2021 Specialized Aethos Founder's Edition vs 2019 Specialized Tarmac Men's Disc
The 49 is the Specialized Tarmac Men's Disc size closest to your 49 Specialized Aethos Founder's Edition. 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 Tarmac Men's Disc
Compared with the Specialized Aethos Founder's Edition in 49, the Specialized Tarmac Men's Disc in 49 places the top of the head tube at about the same height and about as far forward, relative to the bottom bracket.
- Frame stack
- ±0 mm
- About the same height
- Frame reach
- ±0 mm
- About the same reach
- Wheelbase
- ±0 mm
- About the same
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Aethos Founder's Edition, 49Specialized Tarmac Men's Disc, 49Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Aethos Founder's Edition 49 | Specialized Tarmac Men's Disc 49 | Difference |
|---|---|---|---|
| Reach | 375mm | 375mm | ±0 mm |
| Stack | 514mm | 514mm | ±0 mm |
| Head tube angle | 71.75° | 71.75° | ±0.0° |
| Seat tube angle | 75.5° | 75.5° | ±0.0° |
| Chainstay length | 410mm | 410mm | ±0 mm |
| Wheelbase | 973mm | 973mm | ±0 mm |
| BB drop | 74mm | 74mm | ±0 mm |
| BB height | 266mm | 266mm | ±0 mm |
| Standover | 705mm | 740mm | +35 mm |
| Seat tube length | 431mm | 431mm | ±0 mm |
| Fork length | 369mm | 363mm | −6 mm |
| Head tube length | 109mm | 115mm | +6 mm |
| Effective top tube | not listed | 508mm |
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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