2015 Specialized Roubaix SL4 Pro Disc Race UDi2 vs 2017 Trek Émonda ALR Pro
The 50 is the Trek Émonda ALR Pro size closest to your 49 Specialized Roubaix SL4 Pro Disc Race UDi2. 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 Pro
Compared with the Specialized Roubaix SL4 Pro Disc Race UDi2 in 49, the Trek Émonda ALR Pro in 50 places the top of the head tube 8 mm higher and 4 mm further back, relative to the bottom bracket. Its wheelbase is 9 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +8 mm
- Higher front end
- Frame reach
- −4 mm
- Shorter frame reach
- Wheelbase
- −9 mm
- Shorter: quicker to change direction
- Head angle
- +0.1°
- About the same head angle
- Chainstays
- −2 mm
- About the same
The two frames
Only the Specialized Roubaix SL4 Pro Disc Race UDi2 is drawn. The Trek Émonda ALR Pro numbers we have for size 50 are missing the seat angle.
Geometry side by side
| Measurement | Specialized Roubaix SL4 Pro Disc Race UDi2 49 | Trek Émonda ALR Pro 50 | Difference |
|---|---|---|---|
| Reach | 378mm | 374 | −4 mm |
| Stack | 527mm | 535 | +8 mm |
| Head tube angle | 72° | 72.1° | +0.1° |
| Seat tube angle | 75.5° | not listed | |
| Effective top tube | 518mm | 521 | +3 mm |
| Chainstay length | 412mm | 410 | −2 mm |
| Wheelbase | 983mm | 974 | −9 mm |
| BB drop | 73mm | 72 | −1 mm |
| Standover | 730mm | 707 | −23 mm |
| Seat tube length | 445mm | 456 | +11 mm |
| Head tube length | 125mm | 130 | +5 mm |
Differences are the Trek Émonda ALR Pro minus the Specialized Roubaix SL4 Pro Disc Race UDi2. Full charts: 2015 Specialized Roubaix SL4 Pro Disc Race UDi2, 2017 Trek Émonda ALR Pro.
Where each sits in its class
Specialized Roubaix SL4 Pro Disc Race UDi2Trek Émonda ALR Pro
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 Roubaix SL4 Pro Disc Race UDi2SL4 Pro Disc Race UDi2 | Trek Émonda ALR ProALR 6 Pro |
|---|---|---|
| Frame | Specialized SL4 FACT | Trek Ultralight 300 |
| Shifter | Shimano 785 Di2 | Shimano Ultegra |
| Derailleur | Shimano Ultegra Di2 | Shimano Ultegra |
| Cassette | Shimano Ultegra | Shimano Ultegra |
| Chain | Shimano Ultegra | not listed |
| Wheelset | Roval Rapide CL 40 SCS | Vision Metron 40 LTD |
| Tire | Specialized Turbo Pro | Bontrager R2 Hard-Case Lite |
| Brake | Shimano 785 | Shimano Ultegra |
| Seatpost | Specialized CG-R | not listed |
| Saddle | Specialized Toupe Expert | Bontrager Montrose |
| Crankset | not listed | Shimano Ultegra |
| Handlebar | not listed | Bontrager VR-C |
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