2015 Specialized Roubaix SL4 Double vs 2016 Kona Private Jake
The ML is the Kona Private Jake size closest to your 56 Specialized Roubaix SL4 Double. 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 Double 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 Double, 56Kona Private Jake, MLDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Roubaix SL4 Double 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 Double. Full charts: 2015 Specialized Roubaix SL4 Double, 2016 Kona Private Jake.
Where each sits in its class
Specialized Roubaix SL4 DoubleKona 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 DoubleSL4 Double | Kona Private JakePrivate Jake |
|---|---|---|
| Frame | Specialized SL4 FACT | Kona Race Light 7005 Aluminum Butted |
| Shifter | Shimano Sora | SRAM Rival One |
| Derailleur | Shimano Sora | SRAM Rival One |
| Cassette | Shimano HG50 | SRAM Rival 11-32t 11spd |
| Chain | KMC X9 | KMC X11 |
| Crankset | Shimano Sora | SRAM Rival One PF30 |
| Wheelset | Specialized AXIS 1.0 | Novatec 30 Disc |
| Tire | Specialized Espoir Elite | WTB Cross Boss 700x35c |
| Brake | Specialized Axis 1.0 | Tektro Spyre |
| Seatpost | Specialized CG-R | not listed |
| Saddle | Specialized Toupé Sport | WTB SL8 |
| Fork | not listed | Kona Full Carbon CX Race Disc |
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