2027 Trek Madone SL Gen 8 First Replica vs 2026 Specialized Tarmac SL8 Pro Shimano
The 58 is the Specialized Tarmac SL8 Pro Shimano size closest to your L Trek Madone SL Gen 8 First Replica. 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 First Replica in L, the Specialized Tarmac SL8 Pro Shimano in 58 places the top of the head tube 9 mm higher and 8 mm further forward, relative to the bottom bracket.
- Frame stack
- +9 mm
- Higher front end
- Frame reach
- +8 mm
- Longer frame reach
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- −0.3°
- About the same head angle
- Chainstays
- −1 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Madone SL Gen 8 First Replica numbers we have for size L are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Madone SL Gen 8 First Replica L | Specialized Tarmac SL8 Pro Shimano 58 | Difference |
|---|---|---|---|
| Reach | 394 | 402 | +8 mm |
| Stack | 582 | 591 | +9 mm |
| Head tube angle | 73.8° | 73.5 | −0.3° |
| Effective top tube | 568 | not listed | |
| Chainstay length | 411 | 410 | −1 mm |
| Wheelbase | 990 | not listed | |
| BB drop | 68 | not listed | |
| Standover | 820 | not listed | |
| Seat tube length | 548 | not listed | |
| Head tube length | 172 | 184 | +12 mm |
| Seat tube angle | not listed | 73.5 |
Differences are the Specialized Tarmac SL8 Pro Shimano minus the Trek Madone SL Gen 8 First Replica. Full charts: 2027 Trek Madone SL Gen 8 First Replica, 2026 Specialized Tarmac SL8 Pro Shimano.
Where each sits in its class
Trek Madone SL Gen 8 First ReplicaSpecialized 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 First ReplicaSL 7 Gen 8 - The First 50 Replica | Specialized Tarmac SL8 Pro ShimanoPro - Shimano Ultegra Di2 |
|---|---|---|
| Fork | Trek Madone Gen 8 | Specialized FACT 10r |
| Shifter | Shimano Ultegra R8170 Di2 | Shimano Ultegra R8170 |
| Derailleur | Shimano Ultegra R8150 Di2 | Shimano Ultegra R8150 Di2 |
| Cassette | Shimano Ultegra R8101 | Shimano Ultegra |
| Chain | Shimano XT M8100 Ultegra/XT | Shimano XT M8100 |
| Crankset | Shimano Ultegra R8100 | Shimano Ultegra R81000 |
| Wheelset | Bontrager Aeolus Pro 51 | Roval Rapide CL III |
| Tire | Bontrager Aeolus Pro | Specialized S-Works Turbo |
| Brake | Shimano Ultegra | Shimano Ultegra R8170 |
| Rotor | Shimano CL800 | 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 |
| Bottom bracket | not listed | Shimano Threaded BSA |
| Handlebar | not listed | Roval Rapide Cockpit |
| Bar tape | not listed | Supacaz Super Sticky Kush |
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