compare the 53 instead
What changes on the Basso SV Shimano Dura Ace
Compared with the Specialized Aethos 2 Pro in 54, the Basso SV Shimano Dura Ace in 56 places the top of the head tube 25 mm higher and 3 mm further forward, relative to the bottom bracket.
- Frame stack
- +25 mm
- Higher front end
- Frame reach
- +3 mm
- Longer frame reach
- Wheelbase
- −1 mm
- About the same
- Head angle
- +0.5°
- Steeper: sharper steering
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
Only the Specialized Aethos 2 Pro is drawn. The Basso SV Shimano Dura Ace numbers we have for size 56 are missing the chainstay length.
Geometry side by side
| Measurement | Specialized Aethos 2 Pro 54 | Basso SV Shimano Dura Ace 56 | Difference |
|---|---|---|---|
| Reach | 384 | 387 | +3 mm |
| Stack | 559 | 584 | +25 mm |
| Head tube angle | 72.5 | 73 | +0.5° |
| Seat tube angle | 74 | 73.5 | −0.5° |
| Effective top tube | 544 | 560 | +16 mm |
| Chainstay length | 410 | not listed | |
| Wheelbase | 992 | 991 | −1 mm |
| BB drop | 75 | not listed | |
| Head tube length | 150 | 170 | +20 mm |
| Standover | not listed | 810 | |
| Seat tube length | not listed | 535 |
Differences are the Basso SV Shimano Dura Ace minus the Specialized Aethos 2 Pro. Full charts: 2026 Specialized Aethos 2 Pro, 2025 Basso SV Shimano Dura Ace.
Where each sits in its class
Specialized Aethos 2 ProBasso SV Shimano Dura Ace
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 ProPro | Basso SV Shimano Dura AceShimano Dura Ace Di2 |
|---|---|---|
| Frame | Specialized Aethos 2 | Basso SV |
| Shifter | SRAM Force AXS E1 | Shimano Dura-Ace R9270 |
| Derailleur | SRAM Force AXS E1 | Shimano Dura-Ace R9250 |
| Cassette | SRAM Force | Shimano Dura-Ace R9200 |
| Chain | SRAM Force D1 | Shimano Dura-Ace |
| Crankset | SRAM Force E1 XPLR 1x | Shimano Dura-Ace R9200 |
| Chainring | SRAM Force E1 | Shimano 52, Shimano 36 |
| Bottom bracket | SRAM DUB GX | Shimano Dura-Ace R9200 |
| Wheelset | Roval Alpinist CL II | DT Swiss ARC 1100 |
| Tire | Specialized Turbo TLR Race | Continental Grand Prix 5000 |
| Brake | SRAM Force E1 | Shimano Dura-Ace R9270 |
| Rotor | SRAM Force E1 | Shimano Dura Ace Ice Rotor |
| Handlebar | Roval Alpinist Cockpit II | Basso Fuga Integrated |
| Stem | Roval Alpinist Cockpit II | Basso Fuga Integrated |
| Grips | Supacaz Super Sticky Kush | not listed |
| Seatpost | Roval Alpinist Carbon S-Works | not listed |
| Saddle | Specialized Power Pro Mirror | Selle Italia SLR Superflow |
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