2019 Specialized Tarmac Men's Disc Sport vs 2021 Specialized Aethos
The 54 is the Specialized Aethos size closest to your 54 Specialized Tarmac Men's Disc Sport. 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 Sport in 54, the Specialized Aethos in 54 places the top of the head tube at about the same height and about as far forward, relative to the bottom bracket. Its wheelbase is 5 mm longer, which can contribute to stability at speed.
- Frame stack
- ±0 mm
- About the same height
- Frame reach
- ±0 mm
- About the same reach
- Wheelbase
- +5 mm
- Longer: steadier at speed
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- +5 mm
- Longer: more planted
The two frames
Specialized Tarmac Men's Disc Sport, 54Specialized Aethos, 54Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Tarmac Men's Disc Sport 54 | Specialized Aethos 54 | Difference |
|---|---|---|---|
| Reach | 384mm | 384mm | ±0 mm |
| Stack | 544mm | 544mm | ±0 mm |
| Head tube angle | 73° | 73° | ±0.0° |
| Seat tube angle | 74° | 74° | ±0.0° |
| Effective top tube | 544mm | not listed | |
| Chainstay length | 405mm | 410mm | +5 mm |
| Wheelbase | 973mm | 978mm | +5 mm |
| BB drop | 72mm | 72mm | ±0 mm |
| BB height | 268mm | 268mm | ±0 mm |
| Standover | 775mm | 748mm | −27 mm |
| Seat tube length | 498mm | 481mm | −17 mm |
| Fork length | 363mm | 369mm | +6 mm |
| Head tube length | 143mm | 137mm | −6 mm |
Differences are the Specialized Aethos minus the Specialized Tarmac Men's Disc Sport. Full charts: 2019 Specialized Tarmac Men's Disc Sport, 2021 Specialized Aethos.
Where each sits in its class
Specialized Tarmac Men's Disc SportSpecialized 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 Disc SportMen's Disc Sport | Specialized AethosAethos Frameset |
|---|---|---|
| Frame | Specialized Tarmac SL6 | Specialized Aethos FACT |
| Shifter | Shimano 105 | not listed |
| Derailleur | Shimano 105 R7000, Shimano 105 R7000 GS | not listed |
| Cassette | Shimano 105 R7000 | not listed |
| Chain | KMC X11 EL | not listed |
| Crankset | Shimano 105 R7000 | not listed |
| Wheelset | DT Swiss R470 | not listed |
| Tire | Specialized Turbo Pro | not listed |
| Brake | Shimano 105 R7070 | not listed |
| Saddle | Specialized Toupé Sport | not listed |
| Seatpost | not listed | Roval Alpinist |
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