2025 Specialized Aethos 2 Expert vs 2026 Colnago V4Rs Shimano
The 50s is the Colnago V4Rs Shimano size closest to your 58 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 Colnago V4Rs Shimano
Compared with the Specialized Aethos 2 Expert in 58, the Colnago V4Rs Shimano in 50s places the top of the head tube 6 mm higher and 12 mm further forward, relative to the bottom bracket. Its wheelbase is 25 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +6 mm
- Higher front end
- Frame reach
- +12 mm
- Longer frame reach
- Wheelbase
- −25 mm
- Shorter: quicker to change direction
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- −2 mm
- About the same
The two frames
Only the Specialized Aethos 2 Expert is drawn. The Colnago V4Rs Shimano numbers we have for size 50s are missing the seat angle.
Geometry side by side
| Measurement | Specialized Aethos 2 Expert 58 | Colnago V4Rs Shimano 50s | Difference |
|---|---|---|---|
| Reach | 398 | 410 | +12 mm |
| Stack | 606 | 612 | +6 mm |
| Head tube angle | 73 | 73 | ±0.0° |
| Seat tube angle | 75.5 | not listed | |
| Effective top tube | 572 | not listed | |
| Chainstay length | 410 | 408 | −2 mm |
| Wheelbase | 1013 | 988 | −25 mm |
| BB drop | 73.5 | 72 | −2 mm |
| BB height | 268.5 | not listed | |
| Standover | 805 | not listed | |
| Seat tube length | 535 | not listed | |
| Head tube length | 198 | not listed |
Differences are the Colnago V4Rs Shimano minus the Specialized Aethos 2 Expert. Full charts: 2025 Specialized Aethos 2 Expert, 2026 Colnago V4Rs Shimano.
Where each sits in its class
Specialized Aethos 2 ExpertColnago V4Rs Shimano
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 | Colnago V4Rs ShimanoShimano Dura-Ace Di2 |
|---|---|---|
| Frame | Specialized Aethos 2 | Colnago V4Rs |
| Shifter | SRAM Force AXS E1 | Shimano Dura Ace Di2 |
| Derailleur | SRAM Force AXS E1 | Shimano Dura-Ace Di2, Shimano RD-9250 Dura-Ace Di2 |
| Cassette | SRAM Force | Shimano Dura-Ace |
| Chain | SRAM Force D1 | Shimano Dura-Ace |
| Crankset | SRAM Force E1 XPLR 1x | Shimano Dura-Ace |
| Bottom bracket | SRAM DUB GX | CeramicSpeed T47 |
| Wheelset | Roval C38 | Shimano Dura-Ace C50 |
| Tire | S Works Turbo | Pirelli P Zero Race |
| Brake | SRAM Force E1 | Shimano Dura-Ace Di2, Shimano Dura-Ace 9270 Di2 |
| Rotor | Shimano Ultegra R8170 | Shimano CL900 |
| Handlebar | Roval Alpinist | Colnago CC.01 |
| Stem | Specialized Pro SL | Colnago CC.01 |
| Grips | Supacaz Super Sticky Kush | not listed |
| Seatpost | Roval Alpinist | Colnago D-shape carbon |
| Saddle | Specialized Power Expert | Prologo Scratch M5 CPC |
| Fork | not listed | Colnago carbon fork |
| Chainring | not listed | Shimano Dura-Ace, Shimano Dura-Ace R9200 |
| Bar tape | not listed | Colnago Grip |
| Headset | not listed | CeramicSpeed SLT |
| Bottle cage | not listed | Colnago bottle cage |
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