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Shimano's Ultegra R8170 12-Speed groupset with Di2 shifting and hydraulic disc braking drives the performance and capability of this DeRosa 838 complete bicycle. Developed for endurance road with snappy response, controlled handling, and tremendous ride quality, the 838 is a perfect match for the precision, reliability, and true values built into the Ultegra component range. This bike is an Excel Sports frame-up build, equipped with Deda cockpit components and a smooth riding Reserve 50|50 aero carbon wheelset to ensure efficiency, rolling speed and solid, mid-aero overall stability. Given DeRosa's long frame building heritage in every material commonly used by frame manufacturers, every frameset has a defined aesthetic that tells the story of the materials used and thought process behind the design. The 838 was created with the goal of delivering an accessible price point and more than enough compliant performance to be a true DeRosa. Road cyclists who crave a great balance of ride quality, responsiveness, subtle road bike handling, and positive feel can embrace this Ultegra Di2-equipped 838 with the heart it represents.

Designed to accommodate road tires up to 32mm on modern road rim widths, the disc brake 838 offers a great balance for riders at 30mm. Featuring a 27.2mm round seatpost on the sloping frame design and a carbon fiber blend and lay-up that damp vibration and modest impacts, the 838 delivers a pleasant ride quality, but given the Italian manufacturer's expertise, the vertical compliance does not negatively impact road feel. This is complemented by the frame geometry, which offers a balanced stance and the capability for a semi-aggressive to aggressive riding posture- again favoring the everyday road cyclist. Yet performance lies within as well, and from the front of the bike the 1½" headtube (no taper), tapered steerer, frame-specific headset/stem interface ensure torsional stiffness in the steerer tube and oversized headtube junction. That interface sets the stage for a very sleek forward facing perspective, as well as for a variably oval-esque downtube that widens at the bottom bracket zone for impressive lateral stiffness under pedaling loads, including high-output out-of-the-saddle efforts. The top tube flattens out as it slopes towards the seattube, offering a hint of vertical flex when the frame is under duress.

The rear triangle offers simplicity, with smaller rounded seatstays, and more vertically oval chainstays that are largest at the bottom bracket. The former adds compliance, while the latter ensures the torsional strength at delivers efficient standard cadence efforts and aggressive power surges with equal aplomb. Thru-axles ensure hub and frameset stiffness for greater efficiency with 12/100mm front and 12/142mm rear dropouts. The rear features a stout, replaceable hanger/thru-axle system. Housing and wire routing for electronic and mechanical shifting systems is semi internal, with Full Speed Ahead's SRS-type headset/stem interface, for routing off the bottom of the stem into the headset topcap then routing down into the steerer and through the frameset or fork. An FSA SMR compatible stem is desired for semi/or fully internal cable routing, but most non-integrated stems will work. One note on the geometry and sizing: With this sloping design, a listed size of 52cm fits like a 54cm bike, with a 545mm toptube length. So please note the sizing variance in the Geometry chart.

The 838 may be an "entry-level" carbon offering from DeRosa, but it features a endurance ride quality and performance level associated with higher end bikes. It is a great option for long rides, multi-day pedal fests, and a quick, snappy lunch excursion. With a proper balance of stability and reasonably quick handling, descending is a joy, and the power transfer inherent to the frame design means tackling the next ascent is a challenge accepted, not wished away. If you are looking for a forgiving, everyday road bike with inherent heart, something special, from a brand not everyone else will be riding, your next steed may well proudly feature be this DeRosa 838 Ultegra R8170 Di2 Bicycle.

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  • Accessibly priced, Ultegra 12s Di2 equipped, high quality endurance-oriented road disc bicycle with excellent ride quality, handling, power transfer and compliance on all pavement and hardpack dirt roads
  • Optimized for balanced features and characteristics, not compromises
  • Sleek, full width headtube allows for exceptional torsional strength from the front into the front triangle
  • Carbon fiber blend, tube shapes, and proper construction strike the balance of vertical compliance and power transfer/minimal torsional deflection under any load or effort
  • Pre-preg carbon blend: 34.2% 24t +57.3% 30t +8.5% 40t
  • 1½" headtube to 1⅛" for tapered steerer with included FSA SRS system headset- and requires FSA SMR compatible spacers, stem and bar for semi-to full internal routing options
  • Compatible with Mechanical or Electronic shifting systems
  • Flat Mount Disc Calipers required; 160mm rotor max
  • Bolt-on Thru-Axle spacing: 12/100mm Fork, 12/142mm Frame
  • Tire clearance: 700x32mm
  • Frame Specifications
    • Full carbon, internal routing, 1½" straight headtube for FSA SMR system routing
    • Braze-on Front Derailleur hanger (not removable)
    • Bottom Bracket required: PressFit 86.5x46mm (BB386 EVO)
    • Seatpost Diameter: 27.2 mm round (frame features unified dual seat collar)
  • Fork Specifications
    • Full carbon, svelte, straight leg fork blades, with internal (from within headtube only) disc hydraulic hose routing
    • 1½" to 1⅛" tapered carbon steerer for FSA SMR routing, capable of 4 housing lines or housing/wire combo
  • Groupset: Shimano Ultegra Di2 12-spd R8170/R8150/R8100 (Semi-wireless shifting/hydraulic disc braking)
    • Shift/Brake Levers: R8170 Di2 Dual Control
    • Front/Rear Derailleurs:FD- R8150 Di2, Braze-on / RD-R8150 Di2 (Shadow, Integrated D-Fly/Junction, max 34T large cog)
    • Calipers/Rotors: R8170 FM, RT-MT800 CL 160mm F, 140mm R disc rotors
    • Crankset/BB: R8100 50-34T / Wheels Mfg 386EVO/24mm, ABEC-3
    • Cassette/Chain: CS-R8100, 11-34T / CN-M8100 12spd
    • Di2: Wireless cockpit, SD-300 e-Tube wiring from seatpost battery to FD, RD (RD has LED/adjust, comms and charging port
  • Wheelset: Reserve 50/50mm w/DT350; 52mm profile, 21mm IRW, 28mm ERW, CL Disc, TLR
  • Tires: Vittoria Corsa G2.0 TLR 700x28mm w/tubes
  • Deda/San Marco Cockpit
    • Handlebar/Tape: Zero 100 Alloy / Deda Logo- Black
    • Stem: Zero 100 Alloy, 82°, 31.8mm
    • Seatpost: Zero 100 Alloy, 27.2mm diameter, 12mm Setback
    • Saddle: San Marco Aspide Racing Xsilite Open-Fit, Narrow
  • Note: DeRosa's sizing system lists Effective toptube as a size larger than what the listed frame size indicates
  • Component specifics by size (bar measured outside-to-outside at lever zone)
    • 50cm (527mm ETT) | Bar width: 42cm o-o, Stem length: 90mm, Crank length: 170mm
    • 52cm (545mm ETT), 54cm (565mm ETT) | Bar width: 44cm o-o, Stem length: 100mm, Crank length: 172.5mm
    • 56cm (583mm ETT) | Bar width: 46cm o-o, Stem length: 110mm, Crank length: 175mm
  • Color: Black Matte
  • Weight: tbd
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