2023 Specialized Tarmac SL7 FACT 12r Carbon vs 2025 Trek Madone SLR Gen 8
The M is the Trek Madone SLR Gen 8 size closest to your 54 Specialized Tarmac SL7 FACT 12r Carbon. 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 Gen 8
Compared with the Specialized Tarmac SL7 FACT 12r Carbon in 54, the Trek Madone SLR Gen 8 in M places the top of the head tube 6 mm lower and 3 mm further forward, relative to the bottom bracket. Its wheelbase is 3 mm longer, which can contribute to stability at speed.
- Frame stack
- −6 mm
- Lower front end
- Frame reach
- +3 mm
- Longer frame reach
- Wheelbase
- +3 mm
- Longer: steadier at speed
- Head angle
- −0.1°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
Only the Specialized Tarmac SL7 FACT 12r Carbon is drawn. The Trek Madone SLR Gen 8 numbers we have for size M are missing the seat angle.
Geometry side by side
| Measurement | Specialized Tarmac SL7 FACT 12r Carbon 54 | Trek Madone SLR Gen 8 M | Difference |
|---|---|---|---|
| Reach | 381mm | 384 | +3 mm |
| Stack | 552mm | 546 | −6 mm |
| Head tube angle | 73° | 72.9 | −0.1° |
| Seat tube angle | 74° | not listed | |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 978mm | 981 | +3 mm |
| BB drop | 72mm | 70 | −2 mm |
| BB height | 268mm | not listed | |
| Standover | 768mm | 762 | −6 mm |
| Seat tube length | 475mm | 476 | +1 mm |
| Fork length | 366mm | not listed | |
| Head tube length | 131mm | 136 | +5 mm |
| Effective top tube | not listed | 545 |
Differences are the Trek Madone SLR Gen 8 minus the Specialized Tarmac SL7 FACT 12r Carbon. Full charts: 2023 Specialized Tarmac SL7 FACT 12r Carbon, 2025 Trek Madone SLR Gen 8.
Where each sits in its class
Specialized Tarmac SL7 FACT 12r CarbonTrek Madone SLR Gen 8
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 SL7 FACT 12r CarbonS-Works FACT 12r Carbon | Trek Madone SLR Gen 8SLR 7 Gen 8 |
|---|---|---|
| Frame | Specialized S-Works Tarmac SL7 FACT | not listed |
| Stem | Specialized Tarmac | not listed |
| Fork | not listed | Trek Madone Gen 8 one-piece |
| Wheelset | not listed | Bontrager Aeolus Pro 51 |
| Tire | not listed | Pirelli P Zero |
| Handlebar | not listed | Trek RSL |
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