The CHAPTER2 RIRA Ultra UD + Gold frameset is engineered for riders who demand uncompromising speed, responsiveness, and climbing performance. Constructed from 100% Japanese Toray T1100 carbon, this flagship frame delivers a featherweight build (695g, size M) with a perfect blend of stiffness and agility for serious road racers and passionate cyclists alike. Every detail, from its aerodynamic tube shaping to advanced carbon layup, is optimized for sharp acceleration and precise handling. Compatible with the latest electronic drivetrains and boasting generous tire clearance, the RIRA Ultra is UCI-approved and ready for everything from summit attacks to all-day endurance rides.
Features & Benefits
- Ultra-Lightweight: Frame weighs just 695g (M), making it perfect for climbing and fast accelerations.
- Advanced Carbon Construction: Over 300 layers of premium Toray T1100 carbon for optimal strength-to-weight.
- Stiffness & Power Transfer: Improved BB and headtube stiffness for responsive sprinting and cornering.
- Aero-Optimized Design: Aerodynamic headtube and flat-backed seat tube reduce drag while maintaining comfort.
- Electronic Drivetrain Only: Engineered exclusively for Di2, eTap, or EPS electronic shifting for seamless performance.
- Generous Tire Clearance: Accepts up to 34mm (front) and 32mm (rear) for modern versatility and comfort.
- UCI Approved: Compliant with EN ISO 4210:2014 safety standards for racing and events.
Technical Specifications
- Frame: 100% Toray T1100 Carbon (Japan)
- Frame Weight: 695g (M, ±3%)
- Fork: 395g (uncut, ±3%)
- Bottom Bracket: EVO386 Press-Fit
- Seatpost: 27.2mm round (C2 “Tumu” optional)
- Tire Clearance: 34mm (Front), 32mm (Rear)
- Shifting: Electronic only (Di2, eTap, EPS)
- Brakes: Disc only, flat-mount
- Axles: 12x100mm (Front), 12x142mm (Rear)
- Certification: EN ISO 4210:2014, UCI Approved
What's Included
- RIRA Ultra UD + Gold Frame
- Carbon Fork (uncut)
- Integrated Headset (1.5” C2)
- Front & Rear Thru-Axles
- Quick-Fit Spacer Kit
- Sram UDH & Shimano Direct-Mount Derailleur Hangers
- Installation Guide
Rider Fit Guide
| Size | Recommended Height |
|---|---|
| XS | 150–165 cm |
| S | 160–172 cm |
| M | 170–180 cm |
| L | 178–188 cm |
| XL | 185–195+ cm |
| RIRA ULTRA | 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.
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