2024 Specialized Tarmac SL8 Expert vs 2026 Trek Madone SLR Gen 8
The XL is the Trek Madone SLR Gen 8 size closest to your 58 Specialized Tarmac SL8 Expert. 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 SL8 Expert in 58, the Trek Madone SLR Gen 8 in XL places the top of the head tube 11 mm higher and about as far forward, relative to the bottom bracket.
- Frame stack
- +11 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
- +2 mm
- About the same
The two frames
Only the Specialized Tarmac SL8 Expert is drawn. The Trek Madone SLR Gen 8 numbers we have for size XL are missing the seat angle.
Geometry side by side
| Measurement | Specialized Tarmac SL8 Expert 58 | Trek Madone SLR Gen 8 XL | Difference |
|---|---|---|---|
| Reach | 400mm | 402 | +2 mm |
| Stack | 599mm | 610 | +11 mm |
| Head tube angle | 73.5° | 73.9° | +0.4° |
| Seat tube angle | 73.5° | not listed | |
| Chainstay length | 410mm | 412 | +2 mm |
| Wheelbase | 1006mm | 1007 | +1 mm |
| BB drop | 72mm | 68 | −4 mm |
| BB height | 268mm | not listed | |
| Standover | 808mm | 863 | +55 mm |
| Seat tube length | 515mm | 609 | +94 mm |
| Fork length | 370mm | not listed | |
| Head tube length | 184mm | 201 | +17 mm |
| Effective top tube | not listed | 584 |
Differences are the Trek Madone SLR Gen 8 minus the Specialized Tarmac SL8 Expert. Full charts: 2024 Specialized Tarmac SL8 Expert, 2026 Trek Madone SLR Gen 8.
Where each sits in its class
Specialized Tarmac SL8 ExpertTrek 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 SL8 ExpertExpert | Trek Madone SLR Gen 8SLR 7 AXS Gen 8 |
|---|---|---|
| Frame | Specialized Tarmac SL8 | not listed |
| Shifter | SRAM eTap AXS Rival | not listed |
| Derailleur | SRAM eTap AXS Rival | not listed |
| Cassette | SRAM Rival | not listed |
| Chain | SRAM Rival | not listed |
| Crankset | SRAM Rival | not listed |
| Bottom bracket | SRAM DUB | not listed |
| Wheelset | Roval C38 | Bontrager Aeolus Pro 51 |
| Tire | Specialized Turbo | Pirelli P Zero |
| Brake | SRAM eTap AXS Rival | not listed |
| Handlebar | Specialized Shallow Drop | Trek RSL |
| Stem | Tarmac integrated | not listed |
| Bar tape | Supacaz Super Sticky Kush | not listed |
| Seatpost | Specialized S-Works Tarmac SL8 | not listed |
| Saddle | Specialized Power | not listed |
| Fork | not listed | Trek Madone Gen 8 one-piece |
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