2023 Specialized Tarmac SL7 Shimano vs 2025 Trek Madone SLR Gen 8
The S is the Trek Madone SLR Gen 8 size closest to your 49 Specialized Tarmac SL7 Shimano. 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 SL7 Shimano in 49, the Trek Madone SLR Gen 8 in S places the top of the head tube 8 mm higher and 6 mm further forward, relative to the bottom bracket. Its wheelbase is 3 mm longer, which can contribute to stability at speed.
- Frame stack
- +8 mm
- Higher front end
- Frame reach
- +6 mm
- Longer frame reach
- Wheelbase
- +3 mm
- Longer: steadier at speed
- Head angle
- +0.5°
- Steeper: sharper steering
- Chainstays
- ±0 mm
- About the same
The two frames
Only the Specialized Tarmac SL7 Shimano is drawn. The Trek Madone SLR Gen 8 numbers we have for size S are missing the seat angle.
Geometry side by side
| Measurement | Specialized Tarmac SL7 Shimano 49 | Trek Madone SLR Gen 8 S | Difference |
|---|---|---|---|
| Reach | 372mm | 378 | +6 mm |
| Stack | 522mm | 530 | +8 mm |
| Head tube angle | 71.75° | 72.2 | +0.5° |
| Seat tube angle | 75.5° | not listed | |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 973mm | 976 | +3 mm |
| BB drop | 74mm | 72 | −2 mm |
| BB height | 266mm | not listed | |
| Standover | 735mm | 734 | −1 mm |
| Seat tube length | 447mm | 440 | −7 mm |
| Fork length | 366mm | not listed | |
| Head tube length | 102mm | 121 | +19 mm |
| Effective top tube | not listed | 532 |
Differences are the Trek Madone SLR Gen 8 minus the Specialized Tarmac SL7 Shimano. Full charts: 2023 Specialized Tarmac SL7 Shimano, 2025 Trek Madone SLR Gen 8.
Where each sits in its class
Specialized Tarmac SL7 ShimanoTrek 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 SL7 ShimanoS-Works - Shimano Dura-Ace Di2 | Trek Madone SLR Gen 8SLR 7 Gen 8 |
|---|---|---|
| Frame | Specialized S-Works Tarmac SL7 FACT | not listed |
| Shifter | Shimano Dura-Ace R9270 | not listed |
| Derailleur | Shimano Dura-Ace R9250 | not listed |
| Cassette | Shimano Dura-Ace | not listed |
| Chain | Shimano XTR M9100 | not listed |
| Crankset | Shimano Dura-Ace R9200 | not listed |
| Bottom bracket | Shimano Dura-Ace | not listed |
| Wheelset | Roval Rapide CLX | Bontrager Aeolus Pro 51 |
| Tire | Specialized S-Works Turbo Rapidair 2Br | Pirelli P Zero |
| Brake | Shimano Dura-Ace | not listed |
| Handlebar | Roval Rapide | Trek RSL |
| Stem | Specialized Tarmac | not listed |
| Saddle | Specialized S-Works Power | not listed |
| Fork | not listed | Trek Madone Gen 8 one-piece |
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