2017 Specialized Roubaix SL4 Comp vs 2019 Specialized Allez Sport
The 58 is the Specialized Allez Sport size closest to your 58 Specialized Roubaix SL4 Comp. 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 Specialized Allez Sport
Compared with the Specialized Roubaix SL4 Comp in 58, the Specialized Allez Sport in 58 places the top of the head tube 5 mm higher and about as far forward, relative to the bottom bracket. Its wheelbase is 18 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +5 mm
- Higher front end
- Frame reach
- −2 mm
- About the same reach
- Wheelbase
- −18 mm
- Shorter: quicker to change direction
- Head angle
- +1.0°
- Steeper: sharper steering
- Chainstays
- −3 mm
- Shorter: livelier
The two frames
Specialized Roubaix SL4 Comp, 58Specialized Allez Sport, 58Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Roubaix SL4 Comp 58 | Specialized Allez Sport 58 | Difference |
|---|---|---|---|
| Reach | 392mm | 390mm | −2 mm |
| Stack | 622mm | 627mm | +5 mm |
| Head tube angle | 72.5° | 73.5° | +1.0° |
| Seat tube angle | 73° | 73.25° | +0.3° |
| Effective top tube | 582mm | 579mm | −3 mm |
| Chainstay length | 418mm | 415mm | −3 mm |
| Wheelbase | 1029mm | 1011mm | −18 mm |
| BB drop | 70mm | 74.5mm | +5 mm |
| BB height | 272.5mm | 265.5mm | −7 mm |
| Standover | 829mm | 826mm | −3 mm |
| Seat tube length | 540mm | 550mm | +10 mm |
| Fork length | 368mm | 375mm | +7 mm |
| Head tube length | 225mm | 215mm | −10 mm |
Differences are the Specialized Allez Sport minus the Specialized Roubaix SL4 Comp. Full charts: 2017 Specialized Roubaix SL4 Comp, 2019 Specialized Allez Sport.
Where each sits in its class
Specialized Roubaix SL4 CompSpecialized Allez Sport
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 CompSL4 Comp Di2 | Specialized Allez SportSport |
|---|---|---|
| Frame | Specialized SL4 FACT | not listed |
| Shifter | Shimano Ultegra Di2 | Shimano Sora |
| Derailleur | Shimano Ultegra R6870 Di2, Shimano Ultegra Di2 | Shimano Sora |
| Cassette | Shimano 105 | not listed |
| Chain | KMC X-11 | KMC X9 |
| Crankset | Praxis Zayante | Praxis Alba M30 |
| Wheelset | Specialized AXIS Elite | Specialized Axis Sport |
| Tire | Specialized Turbo Pro | Specialized Espoir Sport |
| Brake | Shimano 105 | Specialized Axis 1.0 |
| Seatpost | Specialized CG-R | not listed |
| Saddle | Specialized Phenom Comp GT | Specialized Toupé Sport |
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