2025 Trek Madone SL Gen 8 Frameset 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 Frameset. 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 Frameset 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
We can't draw these frames yet. The Trek Madone SL Gen 8 Frameset numbers we have for size M are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Madone SL Gen 8 Frameset M | Specialized Tarmac SL8 Pro Shimano 54 | Difference |
|---|---|---|---|
| Reach | 384 | 384 | ±0 mm |
| Stack | 546 | 544 | −2 mm |
| Head tube angle | 72.9° | 73 | +0.1° |
| Effective top tube | 545 | not listed | |
| Chainstay length | 410 | 410 | ±0 mm |
| Wheelbase | 981 | 978 | −3 mm |
| BB drop | 70 | not listed | |
| Standover | 762 | not listed | |
| Seat tube length | 476 | not listed | |
| Head tube length | 136 | 137 | +1 mm |
| Seat tube angle | not listed | 74 |
Differences are the Specialized Tarmac SL8 Pro Shimano minus the Trek Madone SL Gen 8 Frameset. Full charts: 2025 Trek Madone SL Gen 8 Frameset, 2026 Specialized Tarmac SL8 Pro Shimano.
Where each sits in its class
Trek Madone SL Gen 8 FramesetSpecialized 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 8 FramesetSL Gen 8 Frameset | Specialized Tarmac SL8 Pro ShimanoPro - Shimano Ultegra Di2 |
|---|---|---|
| Fork | Trek Madone Gen 8 | Specialized FACT 10r |
| Frame | not listed | Specialized Tarmac SL8 |
| Shifter | not listed | Shimano Ultegra R8170 |
| Derailleur | not listed | Shimano Ultegra R8150 Di2 |
| Cassette | not listed | Shimano Ultegra |
| Chain | not listed | Shimano XT M8100 |
| Crankset | not listed | Shimano Ultegra R81000 |
| Bottom bracket | not listed | Shimano Threaded BSA |
| Wheelset | not listed | Roval Rapide CL III |
| Tire | not listed | Specialized S-Works Turbo |
| Brake | not listed | Shimano Ultegra R8170 |
| Rotor | not listed | Shimano Ultegra R8170 |
| Handlebar | not listed | Roval Rapide Cockpit |
| Stem | not listed | Roval Rapide Cockpit |
| Bar tape | not listed | Supacaz Super Sticky Kush |
| Seatpost | not listed | Specialized S-Works Tarmac SL8 |
| Saddle | not listed | Specialized Power Pro |
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