2027 Trek Madone SLR Gen 8 vs 2026 Specialized Tarmac SL8 Pro Shimano
The 58 is the Specialized Tarmac SL8 Pro Shimano size closest to your L Trek Madone SLR Gen 8. 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 8 in L, the Specialized Tarmac SL8 Pro Shimano in 58 places the top of the head tube 9 mm higher and 8 mm further forward, relative to the bottom bracket.
- Frame stack
- +9 mm
- Higher front end
- Frame reach
- +8 mm
- Longer frame reach
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- −0.3°
- About the same head angle
- Chainstays
- −1 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Madone SLR Gen 8 numbers we have for size L are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Madone SLR Gen 8 L | Specialized Tarmac SL8 Pro Shimano 58 | Difference |
|---|---|---|---|
| Reach | 394 | 402 | +8 mm |
| Stack | 582 | 591 | +9 mm |
| Head tube angle | 73.8° | 73.5 | −0.3° |
| Effective top tube | 568 | not listed | |
| Chainstay length | 411 | 410 | −1 mm |
| Wheelbase | 990 | not listed | |
| BB drop | 68 | not listed | |
| Standover | 820 | not listed | |
| Seat tube length | 548 | not listed | |
| Head tube length | 172 | 184 | +12 mm |
| Seat tube angle | not listed | 73.5 |
Differences are the Specialized Tarmac SL8 Pro Shimano minus the Trek Madone SLR Gen 8. Full charts: 2027 Trek Madone SLR Gen 8, 2026 Specialized Tarmac SL8 Pro Shimano.
Where each sits in its class
Trek Madone SLR Gen 8Specialized 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 8SLR 7 AXS Gen 8 | Specialized Tarmac SL8 Pro ShimanoPro - Shimano Ultegra Di2 |
|---|---|---|
| Frame | Trek Madone | Specialized Tarmac SL8 |
| Fork | Trek Madone Gen 8 | Specialized FACT 10r |
| Shifter | SRAM Force | Shimano Ultegra R8170 |
| Derailleur | SRAM Force AXS | Shimano Ultegra R8150 Di2 |
| Cassette | SRAM Force XG-1270 | Shimano Ultegra |
| Chain | SRAM E1 Force | Shimano XT M8100 |
| Crankset | SRAM Force AXS | Shimano Ultegra R81000 |
| Bottom bracket | SRAM DUB | Shimano Threaded BSA |
| Battery | SRAM eTap | not listed |
| Wheelset | Bontrager Aeolus Pro 51 | Roval Rapide CL III |
| Tire | Bontrager Aeolus RSL RD | Specialized S-Works Turbo |
| Brake | SRAM Force AXS | Shimano Ultegra R8170 |
| Rotor | SRAM Paceline | Shimano Ultegra R8170 |
| Handlebar | Trek Aero RSL Road | Roval Rapide Cockpit |
| Headset | Bontrager Expander Plug | not listed |
| Seatpost | Trek Madone aero | Specialized S-Works Tarmac SL8 |
| Saddle | Bontrager Aeolus Pro | Specialized Power Pro |
| Stem | not listed | Roval Rapide Cockpit |
| Bar tape | not listed | Supacaz Super Sticky Kush |
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