2021 Specialized Aethos Founder's Edition vs 2020 Specialized Tarmac SL6
The Specialized Tarmac SL6 size closest to your 54 is the 54. Compare the 54 instead
What changes on the Specialized Tarmac SL6
Compared with the Specialized Aethos Founder's Edition in 54, the Specialized Tarmac SL6 in 49 places the top of the head tube 30 mm lower and 9 mm further back, relative to the bottom bracket. Its wheelbase is 5 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −30 mm
- Lower front end
- Frame reach
- −9 mm
- Shorter frame reach
- Wheelbase
- −5 mm
- Shorter: quicker to change direction
- Head angle
- −1.3°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Aethos Founder's Edition, 54Specialized Tarmac SL6, 49Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Aethos Founder's Edition 54 | Specialized Tarmac SL6 49 | Difference |
|---|---|---|---|
| Reach | 384mm | 375mm | −9 mm |
| Stack | 544mm | 514mm | −30 mm |
| Head tube angle | 73° | 71.75° | −1.3° |
| Seat tube angle | 74° | 75.5° | +1.5° |
| Chainstay length | 410mm | 410mm | ±0 mm |
| Wheelbase | 978mm | 973mm | −5 mm |
| BB drop | 72mm | 74mm | +2 mm |
| BB height | 268mm | 266mm | −2 mm |
| Standover | 748mm | 740mm | −8 mm |
| Seat tube length | 481mm | 431mm | −50 mm |
| Fork length | 369mm | 363mm | −6 mm |
| Head tube length | 137mm | 115mm | −22 mm |
Differences are the Specialized Tarmac SL6 minus the Specialized Aethos Founder's Edition. Full charts: 2021 Specialized Aethos Founder's Edition, 2020 Specialized Tarmac SL6.
Where each sits in its class
Specialized Aethos Founder's EditionSpecialized Tarmac SL6
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 Founder's EditionS-Works Founder's Edition | Specialized Tarmac SL6S-Works |
|---|---|---|
| Frame | Specialized S-Works Aethos FACT | not listed |
| Shifter | SRAM Red eTap AXS | not listed |
| Derailleur | SRAM RED eTAP AXS | SRAM RED eTAP AXS |
| Cassette | SRAM Red eTap | SRAM RED XG-1290 |
| Chain | SRAM Red | SRAM Red |
| Crankset | SRAM RED AXS Power Meter | SRAM RED AXS Power Meter |
| Bottom bracket | CeramicSpeed SRAM DUB | SRAM DUB |
| Wheelset | Roval Alpinist CLX | Roval CLX 50 |
| Tire | Specialized Turbo Cotton | Specialized Turbo Cotton |
| Brake | Shimano 105 | SRAM Red eTap AXS |
| Handlebar | Roval Alpinist Cockpit | not listed |
| Seatpost | Roval Alpinist | not listed |
| Saddle | Specialized S-Works Romin Evo | Specialized S-Works Power |
| Hub | not listed | Specialized LuHai_RVT66L-K5-B25-AN2-N4-F0 |
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