2017 Specialized Roubaix SL4 vs 2019 Specialized Allez Sport
The 52 is the Specialized Allez Sport size closest to your 52 Specialized Roubaix SL4. 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 in 52, the Specialized Allez Sport in 52 places the top of the head tube 5 mm higher and 3 mm further back, relative to the bottom bracket. Its wheelbase is 12 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +5 mm
- Higher front end
- Frame reach
- −3 mm
- Shorter frame reach
- Wheelbase
- −12 mm
- Shorter: quicker to change direction
- Head angle
- +1.0°
- Steeper: sharper steering
- Chainstays
- +3 mm
- Longer: more planted
The two frames
Specialized Roubaix SL4, 52Specialized Allez Sport, 52Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Roubaix SL4 52 | Specialized Allez Sport 52 | Difference |
|---|---|---|---|
| Reach | 379mm | 376mm | −3 mm |
| Stack | 547mm | 552mm | +5 mm |
| Head tube angle | 72° | 73° | +1.0° |
| Seat tube angle | 74° | 73.25° | −0.8° |
| Effective top tube | 536mm | 542mm | +6 mm |
| Chainstay length | 412mm | 415mm | +3 mm |
| Wheelbase | 990mm | 978mm | −12 mm |
| BB drop | 73mm | 77mm | +4 mm |
| BB height | 269.5mm | 263mm | −7 mm |
| Standover | 756mm | 755mm | −1 mm |
| Seat tube length | 475mm | 490mm | +15 mm |
| Fork length | 368mm | 375mm | +7 mm |
| Head tube length | 145mm | 135mm | −10 mm |
Differences are the Specialized Allez Sport minus the Specialized Roubaix SL4. Full charts: 2017 Specialized Roubaix SL4, 2019 Specialized Allez Sport.
Where each sits in its class
Specialized Roubaix SL4Specialized 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 SL4SL4 | Specialized Allez SportSport |
|---|---|---|
| Frame | Specialized SL4 FACT | not listed |
| Shifter | Shimano Tiagra | Shimano Sora |
| Derailleur | Shimano Tiagra | Shimano Sora |
| Cassette | Shimano Tiagra | not listed |
| Chain | KMC X-10 | KMC X9 |
| Crankset | Praxis Alba | Praxis Alba M30 |
| Wheelset | Specialized AXIS Elite | Specialized Axis Sport |
| Tire | Specialized Espoir Elite | Specialized Espoir Sport |
| Brake | Specialized Axis 1.0 | Specialized Axis 1.0 |
| Seatpost | Specialized CG-R | not listed |
| Saddle | Specialized Toupé Sport | Specialized Toupé Sport |
Know what is on every bike.
Add your bike to Quiver. Keep its parts, setup, and service history together, then share your build.
Explore the app
