2025 Specialized Aethos 2 Expert vs 2025 Basso SV Shimano Dura Ace
The 51 is the Basso SV Shimano Dura Ace size closest to your 52 Specialized Aethos 2 Expert. 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 Basso SV Shimano Dura Ace
Compared with the Specialized Aethos 2 Expert in 52, the Basso SV Shimano Dura Ace in 51 places the top of the head tube 9 mm higher and 3 mm further forward, relative to the bottom bracket.
- Frame stack
- +9 mm
- Higher front end
- Frame reach
- +3 mm
- Longer frame reach
- Wheelbase
- +1 mm
- About the same
- Head angle
- −0.1°
- About the same head angle
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
Only the Specialized Aethos 2 Expert is drawn. The Basso SV Shimano Dura Ace numbers we have for size 51 are missing the chainstay length.
Geometry side by side
| Measurement | Specialized Aethos 2 Expert 52 | Basso SV Shimano Dura Ace 51 | Difference |
|---|---|---|---|
| Reach | 377 | 380 | +3 mm |
| Stack | 538 | 547 | +9 mm |
| Head tube angle | 72.1 | 72 | −0.1° |
| Seat tube angle | 74 | 74.7 | +0.7° |
| Effective top tube | 526 | 530 | +4 mm |
| Chainstay length | 410 | not listed | |
| Wheelbase | 981 | 982 | +1 mm |
| BB drop | 76.5 | not listed | |
| BB height | 265.5 | not listed | |
| Standover | 737 | 772 | +35 mm |
| Seat tube length | 470 | 485 | +15 mm |
| Head tube length | 128 | 140 | +12 mm |
Differences are the Basso SV Shimano Dura Ace minus the Specialized Aethos 2 Expert. Full charts: 2025 Specialized Aethos 2 Expert, 2025 Basso SV Shimano Dura Ace.
Where each sits in its class
Specialized Aethos 2 ExpertBasso 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 ExpertExpert | 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 |
| Bottom bracket | SRAM DUB GX | Shimano Dura-Ace R9200 |
| Wheelset | Roval C38 | DT Swiss ARC 1100 |
| Tire | S Works Turbo | Continental Grand Prix 5000 |
| Brake | SRAM Force E1 | Shimano Dura-Ace R9270 |
| Rotor | Shimano Ultegra R8170 | Shimano Dura Ace Ice Rotor |
| Handlebar | Roval Alpinist | Basso Fuga Integrated |
| Stem | Specialized Pro SL | Basso Fuga Integrated |
| Grips | Supacaz Super Sticky Kush | not listed |
| Seatpost | Roval Alpinist | not listed |
| Saddle | Specialized Power Expert | Selle Italia SLR Superflow |
| Chainring | not listed | Shimano 52, Shimano 36 |
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