2025 Trek Madone SL Gen 8 vs 2026 Specialized Tarmac SL8 Pro Shimano
The 54 is the Specialized Tarmac SL8 Pro Shimano size closest to your M Trek Madone SL 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 Tarmac SL8 Pro Shimano
Compared with the Trek Madone SL Gen 8 in M, the Specialized Tarmac SL8 Pro Shimano 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 3 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −2 mm
- About the same height
- Frame reach
- ±0 mm
- About the same reach
- Wheelbase
- −3 mm
- Shorter: quicker to change direction
- Head angle
- +0.1°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
Trek Madone SL Gen 8, MSpecialized Tarmac SL8 Pro Shimano, 54Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Trek Madone SL Gen 8 M | Specialized Tarmac SL8 Pro Shimano 54 | Difference |
|---|---|---|---|
| Reach | 384 | 384 | ±0 mm |
| Stack | 546 | 544 | −2 mm |
| Head tube angle | 72.90 | 73 | +0.1° |
| Seat tube angle | 73.60 | 74 | +0.4° |
| Effective top tube | 545 | not listed | |
| Chainstay length | 410 | 410 | ±0 mm |
| Wheelbase | 981 | 978 | −3 mm |
| Standover | 762 | not listed | |
| Seat tube length | 476 | not listed | |
| Head tube length | 136 | 137 | +1 mm |
Differences are the Specialized Tarmac SL8 Pro Shimano minus the Trek Madone SL Gen 8. Full charts: 2025 Trek Madone SL Gen 8, 2026 Specialized Tarmac SL8 Pro Shimano.
Where each sits in its class
Trek Madone SL Gen 8Specialized Tarmac SL8 Pro Shimano
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 SL Gen 8SL 5 Gen 8 | Specialized Tarmac SL8 Pro ShimanoPro - Shimano Ultegra Di2 |
|---|---|---|
| Frame | Trek 500 Series OCLV Carbon | Specialized Tarmac SL8 |
| Fork | Trek Madone | Specialized FACT 10r |
| Shifter | Shimano 105 | Shimano Ultegra R8170 |
| Derailleur | Shimano 105 R7100 | Shimano Ultegra R8150 Di2 |
| Cassette | Shimano 105 R7101 | Shimano Ultegra |
| Chain | Shimano SLX M7100 | Shimano XT M8100 |
| Crankset | Shimano 105 R7100 | Shimano Ultegra R81000 |
| Bottom bracket | Praxis T47 | Shimano Threaded BSA |
| Wheelset | Bontrager Paradigm SL | Roval Rapide CL III |
| Tire | Bontrager R1 | Specialized S-Works Turbo |
| Brake | Shimano 105 | Shimano Ultegra R8170 |
| Rotor | Shimano SM-RT70 | Shimano Ultegra R8170 |
| Handlebar | Bontrager Comp | Roval Rapide Cockpit |
| Stem | Trek RCS | Roval Rapide Cockpit |
| Headset | Trek RCS | not listed |
| Seatpost | Trek Madone | Specialized S-Works Tarmac SL8 |
| Saddle | Bontrager Aeolus | Specialized Power Pro |
| Bar tape | not listed | Supacaz Super Sticky Kush |
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