2015 Specialized Roubaix SL4 Comp Disc vs 2016 Kona Private Jake
The S/M is the Kona Private Jake size closest to your 52 Specialized Roubaix SL4 Comp 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 Comp Disc in 52, the Kona Private Jake in S/M places the top of the head tube at about the same height and about as far forward, relative to the bottom bracket. Its wheelbase is 20 mm longer, which can contribute to stability at speed.
- Frame stack
- ±0 mm
- About the same height
- Frame reach
- ±0 mm
- About the same reach
- Wheelbase
- +20 mm
- Longer: steadier at speed
- Head angle
- −1.5°
- Slacker: calmer steering
- Chainstays
- +8 mm
- Longer: more planted
The two frames
Specialized Roubaix SL4 Comp Disc, 52Kona Private Jake, S/MDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Roubaix SL4 Comp Disc 52 | Kona Private Jake S/M | Difference |
|---|---|---|---|
| Reach | 379mm | 379 | ±0 mm |
| Stack | 546mm | 546 | ±0 mm |
| Head tube angle | 72° | 70.5 | −1.5° |
| Seat tube angle | 74° | 74.5 | +0.5° |
| Effective top tube | 537mm | 530 | −7 mm |
| Chainstay length | 412mm | 420 | +8 mm |
| Wheelbase | 989mm | 1009 | +20 mm |
| BB drop | 73mm | 70 | −3 mm |
| Standover | 756mm | 755 | −1 mm |
| Seat tube length | 475mm | 495 | +20 mm |
| Head tube length | 145mm | 125 | −20 mm |
| Fork length | not listed | 395 |
Differences are the Kona Private Jake minus the Specialized Roubaix SL4 Comp Disc. Full charts: 2015 Specialized Roubaix SL4 Comp Disc, 2016 Kona Private Jake.
Where each sits in its class
Specialized Roubaix SL4 Comp 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 Comp DiscSL4 Comp Disc | Kona Private JakePrivate Jake |
|---|---|---|
| Frame | Specialized SL4 FACT | Kona Race Light 7005 Aluminum Butted |
| Shifter | Shimano 685 | SRAM Rival One |
| Derailleur | Shimano Ultegra | SRAM Rival One |
| Cassette | Shimano 105 | SRAM Rival 11-32t 11spd |
| Chain | Shimano 105 | KMC X11 |
| Crankset | Praxis TURN Zayante | SRAM Rival One PF30 |
| Wheelset | Specialized AXIS 4.0 | Novatec 30 Disc |
| Tire | Specialized Turbo Pro | WTB Cross Boss 700x35c |
| Brake | Shimano 785 | Tektro Spyre |
| Seatpost | Specialized CG-R | not listed |
| Saddle | Specialized Toupe Comp | WTB SL8 |
| Fork | not listed | Kona Full Carbon CX Race Disc |
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