2026 Specialized Aethos 2 vs 2026 Colnago V4Rs Shimano
The 48.5 is the Colnago V4Rs Shimano size closest to your 49 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 49, the Colnago V4Rs Shimano in 48.5 places the top of the head tube 17 mm higher and 10 mm further forward, relative to the bottom bracket.
- Frame stack
- +17 mm
- Higher front end
- Frame reach
- +10 mm
- Longer frame reach
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- +0.1°
- 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 48.5 are missing the wheelbase.
Geometry side by side
| Measurement | Specialized Aethos 2 49 | Colnago V4Rs Shimano 48.5 | Difference |
|---|---|---|---|
| Reach | 373 | 383 | +10 mm |
| Stack | 522 | 539 | +17 mm |
| Head tube angle | 71.4 | 71.5 | +0.1° |
| Seat tube angle | 75.5 | 74.5 | −1.0° |
| Effective top tube | 508 | 535 | +27 mm |
| Chainstay length | 410 | 408 | −2 mm |
| Wheelbase | 978 | not listed | |
| BB drop | 75.5 | 72 | −4 mm |
| Head tube length | 114 | 130 | +16 mm |
| Seat tube length | not listed | 485 |
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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