2026 Specialized Tarmac SL8 Comp Shimano vs 2025 Trek Émonda ALR
The 47 is the Trek Émonda ALR size closest to your 44 Specialized Tarmac SL8 Comp 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 Émonda ALR
Compared with the Specialized Tarmac SL8 Comp Shimano in 44, the Trek Émonda ALR in 47 places the top of the head tube 6 mm higher and 7 mm further forward, relative to the bottom bracket.
- Frame stack
- +6 mm
- Higher front end
- Frame reach
- +7 mm
- Longer frame reach
- Wheelbase
- +2 mm
- About the same
- Head angle
- +1.6°
- Steeper: sharper steering
- Chainstays
- ±0 mm
- About the same
The two frames
Only the Specialized Tarmac SL8 Comp Shimano is drawn. The Trek Émonda ALR numbers we have for size 47 are missing the seat angle.
Geometry side by side
| Measurement | Specialized Tarmac SL8 Comp Shimano 44 | Trek Émonda ALR 47 | Difference |
|---|---|---|---|
| Reach | 366mm | 373 | +7 mm |
| Stack | 501mm | 507 | +6 mm |
| Head tube angle | 70.5° | 72.1° | +1.6° |
| Seat tube angle | 75.5° | not listed | |
| Effective top tube | 496mm | 512 | +16 mm |
| Chainstay length | 410mm | 410 | ±0 mm |
| Wheelbase | 970mm | 972 | +2 mm |
| BB drop | 74mm | 72 | −2 mm |
| BB height | 266mm | not listed | |
| Standover | 723mm | 692 | −31 mm |
| Seat tube length | 433mm | 424 | −9 mm |
| Fork length | 370mm | not listed | |
| Head tube length | 99mm | 100 | +1 mm |
Differences are the Trek Émonda ALR minus the Specialized Tarmac SL8 Comp Shimano. Full charts: 2026 Specialized Tarmac SL8 Comp Shimano, 2025 Trek Émonda ALR.
Where each sits in its class
Specialized Tarmac SL8 Comp ShimanoTrek Émonda ALR
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 Comp ShimanoComp - Shimano 105 Di2 | Trek Émonda ALRALR 5 |
|---|---|---|
| Frame | Specialized Tarmac SL8 FACT | not listed |
| Shifter | Shimano 105 R7170 Di2 | not listed |
| Derailleur | Shimano 105 R7170 | not listed |
| Cassette | Shimano 105 R7100 | not listed |
| Chain | Shimano SLX M7100 | not listed |
| Crankset | Shimano 105 R7100 | not listed |
| Wheelset | DT Swiss R470 | Bontrager Paradigm SL |
| Tire | Specialized S-Works Turbo | Bontrager R1 Hard-Case Lite |
| Brake | Shimano 105 | not listed |
| Headset | Specialized SL7 | not listed |
| Seatpost | Specialized S-Works Tarmac SL8 | not listed |
| Saddle | Specialized Power Sport | not listed |
| Fork | not listed | Trek Émonda ALR |
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