2026 Specialized Aethos 2 vs 2026 Colnago V4Rs Shimano
The 50s is the Colnago V4Rs Shimano size closest to your 58 Specialized Aethos 2. 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 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 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 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 | 74 | 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 |
| Head tube length | 198 | not listed | |
| Seat tube length | not listed | not listed |
Differences are the Colnago V4Rs Shimano minus the Specialized Aethos 2. Full charts: 2026 Specialized Aethos 2, 2026 Colnago V4Rs Shimano.
Where each sits in its class
Specialized Aethos 2Colnago 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 2S-Works | Colnago V4Rs ShimanoShimano Dura-Ace Di2 |
|---|---|---|
| Frame | Specialized Aethos 2 | Colnago V4Rs |
| Shifter | SRAM RED | Shimano Dura Ace Di2 |
| Derailleur | SRAM Red AXS E1 | Shimano Dura-Ace Di2, Shimano RD-9250 Dura-Ace Di2 |
| Cassette | Shimano Dura-Ace R9200 | Shimano Dura-Ace |
| Chain | SRAM RED E1 | Shimano Dura-Ace |
| Crankset | SRAM Powermeter Red AXS | Shimano Dura-Ace |
| Chainring | Shimano Dura-Ace R9200 | Shimano Dura-Ace, Shimano Dura-Ace R9200 |
| Bottom bracket | SRAM DUB | CeramicSpeed T47 |
| Wheelset | Roval Alpinist CLX III | Shimano Dura-Ace C50 |
| Tire | Specialized Turbo TLR Race | Pirelli P Zero Race |
| Hub | Roval LF21-F | not listed |
| Brake | Shimano Dura-Ace R9200 | Shimano Dura-Ace Di2, Shimano Dura-Ace 9270 Di2 |
| Rotor | Shimano Dura-Ace R9200 | Shimano CL900 |
| Handlebar | Roval Alpinist Cockpit II | Colnago CC.01 |
| Stem | Roval Alpinist Cockpit II | Colnago CC.01 |
| Bar tape | Supacaz Super Sticky Kush | Colnago Grip |
| Headset | CeramicSpeed SLT | CeramicSpeed SLT |
| Seatpost | Roval Alpinist | Colnago D-shape carbon |
| Saddle | Specialized Power | Prologo Scratch M5 CPC |
| Fork | not listed | Colnago carbon fork |
| Bottle cage | not listed | Colnago bottle cage |
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