2014 Specialized Roubaix SL4 Expert Disc vs 2016 Kona Private Jake
The M is the Kona Private Jake size closest to your 540.0 Specialized Roubaix SL4 Expert Disc. 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 Kona Private Jake
Compared with the Specialized Roubaix SL4 Expert Disc in 540.0, the Kona Private Jake in M places the top of the head tube 4 mm lower and 4 mm further forward, relative to the bottom bracket. Its wheelbase is 20 mm longer, which can contribute to stability at speed.
- Frame stack
- −4 mm
- Lower front end
- Frame reach
- +4 mm
- Longer frame reach
- Wheelbase
- +20 mm
- Longer: steadier at speed
- Head angle
- −1.5°
- Slacker: calmer steering
- Chainstays
- +5 mm
- Longer: more planted
The two frames
Specialized Roubaix SL4 Expert Disc, 540.0Kona Private Jake, MDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Roubaix SL4 Expert Disc 540.0 | Kona Private Jake M | Difference |
|---|---|---|---|
| Reach | 380mm | 384 | +4 mm |
| Stack | 564mm | 560 | −4 mm |
| Head tube angle | 72° | 70.5 | −1.5° |
| Seat tube angle | 73.5° | 74 | +0.5° |
| Chainstay length | 415mm | 420 | +5 mm |
| Wheelbase | 1000mm | 1020 | +20 mm |
| Standover | 776mm | 770 | −6 mm |
| Seat tube length | 495mm | 510 | +15 mm |
| Head tube length | 165mm | 140 | −25 mm |
| Effective top tube | not listed | 545 | |
| BB drop | not listed | 70 | |
| Fork length | not listed | 395 |
Differences are the Kona Private Jake minus the Specialized Roubaix SL4 Expert Disc. Full charts: 2014 Specialized Roubaix SL4 Expert Disc, 2016 Kona Private Jake.
Where each sits in its class
Specialized Roubaix SL4 Expert DiscKona Private Jake
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 Expert DiscSL4 Expert Ultegra Di2 Disc | Kona Private JakePrivate Jake |
|---|---|---|
| Frame | Specialized SL4 FACT | Kona Race Light 7005 Aluminum Butted |
| Fork | Specialized Roubaix FACT | Kona Full Carbon CX Race Disc |
| Shifter | Shimano Di2 | SRAM Rival One |
| Derailleur | Shimano Ultegra Di2 | SRAM Rival One |
| Cassette | Shimano Ultegra | SRAM Rival 11-32t 11spd |
| Chain | Shimano Ultegra | KMC X11 |
| Crankset | FSA SL-K | SRAM Rival One PF30 |
| Wheelset | Specialized AXIS 4.0 | Novatec 30 Disc |
| Tire | Specialized Roubaix Pro | WTB Cross Boss 700x35c |
| Stem | Specialized Expert Pro-Set | not listed |
| Seatpost | Specialized S-Works CG-R | not listed |
| Saddle | Specialized Romin Expert | WTB SL8 |
| Brake | not listed | Tektro Spyre |
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