2015 Specialized Roubaix SL4 Disc vs 2016 Kona Private Jake
The ML is the Kona Private Jake size closest to your 56 Specialized Roubaix SL4 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 Disc in 56, the Kona Private Jake in ML places the top of the head tube 8 mm lower and about as far forward, relative to the bottom bracket. Its wheelbase is 12 mm longer, which can contribute to stability at speed.
- Frame stack
- −8 mm
- Lower front end
- Frame reach
- +1 mm
- About the same reach
- Wheelbase
- +12 mm
- Longer: steadier at speed
- Head angle
- −1.0°
- Slacker: calmer steering
- Chainstays
- +5 mm
- Longer: more planted
The two frames
Specialized Roubaix SL4 Disc, 56Kona Private Jake, MLDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Roubaix SL4 Disc 56 | Kona Private Jake ML | Difference |
|---|---|---|---|
| Reach | 387mm | 388 | +1 mm |
| Stack | 589mm | 581 | −8 mm |
| Head tube angle | 72.5° | 71.5 | −1.0° |
| Seat tube angle | 73.25° | 73.5 | +0.3° |
| Effective top tube | 565mm | 560 | −5 mm |
| Chainstay length | 415mm | 420 | +5 mm |
| Wheelbase | 1010mm | 1022 | +12 mm |
| BB drop | 71.5mm | 67.5 | −4 mm |
| Standover | 798mm | 800 | +2 mm |
| Seat tube length | 515mm | 540 | +25 mm |
| Head tube length | 190mm | 160 | −30 mm |
| Fork length | not listed | 395 |
Differences are the Kona Private Jake minus the Specialized Roubaix SL4 Disc. Full charts: 2015 Specialized Roubaix SL4 Disc, 2016 Kona Private Jake.
Where each sits in its class
Specialized Roubaix SL4 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 DiscS-Works SL4 Disc | Kona Private JakePrivate Jake |
|---|---|---|
| Frame | Specialized S-Works SL4 FACT | Kona Race Light 7005 Aluminum Butted |
| Wheelset | Roval Rapide CLX 40 SCS | Novatec 30 Disc |
| Seatpost | Specialized CG-R | not listed |
| Fork | not listed | Kona Full Carbon CX Race Disc |
| Shifter | not listed | SRAM Rival One |
| Derailleur | not listed | SRAM Rival One |
| Cassette | not listed | SRAM Rival 11-32t 11spd |
| Chain | not listed | KMC X11 |
| Crankset | not listed | SRAM Rival One PF30 |
| Tire | not listed | WTB Cross Boss 700x35c |
| Brake | not listed | Tektro Spyre |
| Saddle | not listed | WTB SL8 |
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