2021 Specialized Aethos Founder's Edition vs 2023 Trek Madone SLR
The 50 is the Trek Madone SLR size closest to your 52 Specialized Aethos Founder's Edition. 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 Trek Madone SLR
Compared with the Specialized Aethos Founder's Edition in 52, the Trek Madone SLR in 50 places the top of the head tube 6 mm lower and about as far forward, relative to the bottom bracket.
- Frame stack
- −6 mm
- Lower front end
- Frame reach
- −2 mm
- About the same reach
- Wheelbase
- −1 mm
- About the same
- Head angle
- −0.4°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Aethos Founder's Edition, 52Trek Madone SLR, 50Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Aethos Founder's Edition 52 | Trek Madone SLR 50 | Difference |
|---|---|---|---|
| Reach | 380mm | 378 | −2 mm |
| Stack | 527mm | 521 | −6 mm |
| Head tube angle | 72.5° | 72.1 | −0.4° |
| Seat tube angle | 74° | 74.6 | +0.6° |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 975mm | 974 | −1 mm |
| BB drop | 74mm | 72 | −2 mm |
| BB height | 266mm | not listed | |
| Standover | 728mm | 711 | −17 mm |
| Seat tube length | 462mm | 453 | −9 mm |
| Fork length | 369mm | not listed | |
| Head tube length | 120mm | 111 | −9 mm |
| Effective top tube | not listed | 521 |
Differences are the Trek Madone SLR minus the Specialized Aethos Founder's Edition. Full charts: 2021 Specialized Aethos Founder's Edition, 2023 Trek Madone SLR.
Where each sits in its class
Specialized Aethos Founder's EditionTrek Madone SLR
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 Founder's EditionS-Works Founder's Edition | Trek Madone SLRSLR 6 |
|---|---|---|
| Frame | Specialized S-Works Aethos FACT | Trek Madone |
| Shifter | SRAM Red eTap AXS | Shimano Ultegra |
| Derailleur | SRAM RED eTAP AXS | Shimano Ultegra |
| Cassette | SRAM Red eTap | Shimano Ultegra |
| Chain | SRAM Red | Shimano 105 DI2 |
| Crankset | SRAM RED AXS Power Meter | Shimano Ultegra Mid Compact |
| Bottom bracket | CeramicSpeed SRAM DUB | Trek T47 |
| Wheelset | Roval Alpinist CLX | Bontrager Aeolus Pro 51 |
| Tire | Specialized Turbo Cotton | Bontrager R3 Hard-Case Lite |
| Brake | Shimano 105 | Shimano Ultegra |
| Handlebar | Roval Alpinist Cockpit | Trek Madone Integrated |
| Seatpost | Roval Alpinist | Trek Madone |
| Saddle | Specialized S-Works Romin Evo | Bontrager Aeolus Elite |
| Fork | not listed | Trek Madone KVF |
| Chainring | not listed | Shimano Ultegra |
| Rotor | not listed | Shimano Ultegra |
| Stem | not listed | Trek Madone aero |
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