2026 Specialized Tarmac SL8 Pro Shimano vs 2025 Trek Émonda ALR
The Trek Émonda ALR size closest to your 54 is the 54. Compare the 54 instead
What changes on the Trek Émonda ALR
Compared with the Specialized Tarmac SL8 Pro Shimano in 54, the Trek Émonda ALR in 58 places the top of the head tube 37 mm higher and 12 mm further forward, relative to the bottom bracket. Its wheelbase is 14 mm longer, which can contribute to stability at speed.
- Frame stack
- +37 mm
- Higher front end
- Frame reach
- +12 mm
- Longer frame reach
- Wheelbase
- +14 mm
- Longer: steadier at speed
- Head angle
- +0.8°
- Steeper: sharper steering
- Chainstays
- +1 mm
- About the same
The two frames
Only the Specialized Tarmac SL8 Pro Shimano is drawn. The Trek Émonda ALR numbers we have for size 58 are missing the seat angle.
Geometry side by side
| Measurement | Specialized Tarmac SL8 Pro Shimano 54 | Trek Émonda ALR 58 | Difference |
|---|---|---|---|
| Reach | 384 | 396 | +12 mm |
| Stack | 544 | 581 | +37 mm |
| Head tube angle | 73 | 73.8° | +0.8° |
| Seat tube angle | 74 | not listed | |
| Chainstay length | 410 | 411 | +1 mm |
| Wheelbase | 978 | 992 | +14 mm |
| Head tube length | 137 | 171 | +34 mm |
| Effective top tube | not listed | 574 | |
| BB drop | not listed | 68 | |
| Standover | not listed | 793 | |
| Seat tube length | not listed | 553 |
Differences are the Trek Émonda ALR minus the Specialized Tarmac SL8 Pro Shimano. Full charts: 2026 Specialized Tarmac SL8 Pro Shimano, 2025 Trek Émonda ALR.
Where each sits in its class
Specialized Tarmac SL8 Pro 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 Pro ShimanoPro - Shimano Ultegra Di2 | Trek Émonda ALRALR 5 |
|---|---|---|
| Frame | Specialized Tarmac SL8 | not listed |
| Fork | Specialized FACT 10r | Trek Émonda ALR |
| Shifter | Shimano Ultegra R8170 | not listed |
| Derailleur | Shimano Ultegra R8150 Di2 | not listed |
| Cassette | Shimano Ultegra | not listed |
| Chain | Shimano XT M8100 | not listed |
| Crankset | Shimano Ultegra R81000 | not listed |
| Bottom bracket | Shimano Threaded BSA | not listed |
| Wheelset | Roval Rapide CL III | Bontrager Paradigm SL |
| Tire | Specialized S-Works Turbo | Bontrager R1 Hard-Case Lite |
| Brake | Shimano Ultegra R8170 | not listed |
| Rotor | Shimano Ultegra R8170 | not listed |
| Handlebar | Roval Rapide Cockpit | not listed |
| Stem | Roval Rapide Cockpit | not listed |
| Bar tape | Supacaz Super Sticky Kush | not listed |
| Seatpost | Specialized S-Works Tarmac SL8 | not listed |
| Saddle | Specialized Power Pro | not listed |
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