Chapter2 Rira Ultra Gold Frameset Side View
Chapter2 Rira Ultra Gold Frameset Front Angled View
Chapter2 Rira Ultra Gold Frameset Cockpit View
Chapter2 Rira Ultra Gold Frameset Toptube
Chapter2 Rira Ultra Gold Frameset Fork
Chatper2 Rira Ultra Gold Complete Bike Rear View Angled
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Chapter2 RIRA Ultra

USD$ 3,449.00
Grand total

The RIRA Ultra’s ultra-light chassis delivers a clear advantage on steep climbs and accelerations, while its race geometry provides precise control on high-speed descents and technical corners. The EVO386 bottom bracket reduces weight yet preserves stiffness for maximum power transfer when it matters.

Clearance for 34 mm front / 32 mm rear tyres lets you run wider, lower-pressure setups for more grip, comfort, and confidence on rough roads. And with SRAM UDH included, 1× Transmission builds are fully supported — giving you a cleaner, quieter, more robust drivetrain for aggressive racing and minimal maintenance

Chapter2 RIRA Ultra

The Chapter2 RIRA Ultra is their flagship race chassis: a superlight 695 g (M) Toray carbon frame, aero-tuned RIRA geometry, and modern standards throughout. Built for electronic-only drivetrains, EVO386 stiffness at the BB, and real-world speed with clearance up to 34 mm front / 32 mm rear tires. Supplied with both SRAM UDH and Shimano Direct-Mount hangers for maximum drivetrain flexibility.

Chapter2 RIRA Ultra — Features & Benefits

  • Featherweight frame: ~695 g (size M) with high-grade Toray layup for race-day acceleration.
  • Aero-tuned RIRA shaping: Surfaces and profiles optimized to reduce drag at typical road yaw.
  • Electronic-only: Di2/eTap/EPS routing for a clean, future-proof build.
  • EVO386 BB platform: Broad shell for power-transfer stiffness and reliable alignment.
  • Disc-only, flat-mount: Confident braking with 12×100 / 12×142 thru-axles.
  • Real-world clearance: Up to 34 mm front / 32 mm rear tires for fast, rough tarmac.
  • Hanger flexibility: Includes SRAM UDH and Shimano DM derailleur hangers.

Chapter2 RIRA Ultra Complete Bike in UD/Gold

Chapter2 RIRA Ultra — Specifications

Frame Specs

  • Material: Toray carbon (high-modulus layup)
  • Frame Weight: ~695 g (M, ±3%)
  • Fork Weight: ~395 g (uncut, ±3%)
  • Bottom Bracket: EVO386 press-fit
  • Seatpost: 27.2 mm round (C2 “Tumu” optional)
  • Brake Mount: Flat-mount disc
  • Axles: 12×100 (F) / 12×142 (R)
  • Tire Clearance: 34 mm (front) / 32 mm (rear)
  • Shifting: Electronic only (Di2 / eTap / EPS)
  • Certifications: EN ISO 4210; UCI-approved

Included with the Frameset

  • Frame & Fork: RIRA Ultra frame and matching fork
  • Hangers: SRAM UDH & Shimano Direct-Mount
  • Headset & Small Parts: headset, spacers, axles, grommets, hardware
  • Seatpost: 27.2 mm round (clamp hardware included)
  • Warranty: Manufacturer warranty (see brand terms)

Torque Specs

  • Saddle Rail: 6 Nm
  • Seatclamp: 8 Nm
  • Stem (Steerer): 6 Nm
  • Stem (Handlebar): 6 Nm
  • Front Derailleur Hanger: 3 Nm
  • Rear Derailleur Hanger: 2 Nm
  • BB Cable Guide Cover: 1 Nm
  • Thru-Axle: 10 Nm
  • Water Bottle Cage Bolts: 3 Nm

Chapter2 RIRA Ultra — Geometry


Chapter2 RIRA Ultra geometry chart
Geometry diagram for reference.

Size XS S M L XL
Stack (mm) 489 517 545 573 601
Reach (mm) 361 371 381 391 401
A Top Tube (mm) 502 520 538 555 574
B Head Tube (mm) 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 (mm) 430 450 470 500 530
F BB Drop (mm) 74 73.5 73 72.5 72
G Rear Centre (mm) 410 410 410 410 410
H Wheelbase (mm) 972 974 975 982 1001
I Front Centre (mm) 574 576 574 584 602
J Fork Offset (mm) 53 53 43 43 43

All dimensions in millimeters unless noted (°).

CHAPTER2 Mana5 integrated cockpit with labeled A, B, C dimensions
Geometry reference: A (stem length), B (width at drops), C (width at hoods).

CHAPTER2 Mana5 Integrated Cockpit — Geometry & Sizes

  • A = Stem length (mm)
  • B = Width at Drops (mm)
  • C = Width at Hoods (mm)
B/C Width Options
Size label B — Drops (mm) C — Hoods (mm)
405 / 355 405 355
416 / 366 416 366
427 / 377 427 377
438 / 388 438 388
449 / 399 449 399

A — Stem Lengths

80 | 90 | 100 | 110 | 120

B — Drops Widths

405 | 416 | 427 | 438 | 449

C — Hoods Widths

355 | 366 | 377 | 388 | 399

*Multiple factory combinations are available (e.g., 80×405, 90×416, 100×427, 110×438, 120×449, etc.). Stem angle −7°, reach 70 mm, drop 128 mm across sizes.

Compare RIRA Ultra geometry to other bikes on Geometry Geeks.

Browse compatible carbon wheelsets.

Additional information

BRAND

CHAPTER2
DISCIPLINE

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