2027 Specialized Aethos 2 SRAM vs 2026 Colnago V4Rs Shimano
The 51 is the Colnago V4Rs Shimano size closest to your 56 Specialized Aethos 2 SRAM. 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 SRAM in 56, the Colnago V4Rs Shimano in 51 places the top of the head tube 23 mm lower and 3 mm further back, relative to the bottom bracket.
- Frame stack
- −23 mm
- Lower front end
- Frame reach
- −3 mm
- Shorter frame reach
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- −1.2°
- Slacker: calmer steering
- Chainstays
- −2 mm
- About the same
The two frames
Only the Specialized Aethos 2 SRAM is drawn. The Colnago V4Rs Shimano numbers we have for size 51 are missing the wheelbase.
Geometry side by side
| Measurement | Specialized Aethos 2 SRAM 56 | Colnago V4Rs Shimano 51 | Difference |
|---|---|---|---|
| Reach | 391mm | 388 | −3 mm |
| Stack | 580mm | 557 | −23 mm |
| Head tube angle | 73° | 71.8 | −1.2° |
| Seat tube angle | 74° | 74 | ±0.0° |
| Effective top tube | 557mm | 550 | −7 mm |
| Chainstay length | 410mm | 408 | −2 mm |
| Wheelbase | 998mm | not listed | |
| BB drop | 75mm | 72 | −3 mm |
| BB height | 267mm | not listed | |
| Standover | 779mm | not listed | |
| Seat tube length | 510mm | 510 | ±0 mm |
| Fork length | 372mm | not listed | |
| Head tube length | 169mm | 148 | −21 mm |
Differences are the Colnago V4Rs Shimano minus the Specialized Aethos 2 SRAM. Full charts: 2027 Specialized Aethos 2 SRAM, 2026 Colnago V4Rs Shimano.
Where each sits in its class
Specialized Aethos 2 SRAMColnago 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 SRAMS-Works - SRAM RED AXS | Colnago V4Rs ShimanoShimano Dura-Ace Di2 |
|---|---|---|
| Frame | Specialized S-Works Aethos 2 FACT | Colnago V4Rs |
| Shifter | SRAM RED AXS E1 | Shimano Dura Ace Di2 |
| Derailleur | SRAM RED AXS E1 | Shimano Dura-Ace Di2, Shimano RD-9250 Dura-Ace Di2 |
| Cassette | SRAM RED XG-1290 E1 | Shimano Dura-Ace |
| Chain | SRAM Red E1 flat-top | Shimano Dura-Ace |
| Crankset | SRAM RED AXS E1 | Shimano Dura-Ace |
| Bottom bracket | Specialized Alpha | CeramicSpeed T47 |
| Wheelset | Roval Rapide CLX | Shimano Dura-Ace C50 |
| Tire | Specialized Cotton TLR | Pirelli P Zero Race |
| Brake | SRAM Red E1 | Shimano Dura-Ace Di2, Shimano Dura-Ace 9270 Di2 |
| Handlebar | Roval Alpinist Cockpit II | Colnago CC.01 |
| Seatpost | Roval Alpinist | Colnago D-shape carbon |
| Saddle | Specialized S-Works Power | Prologo Scratch M5 CPC |
| Fork | not listed | Colnago carbon fork |
| Chainring | not listed | Shimano Dura-Ace, Shimano Dura-Ace R9200 |
| Rotor | not listed | Shimano CL900 |
| Stem | not listed | Colnago CC.01 |
| Bar tape | not listed | Colnago Grip |
| Headset | not listed | CeramicSpeed SLT |
| Bottle cage | not listed | Colnago bottle cage |
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