2019 Specialized Tarmac SL6 Disc Sagan Collection LTD vs 2021 Specialized Aethos
The 49 is the Specialized Aethos size closest to your 44 Specialized Tarmac SL6 Disc Sagan Collection LTD. 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
Compared with the Specialized Tarmac SL6 Disc Sagan Collection LTD in 44, the Specialized Aethos in 49 places the top of the head tube 14 mm higher and 10 mm further forward, relative to the bottom bracket. Its wheelbase is 4 mm longer, which can contribute to stability at speed.
- Frame stack
- +14 mm
- Higher front end
- Frame reach
- +10 mm
- Longer frame reach
- Wheelbase
- +4 mm
- Longer: steadier at speed
- Head angle
- +1.3°
- Steeper: sharper steering
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Tarmac SL6 Disc Sagan Collection LTD, 44Specialized Aethos, 49Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Tarmac SL6 Disc Sagan Collection LTD 44 | Specialized Aethos 49 | Difference |
|---|---|---|---|
| Reach | 365mm | 375mm | +10 mm |
| Stack | 500mm | 514mm | +14 mm |
| Head tube angle | 70.5° | 71.75° | +1.3° |
| Seat tube angle | 76° | 75.5° | −0.5° |
| Effective top tube | 490mm | not listed | |
| Chainstay length | 410mm | 410mm | ±0 mm |
| Wheelbase | 969mm | 973mm | +4 mm |
| BB drop | 74mm | 74mm | ±0 mm |
| BB height | 266mm | 266mm | ±0 mm |
| Standover | 730mm | 705mm | −25 mm |
| Seat tube length | 400mm | 431mm | +31 mm |
| Fork length | 363mm | 369mm | +6 mm |
| Head tube length | 105mm | 109mm | +4 mm |
Differences are the Specialized Aethos minus the Specialized Tarmac SL6 Disc Sagan Collection LTD. Full charts: 2019 Specialized Tarmac SL6 Disc Sagan Collection LTD, 2021 Specialized Aethos.
Where each sits in its class
Specialized Tarmac SL6 Disc Sagan Collection LTDSpecialized Aethos
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 Tarmac SL6 Disc Sagan Collection LTD | Specialized AethosAethos Frameset |
|---|---|---|
| Frame | not listed | Specialized Aethos FACT |
| Seatpost | not listed | Roval Alpinist |
Know what is on every bike.
Add your bike to Quiver. Keep its parts, setup, and service history together, then share your build.
Explore the app
