2027 Trek Madone SLR Gen 8 First ICON vs 2025 Specialized Aethos Pro
The 49 is the Specialized Aethos Pro size closest to your XS Trek Madone SLR Gen 8 First ICON. 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 First ICON 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 First ICON 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 First ICON 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 First ICON. Full charts: 2027 Trek Madone SLR Gen 8 First ICON, 2025 Specialized Aethos Pro.
Where each sits in its class
Trek Madone SLR Gen 8 First ICONSpecialized 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 8 First ICONSLR 9 AXS Gen 8 - The First 50 ICON | Specialized Aethos Pro |
|---|---|---|
| Fork | Trek Madone Gen 8 one-piece | not listed |
| Shifter | SRAM RED AXS E1 | not listed |
| Derailleur | SRAM RED AXS E1 | not listed |
| Cassette | SRAM RED XG-1290 E1 | not listed |
| Chain | SRAM Red E1 | not listed |
| Crankset | SRAM RED AXS E1 | not listed |
| Bottom bracket | SRAM DUB | not listed |
| Battery | SRAM AXS | not listed |
| Wheelset | Bontrager Aeolus RSL | not listed |
| Tire | Pirelli P Zero | not listed |
| Rotor | SRAM Paceline | not listed |
| Headset | Bontrager Expander Plug | not listed |
| Seatpost | Trek Madone | not listed |
| Saddle | Trek Aeolus RSL | not listed |
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