2021 Specialized Aethos Founder's Edition vs 2019 Specialized Tarmac Men's Disc
The Specialized Tarmac Men's Disc size closest to your 54 is the 54. Compare the 54 instead
What changes on the Specialized Tarmac Men's Disc
Compared with the Specialized Aethos Founder's Edition in 54, the Specialized Tarmac Men's Disc in 52 places the top of the head tube 17 mm lower and 4 mm further back, relative to the bottom bracket. Its wheelbase is 3 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −17 mm
- Lower front end
- Frame reach
- −4 mm
- Shorter frame reach
- Wheelbase
- −3 mm
- Shorter: quicker to change direction
- Head angle
- −0.5°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Aethos Founder's Edition, 54Specialized Tarmac Men's Disc, 52Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Aethos Founder's Edition 54 | Specialized Tarmac Men's Disc 52 | Difference |
|---|---|---|---|
| Reach | 384mm | 380mm | −4 mm |
| Stack | 544mm | 527mm | −17 mm |
| Head tube angle | 73° | 72.5° | −0.5° |
| Seat tube angle | 74° | 74° | ±0.0° |
| Chainstay length | 410mm | 410mm | ±0 mm |
| Wheelbase | 978mm | 975mm | −3 mm |
| BB drop | 72mm | 74mm | +2 mm |
| BB height | 268mm | 266mm | −2 mm |
| Standover | 748mm | 755mm | +7 mm |
| Seat tube length | 481mm | 462mm | −19 mm |
| Fork length | 369mm | 363mm | −6 mm |
| Head tube length | 137mm | 126mm | −11 mm |
| Effective top tube | not listed | 531mm |
Differences are the Specialized Tarmac Men's Disc minus the Specialized Aethos Founder's Edition. Full charts: 2021 Specialized Aethos Founder's Edition, 2019 Specialized Tarmac Men's Disc.
Where each sits in its class
Specialized Aethos Founder's EditionSpecialized Tarmac Men's Disc
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 Men's DiscMen's S-Works Disc |
|---|---|---|
| Frame | Specialized S-Works Aethos FACT | not listed |
| Shifter | SRAM Red eTap AXS | Shimano Dura-Ace Di2 |
| Derailleur | SRAM RED eTAP AXS | Shimano Dura-Ace R9150 Di2 |
| Cassette | SRAM Red eTap | Shimano Dura-Ace R9100 |
| Chain | SRAM Red | Shimano Dura-Ace |
| Crankset | SRAM RED AXS Power Meter | Specialized S-Works Power |
| Bottom bracket | CeramicSpeed SRAM DUB | not listed |
| Wheelset | Roval Alpinist CLX | Roval CLX 50 |
| Tire | Specialized Turbo Cotton | Specialized Turbo Cotton |
| Brake | Shimano 105 | Shimano Dura-Ace R9170 |
| Handlebar | Roval Alpinist Cockpit | not listed |
| Seatpost | Roval Alpinist | not listed |
| Saddle | Specialized S-Works Romin Evo | Specialized S-Works Toupe |
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