2025 Specialized Tarmac SL8 LTD Forward Collection vs 2023 Trek Madone SLR
The 56 is the Trek Madone SLR size closest to your 56 Specialized Tarmac SL8 LTD Forward Collection. 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 LTD Forward Collection in 56, the Trek Madone SLR in 56 places the top of the head tube at about the same height and 4 mm further back, relative to the bottom bracket. Its wheelbase is 8 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −2 mm
- About the same height
- Frame reach
- −4 mm
- Shorter frame reach
- Wheelbase
- −8 mm
- Shorter: quicker to change direction
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Tarmac SL8 LTD Forward Collection, 56Trek Madone SLR, 56Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Tarmac SL8 LTD Forward Collection 56 | Trek Madone SLR 56 | Difference |
|---|---|---|---|
| Reach | 395mm | 391 | −4 mm |
| Stack | 565mm | 563 | −2 mm |
| Head tube angle | 73.5° | 73.5 | ±0.0° |
| Seat tube angle | 73.5° | 73.7 | +0.2° |
| Effective top tube | 563mm | 559 | −4 mm |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 991mm | 983 | −8 mm |
| BB drop | 72mm | 70 | −2 mm |
| BB height | 268mm | not listed | |
| Standover | 786mm | 768 | −18 mm |
| Seat tube length | 494mm | 525 | +31 mm |
| Fork length | 370mm | not listed | |
| Head tube length | 157mm | 151 | −6 mm |
Differences are the Trek Madone SLR minus the Specialized Tarmac SL8 LTD Forward Collection. Full charts: 2025 Specialized Tarmac SL8 LTD Forward Collection, 2023 Trek Madone SLR.
Where each sits in its class
Specialized Tarmac SL8 LTD Forward CollectionTrek 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 LTD Forward CollectionS-Works LTD Forward 50 Collection | Trek Madone SLRSLR 6 |
|---|---|---|
| Frame | Specialized S-Works Tarmac SL8 FACT | Trek Madone |
| Shifter | Shimano Dura-Ace R9270 | Shimano Ultegra |
| Derailleur | Shimano Dura-Ace R9250 | Shimano Ultegra |
| Cassette | Shimano Dura-Ace | Shimano Ultegra |
| Chain | Shimano Dura-Ace | Shimano 105 DI2 |
| Crankset | Shimano Dura-Ace R9200 | Shimano Ultegra Mid Compact |
| Tire | Specialized S-Works Turbo Rapidair 2Br | Bontrager R3 Hard-Case Lite |
| Brake | Shimano Dura-Ace R9270 | Shimano Ultegra |
| Handlebar | Roval Rapide Cockpit | Trek Madone Integrated |
| Stem | Roval Rapide Cockpit | Trek Madone aero |
| Headset | Specialized SLT | not listed |
| Saddle | Specialized S-Works Power | Bontrager Aeolus Elite |
| Fork | not listed | Trek Madone KVF |
| Chainring | not listed | Shimano Ultegra |
| Bottom bracket | not listed | Trek T47 |
| Wheelset | not listed | Bontrager Aeolus Pro 51 |
| Rotor | not listed | Shimano Ultegra |
| Seatpost | not listed | Trek Madone |
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