2024 Trek Madone SLR Gen 6 BB90 Rim vs 2026 Specialized Tarmac SL8 Pro Shimano
The 52 is the Specialized Tarmac SL8 Pro Shimano size closest to your 50 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 50, the Specialized Tarmac SL8 Pro Shimano in 52 places the top of the head tube 6 mm higher and about as far forward, relative to the bottom bracket.
- Frame stack
- +6 mm
- Higher front end
- Frame reach
- +2 mm
- About the same reach
- Wheelbase
- +1 mm
- About the same
- Head angle
- +0.4°
- Steeper: sharper steering
- 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 50 are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Madone SLR Gen 6 BB90 Rim 50 | Specialized Tarmac SL8 Pro Shimano 52 | Difference |
|---|---|---|---|
| Reach | 378 | 380 | +2 mm |
| Stack | 521 | 527 | +6 mm |
| Head tube angle | 72.1° | 72.5 | +0.4° |
| Effective top tube | 521 | not listed | |
| Chainstay length | 410 | 410 | ±0 mm |
| Wheelbase | 974 | 975 | +1 mm |
| BB drop | 72 | not listed | |
| Standover | 729 | not listed | |
| Seat tube length | 453 | not listed | |
| Head tube length | 111 | 120 | +9 mm |
| Seat tube angle | not listed | 74 |
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 |
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