2024 Trek Madone SLR Gen 6 BB90 Rim vs 2026 Specialized Tarmac SL8 Pro Shimano
The 56 is the Specialized Tarmac SL8 Pro Shimano size closest to your 56 Trek Madone SLR Gen 6 BB90 Rim. 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 SLR Gen 6 BB90 Rim in 56, the Specialized Tarmac SL8 Pro Shimano in 56 places the top of the head tube at about the same height and 4 mm further forward, relative to the bottom bracket. Its wheelbase is 8 mm longer, which can contribute to stability at speed.
- Frame stack
- +2 mm
- About the same height
- Frame reach
- +4 mm
- Longer frame reach
- Wheelbase
- +8 mm
- Longer: steadier at speed
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- ±0 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Madone SLR Gen 6 BB90 Rim numbers we have for size 56 are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Madone SLR Gen 6 BB90 Rim 56 | Specialized Tarmac SL8 Pro Shimano 56 | Difference |
|---|---|---|---|
| Reach | 391 | 395 | +4 mm |
| Stack | 563 | 565 | +2 mm |
| Head tube angle | 73.5° | 73.5 | ±0.0° |
| Effective top tube | 559 | not listed | |
| Chainstay length | 410 | 410 | ±0 mm |
| Wheelbase | 983 | 991 | +8 mm |
| BB drop | 70 | not listed | |
| Standover | 793 | not listed | |
| Seat tube length | 525 | not listed | |
| Head tube length | 151 | 157 | +6 mm |
| Seat tube angle | not listed | 73.5 |
Differences are the Specialized Tarmac SL8 Pro Shimano minus the Trek Madone SLR Gen 6 BB90 Rim. Full charts: 2024 Trek Madone SLR Gen 6 BB90 Rim, 2026 Specialized Tarmac SL8 Pro Shimano.
Where each sits in its class
Trek Madone SLR Gen 6 BB90 RimSpecialized 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 SLR Gen 6 BB90 RimSLR Gen 6 BB90 Rim | Specialized Tarmac SL8 Pro ShimanoPro - Shimano Ultegra Di2 |
|---|---|---|
| Fork | Trek Madone KVF | Specialized FACT 10r |
| Derailleur | Trek derailleurs must have | Shimano Ultegra R8150 Di2 |
| Bottom bracket | Trek BB90 | Shimano Threaded BSA |
| Brake | Trek Not | Shimano Ultegra R8170 |
| Seatpost | Trek Not | Specialized S-Works Tarmac SL8 |
| Frame | not listed | Specialized Tarmac SL8 |
| Shifter | not listed | Shimano Ultegra R8170 |
| Cassette | not listed | Shimano Ultegra |
| Chain | not listed | Shimano XT M8100 |
| Crankset | not listed | Shimano Ultegra R81000 |
| Wheelset | not listed | Roval Rapide CL III |
| Tire | not listed | Specialized S-Works Turbo |
| Rotor | not listed | Shimano Ultegra R8170 |
| Handlebar | not listed | Roval Rapide Cockpit |
| Stem | not listed | Roval Rapide Cockpit |
| Bar tape | not listed | Supacaz Super Sticky Kush |
| Saddle | not listed | Specialized Power Pro |
Know what is on every bike.
Add your bike to Quiver. Keep its parts, setup, and service history together, then share your build.
Explore the app
