2015 Specialized Roubaix SL4 vs 2016 Kona Private Jake
The XL is the Kona Private Jake size closest to your 58 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 Kona Private Jake
Compared with the Specialized Roubaix SL4 in 58, the Kona Private Jake in XL places the top of the head tube at about the same height and 8 mm further forward, relative to the bottom bracket. Its wheelbase is 17 mm longer, which can contribute to stability at speed.
- Frame stack
- −2 mm
- About the same height
- Frame reach
- +8 mm
- Longer frame reach
- Wheelbase
- +17 mm
- Longer: steadier at speed
- Head angle
- −1.0°
- Slacker: calmer steering
- Chainstays
- +2 mm
- About the same
The two frames
Specialized Roubaix SL4, 58Kona Private Jake, XLDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Roubaix SL4 58 | Kona Private Jake XL | Difference |
|---|---|---|---|
| Reach | 392mm | 400 | +8 mm |
| Stack | 621mm | 619 | −2 mm |
| Head tube angle | 72.5° | 71.5 | −1.0° |
| Seat tube angle | 73° | 72.5 | −0.5° |
| Effective top tube | 582mm | 595 | +13 mm |
| Chainstay length | 418mm | 420 | +2 mm |
| Wheelbase | 1029mm | 1046 | +17 mm |
| BB drop | 70mm | 67.5 | −3 mm |
| Standover | 829mm | 845 | +16 mm |
| Seat tube length | 540mm | 590 | +50 mm |
| Head tube length | 225mm | 200 | −25 mm |
| Fork length | not listed | 395 |
Differences are the Kona Private Jake minus the Specialized Roubaix SL4. Full charts: 2015 Specialized Roubaix SL4, 2016 Kona Private Jake.
Where each sits in its class
Specialized Roubaix SL4Kona 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 SL4S-Works SL4 | Kona Private JakePrivate Jake |
|---|---|---|
| Frame | Specialized S-Works SL4 FACT | Kona Race Light 7005 Aluminum Butted |
| 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 |
| Wheelset | not listed | Novatec 30 Disc |
| Tire | not listed | WTB Cross Boss 700x35c |
| Brake | not listed | Tektro Spyre |
| Saddle | not listed | WTB SL8 |
Know what is on every bike.
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