2021 Specialized Aethos Pro 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 Pro in 54, the Specialized Tarmac Men's Disc 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 Pro, 54Specialized Tarmac Men's Disc, 49Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Aethos Pro 54 | Specialized Tarmac Men's Disc 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 |
| Effective top tube | not listed | 508mm |
Differences are the Specialized Tarmac Men's Disc minus the Specialized Aethos Pro. Full charts: 2021 Specialized Aethos Pro, 2019 Specialized Tarmac Men's Disc.
Where each sits in its class
Specialized Aethos ProSpecialized 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 ProPro | Specialized Tarmac Men's DiscMen's S-Works Disc |
|---|---|---|
| Frame | Specialized Aethos FACT | not listed |
| Derailleur | SRAM Force eTAP AXS | Shimano Dura-Ace R9150 Di2 |
| Cassette | SRAM XG-1270 | Shimano Dura-Ace R9100 |
| Chain | SRAM Force | Shimano Dura-Ace |
| Crankset | SRAM FC Force DUB | Specialized S-Works Power |
| Bottom bracket | SRAM DUB | not listed |
| Wheelset | Roval Alpinist CL | Roval CLX 50 |
| Tire | Specialized S-Works Turbo | Specialized Turbo Cotton |
| Brake | SRAM Force eTAP | Shimano Dura-Ace R9170 |
| Seatpost | Roval Alpinist | not listed |
| Saddle | Specialized Power | Specialized S-Works Toupe |
| Shifter | not listed | Shimano Dura-Ace Di2 |
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