2015 Specialized Roubaix SL4 Expert vs 2016 Kona Private Jake
The M is the Kona Private Jake size closest to your 54 Specialized Roubaix SL4 Expert. 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 in 54, the Kona Private Jake in M places the top of the head tube 3 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
- −3 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, 54Kona Private Jake, MDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Roubaix SL4 Expert 54 | Kona Private Jake M | Difference |
|---|---|---|---|
| Reach | 380mm | 384 | +4 mm |
| Stack | 563mm | 560 | −3 mm |
| Head tube angle | 72° | 70.5 | −1.5° |
| Seat tube angle | 73.5° | 74 | +0.5° |
| Effective top tube | 548mm | 545 | −3 mm |
| Chainstay length | 415mm | 420 | +5 mm |
| Wheelbase | 1000mm | 1020 | +20 mm |
| BB drop | 71.5mm | 70 | −2 mm |
| Standover | 776mm | 770 | −6 mm |
| Seat tube length | 495mm | 510 | +15 mm |
| Head tube length | 165mm | 140 | −25 mm |
| Fork length | not listed | 395 |
Differences are the Kona Private Jake minus the Specialized Roubaix SL4 Expert. Full charts: 2015 Specialized Roubaix SL4 Expert, 2016 Kona Private Jake.
Where each sits in its class
Specialized Roubaix SL4 ExpertKona 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 ExpertSL4 Expert | Kona Private JakePrivate Jake |
|---|---|---|
| Frame | Specialized SL4 FACT | Kona Race Light 7005 Aluminum Butted |
| Shifter | Shimano Ultegra | SRAM Rival One |
| Derailleur | Shimano Ultegra | SRAM Rival One |
| Cassette | Shimano Ultegra | SRAM Rival 11-32t 11spd |
| Chain | Shimano Ultegra | KMC X11 |
| Wheelset | Fulcrum S4 | Novatec 30 Disc |
| Tire | Specialized Turbo Pro | WTB Cross Boss 700x35c |
| Brake | Shimano Ultegra | Tektro Spyre |
| Seatpost | Specialized CG-R | not listed |
| Saddle | Specialized Toupe Expert | WTB SL8 |
| Fork | not listed | Kona Full Carbon CX Race Disc |
| Crankset | not listed | SRAM Rival One PF30 |
Know what is on every bike.
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