2023 Trek Madone SL Disc Gen 6 vs 2025 Specialized Tarmac SL8 LTD
We can't match sizes for these two: one of them has no stack and reach for the sizes shown.
What changes on the Specialized Tarmac SL8 LTD
- Frame stack
- n/a
- One of the bikes has no number for this
- Frame reach
- +33 mm
- Longer frame reach
- Wheelbase
- +41 mm
- Longer: steadier at speed
- Head angle
- +1.9°
- Steeper: sharper steering
- Chainstays
- ±0 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Madone SL Disc Gen 6 numbers we have for size 47 are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Madone SL Disc Gen 6 47 | Specialized Tarmac SL8 LTD 61 | Difference |
|---|---|---|---|
| Reach | 373 | 406mm | +33 mm |
| Stack | 507 | not listed | |
| Head tube angle | 72.1° | 74° | +1.9° |
| Effective top tube | 512 | 595mm | +83 mm |
| Chainstay length | 410 | 410mm | ±0 mm |
| Wheelbase | 972 | 1013mm | +41 mm |
| BB drop | 72 | 72mm | ±0 mm |
| Standover | 692 | 834mm | +142 mm |
| Seat tube length | 424 | 545mm | +121 mm |
| Head tube length | 100 | 204mm | +104 mm |
| Seat tube angle | not listed | 73° | |
| BB height | not listed | 268mm | |
| Fork length | not listed | 370mm |
Differences are the Specialized Tarmac SL8 LTD minus the Trek Madone SL Disc Gen 6. Full charts: 2023 Trek Madone SL Disc Gen 6, 2025 Specialized Tarmac SL8 LTD.
Where each sits in its class
Trek Madone SL Disc Gen 6Specialized Tarmac SL8 LTD
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 SL Disc Gen 6SL Disc Gen 6 | Specialized Tarmac SL8 LTDS-Works LTD |
|---|---|---|
| Frame | Trek OCLV | Specialized S-Works Tarmac SL8 FACT |
| Fork | Trek Madone KVF | not listed |
| Derailleur | Trek derailleurs must have | SRAM Red AXS |
| Shifter | not listed | SRAM RED AXS |
| Cassette | not listed | SRAM RED XG-1290 |
| Chain | not listed | SRAM RED |
| Crankset | not listed | SRAM RED AXS Power Meter |
| Bottom bracket | not listed | SRAM DUB |
| Wheelset | not listed | Roval Rapide CLX II |
| Tire | not listed | Specialized S-Works Turbo Rapidair 2Br |
| Brake | not listed | SRAM Red AXS |
| Handlebar | not listed | Roval Rapide Cockpit |
| Stem | not listed | Roval Rapide Cockpit |
| Saddle | not listed | Specialized S-Works Power |
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