2027 Trek Madone SLR Gen 8 vs 2025 Specialized Aethos Pro
The 49 is the Specialized Aethos Pro size closest to your XS Trek Madone SLR Gen 8. 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 Pro
Compared with the Trek Madone SLR Gen 8 in XS, the Specialized Aethos Pro in 49 places the top of the head tube 7 mm higher and 5 mm further forward, relative to the bottom bracket.
- Frame stack
- +7 mm
- Higher front end
- Frame reach
- +5 mm
- Longer frame reach
- Wheelbase
- +2 mm
- About the same
- Head angle
- +0.2°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Madone SLR Gen 8 numbers we have for size XS are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Madone SLR Gen 8 XS | Specialized Aethos Pro 49 | Difference |
|---|---|---|---|
| Reach | 370 | 375mm | +5 mm |
| Stack | 507 | 514mm | +7 mm |
| Head tube angle | 71.6° | 71.75° | +0.2° |
| Effective top tube | 517 | 508mm | −9 mm |
| Chainstay length | 410 | 410mm | ±0 mm |
| Wheelbase | 971 | 973mm | +2 mm |
| BB drop | 72 | 74mm | +2 mm |
| Standover | 704 | 705mm | +1 mm |
| Seat tube length | 404 | 431mm | +27 mm |
| Head tube length | 100 | 109mm | +9 mm |
| Seat tube angle | not listed | 75.5° | |
| BB height | not listed | 266mm | |
| Fork length | not listed | 369mm |
Differences are the Specialized Aethos Pro minus the Trek Madone SLR Gen 8. Full charts: 2027 Trek Madone SLR Gen 8, 2025 Specialized Aethos Pro.
Where each sits in its class
Trek Madone SLR Gen 8Specialized Aethos Pro
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 | Trek Madone SLR Gen 8SLR 7 AXS Gen 8 | Specialized Aethos Pro |
|---|---|---|
| Frame | Trek Madone | not listed |
| Fork | Trek Madone Gen 8 | not listed |
| Shifter | SRAM Force | not listed |
| Derailleur | SRAM Force AXS | not listed |
| Cassette | SRAM Force XG-1270 | not listed |
| Chain | SRAM E1 Force | not listed |
| Crankset | SRAM Force AXS | not listed |
| Bottom bracket | SRAM DUB | not listed |
| Battery | SRAM eTap | not listed |
| Wheelset | Bontrager Aeolus Pro 51 | not listed |
| Tire | Bontrager Aeolus RSL RD | not listed |
| Brake | SRAM Force AXS | not listed |
| Rotor | SRAM Paceline | not listed |
| Handlebar | Trek Aero RSL Road | not listed |
| Headset | Bontrager Expander Plug | not listed |
| Seatpost | Trek Madone aero | not listed |
| Saddle | Bontrager Aeolus Pro | not listed |
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