2025 Basso SV Shimano Dura Ace vs 2027 Specialized Aethos 2 SRAM
The 54 is the Specialized Aethos 2 SRAM size closest to your 53 Basso SV Shimano Dura Ace. 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 SRAM
Compared with the Basso SV Shimano Dura Ace in 53, the Specialized Aethos 2 SRAM in 54 places the top of the head tube at about the same height and about as far forward, relative to the bottom bracket. Its wheelbase is 5 mm longer, which can contribute to stability at speed.
- Frame stack
- −1 mm
- About the same height
- Frame reach
- −1 mm
- About the same reach
- Wheelbase
- +5 mm
- Longer: steadier at speed
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
We can't draw these frames yet. The Basso SV Shimano Dura Ace numbers we have for size 53 are missing the chainstay length. The numbers below still compare.
Geometry side by side
| Measurement | Basso SV Shimano Dura Ace 53 | Specialized Aethos 2 SRAM 54 | Difference |
|---|---|---|---|
| Reach | 385 | 384mm | −1 mm |
| Stack | 560 | 559mm | −1 mm |
| Head tube angle | 72.5 | 72.5° | ±0.0° |
| Seat tube angle | 74 | 74° | ±0.0° |
| Effective top tube | 546 | 544mm | −2 mm |
| Wheelbase | 987 | 992mm | +5 mm |
| Standover | 789 | 759mm | −30 mm |
| Seat tube length | 505 | 490mm | −15 mm |
| Head tube length | 152 | 150mm | −2 mm |
| Chainstay length | not listed | 410mm | |
| BB drop | not listed | 75mm | |
| BB height | not listed | 267mm | |
| Fork length | not listed | 372mm |
Differences are the Specialized Aethos 2 SRAM minus the Basso SV Shimano Dura Ace. Full charts: 2025 Basso SV Shimano Dura Ace, 2027 Specialized Aethos 2 SRAM.
Where each sits in its class
Basso SV Shimano Dura AceSpecialized Aethos 2 SRAM
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 | Basso SV Shimano Dura AceShimano Dura Ace Di2 | Specialized Aethos 2 SRAMS-Works - SRAM RED AXS |
|---|---|---|
| Frame | Basso SV | Specialized S-Works Aethos 2 FACT |
| Shifter | Shimano Dura-Ace R9270 | SRAM RED AXS E1 |
| Derailleur | Shimano Dura-Ace R9250 | SRAM RED AXS E1 |
| Cassette | Shimano Dura-Ace R9200 | SRAM RED XG-1290 E1 |
| Chain | Shimano Dura-Ace | SRAM Red E1 flat-top |
| Crankset | Shimano Dura-Ace R9200 | SRAM RED AXS E1 |
| Chainring | Shimano 52, Shimano 36 | not listed |
| Bottom bracket | Shimano Dura-Ace R9200 | Specialized Alpha |
| Wheelset | DT Swiss ARC 1100 | Roval Rapide CLX |
| Tire | Continental Grand Prix 5000 | Specialized Cotton TLR |
| Brake | Shimano Dura-Ace R9270 | SRAM Red E1 |
| Rotor | Shimano Dura Ace Ice Rotor | not listed |
| Handlebar | Basso Fuga Integrated | Roval Alpinist Cockpit II |
| Stem | Basso Fuga Integrated | not listed |
| Saddle | Selle Italia SLR Superflow | Specialized S-Works Power |
| Seatpost | not listed | Roval Alpinist |
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