2025 Specialized Tarmac SL8 Expert vs 2023 Trek Madone SLR
The 50 is the Trek Madone SLR size closest to your 52 Specialized Tarmac SL8 Expert. 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 Tarmac SL8 Expert 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 Tarmac SL8 Expert, 52Trek Madone SLR, 50Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Tarmac SL8 Expert 52 | Trek Madone SLR 50 | Difference |
|---|---|---|---|
| Reach | 380 | 378 | −2 mm |
| Stack | 527 | 521 | −6 mm |
| Head tube angle | 72.5 | 72.1 | −0.4° |
| Seat tube angle | 74 | 74.6 | +0.6° |
| Chainstay length | 410 | 410 | ±0 mm |
| Wheelbase | 975 | 974 | −1 mm |
| BB drop | 75 | 72 | −3 mm |
| BB height | 266 | not listed | |
| Standover | 746 | 711 | −35 mm |
| Seat tube length | 456 | 453 | −3 mm |
| Fork length | 370 | not listed | |
| Head tube length | 120 | 111 | −9 mm |
| Effective top tube | not listed | 521 |
Differences are the Trek Madone SLR minus the Specialized Tarmac SL8 Expert. Full charts: 2025 Specialized Tarmac SL8 Expert, 2023 Trek Madone SLR.
Where each sits in its class
Specialized Tarmac SL8 ExpertTrek 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 Tarmac SL8 ExpertExpert | Trek Madone SLRSLR 6 |
|---|---|---|
| Frame | Specialized Tarmac SL8 FACT | Trek Madone |
| Fork | Specialized FACT 10r Carbon | Trek Madone KVF |
| Shifter | Shimano Ultegra R8170 Di2 | Shimano Ultegra |
| Derailleur | Shimano Ultegra R8150 Di2, Shimano Ultegra R8150 Di2 front | Shimano Ultegra |
| Cassette | Shimano Ultegra | Shimano Ultegra |
| Chain | Shimano Ultegra | Shimano 105 DI2 |
| Crankset | Shimano Ultegra R8100 | Shimano Ultegra Mid Compact |
| Chainring | Shimano Ultegra | Shimano Ultegra |
| Bottom bracket | Shimano Ultegra | Trek T47 |
| Wheelset | Roval C38 | Bontrager Aeolus Pro 51 |
| Tire | Specialized S-Works Turbo | Bontrager R3 Hard-Case Lite |
| Brake | Shimano Ultegra R8170 Di2, Shimano Ultegra R8170 Di2 rear | Shimano Ultegra |
| Rotor | Shimano Ultegra | Shimano Ultegra |
| Handlebar | Specialized Expert Shallow Drop | Trek Madone Integrated |
| Stem | Specialized Tarmac | Trek Madone aero |
| Bar tape | Supacaz Super Sticky Kush | not listed |
| Headset | Integrated | not listed |
| Seatpost | Specialized S-Works Tarmac SL8 | Trek Madone |
| Saddle | Specialized Power Expert | Bontrager Aeolus Elite |
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