WorldTour-Level Components. Exceptionally Low Weight.
The X-LAB RT9 is a high-performance carbon road bike built for racing, climbing and fast road riding. Its Toray T1100 + M40X carbon frame is paired with Shimano Dura-Ace Di2 electronic shifting, a power-meter crankset, an integrated carbon cockpit and Branta C50 ULR carbon wheels.
At a claimed 6.20 kg in size L, the RT9 is exceptionally light for a complete disc-brake road bike. It suits riders looking for immediate acceleration, efficient climbing and precise handling without needing to plan an expensive list of upgrades.
Toray T1100 + M40X Carbon Frameset
The RT9 uses a high-grade Toray T1100 + M40X carbon frame with a matching Toray T1100 carbon fork. Its low weight and race-focused geometry create a responsive platform for climbing, sprinting and fast changes of direction.
A conventional 27.2 mm carbon seatpost allows useful adjustment and helps take some of the sting out of coarse road surfaces. The threaded BSA bottom bracket is also a practical inclusion, making servicing more straightforward than many press-fit systems.
SRAM UDH compatibility provides a widely supported replacement derailleur-hanger standard, while 12 mm thru-axles help maintain accurate wheel and brake alignment.
Shimano Dura-Ace Di2
Shimano Dura-Ace R9200 Di2 provides fast and consistent electronic shifting through a 2 × 12-speed drivetrain. The wireless shift controls keep the cockpit tidy, while the derailleurs are powered by the central Di2 battery.
A 52/36T crankset and 11–34T cassette give the RT9 a useful balance of high-speed gearing and manageable climbing ratios. This makes it suitable for road racing and fast bunch rides without committing the rider to an excessively tall traditional race cassette.
Dura-Ace hydraulic disc brakes provide controlled braking in wet or dry conditions. A 160 mm front rotor supplies additional heat capacity and braking leverage, while the 140 mm rear rotor helps keep weight down.
Integrated Power Meter and Apple Find My
The Branta carbon crankset includes an integrated power meter, allowing riders to measure training effort, pace longer events and track performance without purchasing a separate crank or pedal system.
Apple Find My technology is also built into the crankset, providing an additional way to locate the bike through a compatible Apple account and device. This is a useful security feature, but it does not replace a quality physical lock when the bike is left unattended.
Branta C50 ULR Carbon Wheels
The Branta C50 ULR wheelset uses carbon rims and carbon spokes with ceramic bearings. Its 50 mm rim depth provides an aerodynamic profile for racing and fast road riding while remaining suitable for rolling and hilly courses.
Michelin Pro 5 700 × 28C tyres provide a sensible balance of speed, grip and everyday road comfort. The frame has a maximum recommended tyre clearance of 700 × 30C.
Integrated Carbon Cockpit
The Branta integrated carbon cockpit combines the handlebar and stem into a clean, lightweight unit. Handlebar width and stem length vary by frame size to provide more suitable proportions across the range.
An integrated cockpit offers a tidy front end, but it also provides less adjustment than separate handlebars and stems. We recommend confirming the frame size, handlebar width and stem length before ordering.
Selle Italia SLR Boost Saddle
A Selle Italia SLR Boost saddle with carbon rails completes the lightweight build. Saddle comfort is personal, so the supplied saddle should be treated as a high-quality starting point rather than a guarantee of the correct shape or width for every rider.
Key Features
- Toray T1100 + M40X carbon frame
- Toray T1100 full-carbon fork with 12 × 100 mm thru-axle
- SRAM UDH-compatible derailleur hanger
- Shimano Dura-Ace Di2 2 × 12-speed drivetrain
- Shimano Dura-Ace hydraulic disc brakes
- 52/36T Branta carbon power-meter crankset
- Wide-range 11–34T Dura-Ace cassette
- Built-in Apple Find My technology
- Branta integrated carbon cockpit
- Branta C50 ULR carbon wheelset
- Carbon rims and spokes
- Ceramic wheel bearings
- Michelin Pro 5 700 × 28C tyres
- Maximum recommended tyre clearance of 700 × 30C
- Selle Italia SLR Boost saddle with carbon rails
- Threaded BSA bottom bracket
- Shadowbox Black finish
- Claimed weight of 6.20 kg in size L
Who Is It For?
- Road racing and competitive events
- Fast bunch rides
- Climbing-focused road riding
- Performance training and power-based workouts
- Gran fondos and long road events
- Riders wanting Shimano Dura-Ace Di2
- Riders looking for a very light complete road bike
- Experienced riders who know their preferred cockpit dimensions
The RT9 uses a performance-focused riding position. Riders wanting a more upright position, greater tyre clearance or extra comfort for rough roads may be better suited to an endurance road bike.
Our Thoughts
The headline figure is the 6.20 kg claimed weight, but the RT9 is more than a light frame with inexpensive parts added to meet a price. Dura-Ace Di2, carbon-spoked C50 wheels, an integrated carbon cockpit, power meter and carbon-railed saddle make this a properly high-level build.
The 52/36T gearing and 11–34T cassette are also a sensible combination. There is enough top-end gearing for racing, but the 34T largest sprocket makes the bike more manageable on long or steep climbs than a close-ratio race cassette.
Fit deserves careful attention. The integrated cockpit limits easy stem and handlebar changes, while the short crank lengths are quite different from those traditionally supplied on road bikes. That may suit riders looking for improved cornering clearance and a more open hip angle, but it should be considered as part of the complete bike fit.
For a rider wanting a very light race bike with top-level electronic shifting and a power meter already fitted, the RT9 offers an impressive specification straight out of the box.
Technical Specifications
Frameset
- Frame: XDS carbon, Toray T1100 + M40X construction, SRAM UDH compatible
- Fork: XDS Toray T1100 carbon, 12 × 100 mm thru-axle
- Bottom bracket: Threaded BSA for 29 mm spindle
- Seatpost: XDS carbon, 27.2 mm
Drivetrain
- Shift levers: Shimano Dura-Ace ST-R9270 Di2
- Front derailleur: Shimano Dura-Ace FD-R9250 Di2
- Rear derailleur: Shimano Dura-Ace RD-R9250 Di2
- Crankset: Branta carbon power-meter crankset
- Chainrings: 52/36T
- Crank spindle: 29 mm aluminium
- Security technology: Integrated Apple Find My
- Cassette: Shimano Dura-Ace CS-R9200, 12-speed, 11–34T
- Chain: Shimano CN-M9100
Brakes
- Brake callipers: Shimano Dura-Ace BR-R9270 hydraulic disc
- Front rotor: Shimano SM-MT900, 160 mm
- Rear rotor: Shimano SM-MT900, 140 mm
Wheels and Tyres
- Wheelset: Branta C50 ULR
- Rims: Carbon, 50 mm depth
- Spokes: Carbon
- Bearings: Ceramic
- Tyres: Michelin Pro 5, 700 × 28C
- Maximum tyre clearance: 700 × 30C
Cockpit and Contact Points
- Cockpit: Branta integrated carbon handlebar and stem
- Seatpost: XDS carbon, 27.2 mm
- Saddle: Selle Italia SLR Boost with carbon rails
Sizes, Colour and Weight
- Sizes: XS, S, M and L
- Colour: Shadowbox Black
- Claimed weight: 6.20 kg in size L
Size Guide
| Size | Recommended Rider Height | Stem | Handlebar | Crank Length | Seatpost Length |
|---|---|---|---|---|---|
| XS | 148–158 cm | 80 mm | 360 mm | 160 mm | 300 mm |
| S | 158–168 cm | 100 mm | 360 mm | 160 mm | 300 mm |
| M | 168–176 cm | 100 mm | 380 mm | 165 mm | 350 mm |
| L | 176–183 cm | 120 mm | 400 mm | 165 mm | 350 mm |
Rider height is only a starting point. Body proportions, flexibility, riding experience and preferred position can influence the best size. The integrated cockpit makes confirming reach and handlebar width particularly important.
Geometry
| Measurement | XS | S | M | L |
|---|---|---|---|---|
| Seat-tube length | 430 mm | 460 mm | 480 mm | 500 mm |
| Top-tube length | 498 mm | 520 mm | 540 mm | 563 mm |
| Head-tube length | 110 mm | 120 mm | 137 mm | 157 mm |
| Seat-tube angle | 75° | 74° | 74° | 74° |
| Head-tube angle | 71° | 72° | 73° | 74° |
| Chainstay length | 410 mm | 410 mm | 410 mm | 410 mm |
| Wheelbase | 973 mm | 977 mm | 978 mm | 992 mm |
| Fork offset | 50 mm | 50 mm | 44 mm | 44 mm |
| Bottom-bracket drop | 74 mm | 74 mm | 72 mm | 72 mm |
| Stack | 510 mm | 525 mm | 543 mm | 567 mm |
| Reach | 362 mm | 372 mm | 384 mm | 396 mm |
| Front centre | 574 mm | 578 mm | 578 mm | 592 mm |
| Trail | 68 mm | 61 mm | 59 mm | 56 mm |
Assembly and Setup
Every X-LAB RT9 purchased from Chain Reaction is professionally assembled, tuned and safety checked by our workshop.
- Complete professional assembly
- Shimano Dura-Ace Di2 setup and firmware check
- Front and rear derailleur adjustment
- Hydraulic brakes checked and bedded in
- Wheel, headset and bottom-bracket checks
- Power meter setup and function check
- Cockpit and saddle positions initially adjusted
- Tyre pressures checked and set
Why Buy from Chain Reaction?
- Professionally assembled, tuned and safety checked
- Shimano Di2 system checked and configured
- Firmware checked and updated where required
- Hydraulic brakes professionally checked and bedded in
- Power meter setup and pairing assistance
- Initial cockpit and saddle setup
- Expert road-bike sizing and setup advice
- Complete feature and maintenance walkthrough
- Finance and WorkRide options available
Visit Chain Reaction at 4/218 Moorhouse Avenue, Christchurch. There are more than 200 free car parks on-site, along with room for sizing and bike setup.
Contact Chain Reaction to confirm current availability. Specifications are based on current manufacturer information and may change without notice. Claimed weight is based on a size L production bike and may vary with frame size and component variation.
