2019 Specialized Tarmac Men's Disc vs 2021 Specialized Aethos
The 58 is the Specialized Aethos size closest to your 58 Specialized Tarmac Men's Disc. 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 Men's Disc in 58, the Specialized Aethos in 58 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 Tarmac Men's Disc, 58Specialized Aethos, 58Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Tarmac Men's Disc 58 | Specialized Aethos 58 | Difference |
|---|---|---|---|
| Reach | 402mm | 402mm | ±0 mm |
| Stack | 591mm | 591mm | ±0 mm |
| Head tube angle | 73.5° | 73.5° | ±0.0° |
| Seat tube angle | 73.5° | 73.5° | ±0.0° |
| Effective top tube | 577mm | not listed | |
| Chainstay length | 410mm | 410mm | ±0 mm |
| Wheelbase | 1005mm | 1005mm | ±0 mm |
| BB drop | 72mm | 72mm | ±0 mm |
| BB height | 268mm | 268mm | ±0 mm |
| Standover | 826mm | 796mm | −30 mm |
| Seat tube length | 522mm | 532mm | +10 mm |
| Fork length | 363mm | 369mm | +6 mm |
| Head tube length | 190mm | 184mm | −6 mm |
Differences are the Specialized Aethos minus the Specialized Tarmac Men's Disc. Full charts: 2019 Specialized Tarmac Men's Disc, 2021 Specialized Aethos.
Where each sits in its class
Specialized Tarmac Men's DiscSpecialized 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 Men's DiscMen's S-Works Disc | Specialized AethosAethos Frameset |
|---|---|---|
| Shifter | Shimano Dura-Ace Di2 | not listed |
| Derailleur | Shimano Dura-Ace R9150 Di2 | not listed |
| Cassette | Shimano Dura-Ace R9100 | not listed |
| Chain | Shimano Dura-Ace | not listed |
| Crankset | Specialized S-Works Power | not listed |
| Wheelset | Roval CLX 50 | not listed |
| Tire | Specialized Turbo Cotton | not listed |
| Brake | Shimano Dura-Ace R9170 | not listed |
| Saddle | Specialized S-Works Toupe | not listed |
| Frame | not listed | Specialized Aethos FACT |
| Seatpost | not listed | Roval Alpinist |
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