2025 Specialized Tarmac SL8 Pro Shimano vs 2023 Trek Madone SLR
The 47 is the Trek Madone SLR size closest to your 44 Specialized Tarmac SL8 Pro Shimano. 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 Pro Shimano in 44, the Trek Madone SLR in 47 places the top of the head tube 6 mm higher and 7 mm further forward, relative to the bottom bracket.
- Frame stack
- +6 mm
- Higher front end
- Frame reach
- +7 mm
- Longer frame reach
- Wheelbase
- +2 mm
- About the same
- Head angle
- +1.6°
- Steeper: sharper steering
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Tarmac SL8 Pro Shimano, 44Trek Madone SLR, 47Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Tarmac SL8 Pro Shimano 44 | Trek Madone SLR 47 | Difference |
|---|---|---|---|
| Reach | 366mm | 373 | +7 mm |
| Stack | 501mm | 507 | +6 mm |
| Head tube angle | 70.5° | 72.1 | +1.6° |
| Seat tube angle | 75.5° | 74.6 | −0.9° |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 970mm | 972 | +2 mm |
| BB drop | 74mm | 72 | −2 mm |
| BB height | 266mm | not listed | |
| Standover | 723mm | 692 | −31 mm |
| Seat tube length | 433mm | 424 | −9 mm |
| Fork length | 370mm | not listed | |
| Head tube length | 99mm | 100 | +1 mm |
| Effective top tube | not listed | 512 |
Differences are the Trek Madone SLR minus the Specialized Tarmac SL8 Pro Shimano. Full charts: 2025 Specialized Tarmac SL8 Pro Shimano, 2023 Trek Madone SLR.
Where each sits in its class
Specialized Tarmac SL8 Pro ShimanoTrek 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 Pro ShimanoPro - Shimano Ultegra Di2 | Trek Madone SLRSLR 6 |
|---|---|---|
| Frame | Specialized Tarmac SL8 FACT | Trek Madone |
| Shifter | Shimano Ultegra R8170 Di2 | Shimano Ultegra |
| Derailleur | Shimano Ultegra R8150 Di2 | Shimano Ultegra |
| Cassette | Shimano Ultegra | Shimano Ultegra |
| Chain | Shimano Ultegra | Shimano 105 DI2 |
| Crankset | Shimano Ultegra R8100 | Shimano Ultegra Mid Compact |
| Wheelset | Roval Rapide CL II | Bontrager Aeolus Pro 51 |
| Tire | Specialized S-Works Turbo | Bontrager R3 Hard-Case Lite |
| Brake | Shimano Ultegra R8170 Di2 | Shimano Ultegra |
| Handlebar | Roval Rapide Cockpit | Trek Madone Integrated |
| Seatpost | Specialized S-Works Tarmac SL8 | Trek Madone |
| Saddle | Specialized Power | Bontrager Aeolus Elite |
| Fork | not listed | Trek Madone KVF |
| Chainring | not listed | Shimano Ultegra |
| Bottom bracket | not listed | Trek T47 |
| Rotor | not listed | Shimano Ultegra |
| Stem | not listed | Trek Madone aero |
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