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RIRA - Shimano Ultegra Di2

$10,490.00
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Chapter2 RIRA Complete Bike – Precision Performance, Inspired by the Ride

The Chapter2 RIRA Complete Bike with Shimano Ultegra Di2 is a race-ready machine designed for pure speed, effortless shifting, and precise handling. Whether you’re tackling a fast-paced criterium, a long endurance ride, or an all-out attack on a climb, this build delivers the perfect balance of aerodynamics, stiffness, and comfort to maximize your performance.

Precision Carbon Engineering for Ultimate Efficiency

Built from 100% Toray carbon fiber in Japan, the RIRA frame and fork are engineered to provide explosive power transfer, optimal aerodynamics, and responsive handling. The T47 ceramic bottom bracket enhances efficiency, ensuring that every watt of effort translates to smooth, powerful movement. The fully integrated MANA5 handlebar and stem create a sleek, cable-free cockpit, optimizing airflow while allowing for customized width and length options. Paired with the TUMU carbon seatpost and TCP 3D-printed carbon saddle, the RIRA ensures long-distance comfort while maintaining an aggressive race posture.

Shimano Ultegra Di2 – Pro-Level Performance Without Compromise

The Shimano Ultegra Di2 12-speed groupset brings lightning-fast, wireless shifting and top-tier braking performance, making this build a true high-performance race machine. With compact (50/34) and mid-compact (52/36) crankset options paired with 11-30T or 11-34T cassettes, riders get the versatility to power through flats, attack climbs, and maintain control on technical descents. The Shimano Ultegra hydraulic disc brakes with CL800 rotors (140mm or 160mm) ensure consistent, powerful stopping power in all conditions.

UNAAS HARD2 Carbon Wheels – Aero Meets Stability

To maximize speed and efficiency, the RIRA Complete Bike is equipped with the UNAAS HARD2 50mm carbon wheelset, delivering the perfect balance of lightweight acceleration, aerodynamic performance, and stability in crosswinds. Wrapped in Goodyear Eagle F1 R tires (700x28c or 700x30c, available in black or tan wall), this setup ensures low rolling resistance, exceptional grip, and a smooth, confident ride across all road conditions.

Whether you’re a seasoned racer, an ambitious Gran Fondo rider, or simply someone looking for an ultra-refined road machine, the RIRA Complete Bike with Shimano Ultegra Di2 is built to elevate your ride and deliver top-tier performance every time you hit the road.

Key Specifications

  • Frame & Fork: Chapter2 RIRA Carbon – 100% Made in Japan by Toray
  • Cockpit: MANA5 Integrated Handlebar/Stem (Customizable Length + Width), Chapter2 Black Bar Tape
  • Drivetrain: Shimano Ultegra Di2 12-speed (50/34 or 52/36 Crankset + 11-30 or 11-34 Cassette)
  • Brakes: Shimano Ultegra Di2 Hydraulic Disc, Shimano CL800 Rotors (140mm or 160mm)
  • Wheels: UNAAS HARD2 Carbon Wheelset – 50mm
  • Tyres: Goodyear Eagle F1 R (700x28c or 700x30c) – Black or Tan Wall
  • Bottom Bracket: Wishbone T47 Ceramic Bearings
  • Saddle & Seatpost: TCP 3D Printed Carbon Saddle, Chapter2 TUMU 27.2mm Carbon Seatpost
The RIRA Complete Bike with Shimano Ultegra Di2 delivers a winning combination of cutting-edge technology, lightweight carbon engineering, and premium components, making it the perfect choice for riders who demand the best in speed, control, and efficiency.
BIKE SPECIFICATIONS

FRAME: Chapter2 RIRA Carbon: 100% Made in Japan by Toray
FORK: Chapter2 Carbon: 100% Made in Japan by Toray
HANDLEBAR/STEM: Chapter2 MANA5 Integrated (Choose your length + width)
TAPE: Chapter2 Black Bar Tape
SADDLE: TCP 3D Printed Carbon Saddle
SEATPOST: Chapter2 Carbon TUMU 27.2mm
FRONT BRAKE: Shimano Ultegra Di2
REAR BRAKE: Shimano Ultegra Di2
SHIFT LEVERS: Shimano Ultegra Di2
FRONT DERAILLEUR: Shimano Ultegra Di2
REAR DERAILLEUR: Shimano Ultegra Di2, 12-speed
CHAIN: Shimano Ultegra
CASSETTE: Shimano Ultegra (11-30 or 11-34)
CRANKSET: Shimano Ultegra (165, 170, 172.5 or 175mm), (50/34 or 52/36)
BOTTOM BRACKET: Wishbone T47 Ceramic Bearings
FRONT WHEEL: UNAAS HARD2 Wheelset - 50mm
REAR WHEEL: UNAAS HARD2 Wheelset - 50mm
ROTORS: Shimano Ultegra CL800 (140 or 160mm)
TYRES: Goodyear Eagle F1 R - (700x28c or 700x30x) + (Black or Tan Wall)

ABOUT THE FRAME

In a world where every new bike launch is accompanied by lofty claims of “fastest bike in the world” or “save X watts over a 40km/hr solo ride” etc. it would be easy to forget that cycling is about the senses, the beauty of suffering up a massive col, then dipping into a valley with the surroundings flashing by as if you’re travelling through time.

The RIRA is all about the “touchy, feely” side of cycling. Whilst the svelte weight and the carefully dialled stiffness to weight ratio matters to our product team who geek out over Toray T1100 grade specifications, fibre orientation and watts saved etc., it’s what we deliver to your soul that matters to us most.

With the RIRA, we got back to basics. A razor-sharp focus on balance and agility that is sure to raise your pulse, and if that wasn’t enough, it has the looks that will certainly turn a few heads when you rock up to your local bunchie or put the power down to capture your PB.

The RIRA sports a T47 85.5 BB Standard that is quickly becoming the default standard for high tolerance and stiffness, as well as offering many BB and Crankset options in the market. By using a standard 27.2mm Seatpost, you can really dial in your bike fit as well as target weight. Of course, you can also choose the optional C2 TUMU Seatpost at 219g to get the full C2 experience.

The RIRA frameset comes with Sram UDH Hanger and Shimano Direct Mount Hnager and is only compatible Electronic Groupsets. The chassis and fork accommodate tires up to 32mm in the rear and 34mm in the front, ensuring a smooth and fast ride, so you will have ample room for high volume tires for the fast and plush ride quality.

FEATURES/BENEFITS

The sleek 950g RIRA Form Factor has all the trademarks of a modern race frameset, such as a T47 85.5 BB for added stiffness and maximum BB/Crankset compatibility. The slender waistline of the headtube carefully manages the airflow to minimise drag, creating a slippery silhouette that delivers

Each frameset comes with a Sram UDH Hanger as well as a Shimano Direct Mount Hanger allow maximum shifting performance with both Gruppo Manufacturers.

In a world of bespoke Seatposts, C2 are bucking the trend by engineering the RIRA specifically for the round 27.2 Seatpost so you can select the best post in the market that suits your needs, including the 219g C2 TUMU 0mm Setback post.

TORQUE SPECS
Seatclamp
8-10Nm
Thru-Axle
3-4Nm
Rear Derailleur Hanger
3-4Nm
Water Bottle Cage Bolts
2-3Nm
Thru-Axle
10Nm
MANA
6Nm

CUSTOMISABLE AT NO EXTRA COST

Unlike most bike brands where you are left paying extra for switching out stem length, handle bar width, tyre width, cassettes, chain ring size and crank length we can tailor build the bike to your preferences.

Choose the following preferences:

  • MANA5 handlebar size (available in 12 sizes)
  • Cassette
  • Chainring
  • Crank length
  • Tyre width

MANA5 Aero Bar Innovation

Whilst we have been busy dialling in the ride characteristics of the RIRA, we have also reimagined the cockpit. The MANA which was first launched in 2019 has gone through some subtle tweaks over the years to ensure it continues to deliver a confidence inspiring steering system, including allowing for fully integrated cabling.

With this fifth iteration, we are stoked to present the newly sculpted MANA5, now available in 12 sizes to ensure you get the bike fit that works perfectly with your C2 Frameset. The MANA5 also has up to 25mm of flare each side, giving you that aero optimised position.

Additionally the MANA5 is also backwards compatible with all C2 Integrated and Non-Integrated framesets and because it’s designed for circular 1-1/8” steerer, it also works with most bikes in the market, giving you the ultimate performance upgrade to any bike.

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FEATURES

BIKE FIT OPTIONS - CAN BE USED WITH MANA - OR WITH STANDARD STEM

27.2MM STANDARD SIZE SEATPOST FOR MAXIMUM BIKE FIT OPTIONS

FULLY INTEGRATED CABLING - IMPROVED AERODYNAMICS - CLEAN AND SLEEK AETHETICS

SRAM UDH REAR HANGER COMPATBILITY AND UP TO 32MM TIRE CLEARANCE

T47 85.5 BB WITH SRAM UDH AND SHIMANO DIRECT MOUNT HANGER OPTIONS

ASYMMETRIC SEATTUBE TO MAXIMISE BOTTOM BRACKET STIFFNESS
SIZE GUIDE
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FRAME GEOMETRY

Note:

All dimensions are in mm unless otherwise noted

RIRA XS S M L XL
Stack 489 517 545 573 601
Reach 361 371 381 391 401
A. Top Tube 502 520 538 555 574
B. Head Tube 90 112 135 161 191
C. Seat Tube Angle 74° 74° 74° 74° 74°
D. Head Tube Angle 70° 72° 73° 74° 74°
E. Seat Tube 430 450 470 500 530
F. BB Drop 74 73.5 73 72.5 72
G. Rear Centre 410 410 410 410 410
H. Wheelbase 972 974 975 982 1001
I. Front Centre 574 576 574 584 602
J. Fork Offset 53 53 43 43 43
K. Seatpost Setback NA NA NA NA NA
Stem NA NA NA NA NA
Stand over 721 744 768 799 827
Rider Height <170 165-175 170-180 175-185 >180
Max. Tire Size 32 32 32 32 32
Rear Caliper Mount 25 25 25 25 25

Note: All dimensions are in mm unless otherwise noted.
MANA5
Size 80x405 80x416 90x405 90x416 90x427 100x416 100x427 100x438 110x427 110x438 110x449 120x449
A. Stem 80 80 90 90 90 100 100 100 110 110 110 120
B. Width at Drops 405 416 405 416 427 416 427 438 427 438 449 449
C. Width at Hoods 355 366 355 366 377 366 377 388 377 388 399 399
D. Reach 70 70 70 70 70 70 70 70 70 70 70 70
E. Drop 128 128 128 128 128 128 128 128 128 128 128 128
F. Stem Angle 7.0° 7.0° 7.0° 7.0° 7.0° 7.0° 7.0° 7.0° 7.0° 7.0° 7.0° 7.0°
MANA2
Size 80x380 90x391 100x402 110x413 120x424 130x435
A. Stem 80 90 100 110 120 130
B. Width at Drops 380 391 402 413 424 435
C. Width at Hoods 360 371 382 393 404 415
D. Reach 70 70 70 70 70 70
E. Drop 128 128 128 128 128 128
F. Stem Angle 7.0° 7.0° 7.0° 7.0° 7.0° 7.0°