2027 Trek Madone SL Gen 8 vs 2026 Specialized Tarmac SL8 Pro Shimano
The 61 is the Specialized Tarmac SL8 Pro Shimano size closest to your XL 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 XL, the Specialized Tarmac SL8 Pro Shimano in 61 places the top of the head tube at about the same height and 6 mm further forward, relative to the bottom bracket.
- Frame stack
- +2 mm
- About the same height
- Frame reach
- +6 mm
- Longer frame reach
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- +0.1°
- About the same head angle
- Chainstays
- −2 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Madone SL Gen 8 numbers we have for size XL are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Madone SL Gen 8 XL | Specialized Tarmac SL8 Pro Shimano 61 | Difference |
|---|---|---|---|
| Reach | 402 | 408 | +6 mm |
| Stack | 610 | 612 | +2 mm |
| Head tube angle | 73.9° | 74 | +0.1° |
| Effective top tube | 584 | not listed | |
| Chainstay length | 412 | 410 | −2 mm |
| Wheelbase | 1007 | not listed | |
| BB drop | 68 | not listed | |
| Standover | 863 | not listed | |
| Seat tube length | 609 | not listed | |
| Head tube length | 201 | 204 | +3 mm |
| Seat tube angle | not listed | 73 |
Differences are the Specialized Tarmac SL8 Pro Shimano minus the Trek Madone SL Gen 8. Full charts: 2027 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 6 AXS Gen 8 | Specialized Tarmac SL8 Pro ShimanoPro - Shimano Ultegra Di2 |
|---|---|---|
| Fork | Trek Madone Gen 8 | Specialized FACT 10r |
| Shifter | SRAM Rival AXS E1 | Shimano Ultegra R8170 |
| Derailleur | SRAM Rival AXS | Shimano Ultegra R8150 Di2 |
| Cassette | SRAM XG1250 | Shimano Ultegra |
| Crankset | SRAM Rival AXS | Shimano Ultegra R81000 |
| Bottom bracket | SRAM DUB | Shimano Threaded BSA |
| Wheelset | Bontrager Aeolus Elite 50 | Roval Rapide CL III |
| Tire | Bontrager Aeolus Pro | Specialized S-Works Turbo |
| Rotor | SRAM Paceline | Shimano Ultegra R8170 |
| Stem | Trek RCS | Roval Rapide Cockpit |
| Seatpost | Trek Madone | Specialized S-Works Tarmac SL8 |
| Saddle | Bontrager Aeolus Elite | Specialized Power Pro |
| Frame | not listed | Specialized Tarmac SL8 |
| Chain | not listed | Shimano XT M8100 |
| Brake | not listed | Shimano Ultegra R8170 |
| Handlebar | not listed | Roval Rapide Cockpit |
| Bar tape | not listed | Supacaz Super Sticky Kush |
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