The disc brake set for the top-level Dura-Ace road bike groupset from Shimano consists of two BR-R9270 and two ST-R9270 calipers. These are flat-mount brake calipers for front and rear and electronic shift/brake levers that enable wireless 2-speed or 12-speed shifting and hydraulic braking.
The BR-R9270 calipers are a one-piece mono-body design. Compared to the Ultegra version, this saves over 20 grams of weight at the rear and front and increases the stiffness even more. The brake pads have more free space than in the previous model, which prevents grinding of the brake rotor and reduces noise. The braking power of the two plastic pistons is tuned for competition use. In addition, the BR-R9270 earns points with a simple bleed process thanks to One Way Bleeding technology.
On the encoder units, both the brake levers and the grip bodies are made of carbon, which saves about 20 grams of weight per side compared to the Ultegra model. The ST-R9270 calipers are each powered by a CR1632 button cell battery, which lasts at least 1.5 years and that you can replace on your own. They communicate via a wireless protocol with the rear derailleur, which in turn is wired to the battery and indirectly to the front derailleur. Not only do you benefit from lightning-fast gear shifting and a tidy cockpit, but installation is also much easier without cables. Alternatively, you can also use the Dual Control levers fully wired. The ergonomics have been further optimized compared to previous models, and allow for a very comfortable grip. It is also possible to communicate wirelessly with a third-party device via special keys. In terms of braking performance, these Dura-Ace STIs go one step further than before: thanks to Servo Wave technology, the full braking power is available to you more quickly, but it can also be better dosed at the same time. In addition to the grip width, you can also adjust the empty travel, both using a 2 mm hex tool. With the help of the completely revised funnel (not included), even the bleed process is no problem.
The Dura-Ace disc brake set comes with brake hoses and with Ice-Tech resin pads, which ensure particularly good heat dissipation due to their cooling fins. However, you can also ride with it using conventional pads.
Specifications:Series: Dura-Ace R9250/R9270
Application: Road, Triathlon & Time Trial
Gearing: 2x, 12-speed
Shifting System: electronic, semi-wireless
Type: hydraulic, 2 pistons
Actuation: mineral oil
Hose Length (Front/Rear): 1000 mm / 1700 mm
Technical Information - Shift/Brake Lever:Brake Lever Material: carbon (CFRP)
Lever Body Material: carbon (CFRP)
Installation: clamp (closed)
Reach Adjust: bolt
Adjustment Options: reach adjust, contact point
Technical Information - Caliper:Installation: flat mount
Pads: L03A resin with cooling fins
Caliper Material: aluminum
Hose Connection: straight
Mounting Position: left for front brake caliper, right for rear brake caliper
Clamp Diameter: 23.8 - 24.2 mm
Power cable: EW-SD300 (1 x connection)
Rear Derailleur: RD-R9250, RD-R8150
Front Derailleur: FD-R9250, FD-R8150
Crankset: FC-R9200, FC-R9200-P, FC-R8100, FC-R8100-P
Cassette: CS-R9200-12, CS-R8100-12
Chain: CN-M9100, CN-M8100, CN-M7100, CN-M6100
Additional Brake Lever: BL-RX812
Satellite Shifter: SW-RS801-S, SW-RS801-T (1 x connection via EW-SD300)
Brake Rotor: 140 mm, 160 mm (recommended: RT-MT900)
Pads: Standard and Ice-Tech brake pads
- tidy cockpit, aesthetic look thanks to wireless connection
- wireless shifting, precise and fast (rear derailleur / front derailleur with cabling)
- battery CR1632 easy to replace with flat head screwdriver, 1.5 to 2 years runtime
- unique ergonomics thanks to feedback from professional riders
- softer handle cover
- Servo Wave technology for optimal brake control
- low weight thanks to carbon brake lever
- 16.4 mm reach adjust
- wired mounting also possible
- funnel bleeding
- firmware updates via E-Tube Project
- connection with Shimano Connected partner devices from Garmin or Wahoo possible via E-Tube
- lacquered brake lever and buttons
- one-piece construction for maximum stiffness and lower weight
- 10 % larger brake pad spacing minimizes grinding of the brake rotor, less noise development
- braking performance optimally tuned for road use
- coherent appearance and easy tool access thanks to flat mount
- optimized heat dissipation with Ice-Tech
- simple bleeding process
- 2 pistons made of synthetic resin
- steel bolts (4 mm)
Technology:STI Dual Control
Shimano Total Integration (STI) means the combination of braking and shifting functions in one lever, which increases safety when riding. By refining the technology, it became possible to make shifting so smooth at the front and rear that they can be triggered with just one finger. Shimano calls such levers Dual Control Levers (DCL).
Digital Integrated Intelligence (Di2)
Di2 systems are the electronic shifting systems from Shimano. They are based on the SEIS, the Shimano Electronic Intelligent System, which takes over the index shifting function from the mechanical components, only via power cables or radio signals and not via a Bowden cable. Shifting is done by simply pressing a button. This has the advantage that no great effort is required, your concentration on the ride is not disturbed and operation is easy even with cold hands. In addition, the electronic gear changes are very fast and highly precise. There is also no risk of a defective circuit due to dirty cables or other problems. You can adjust individual settings via the E-Tube Project, such as adjusting the shifting speed, the number of shifting operations per button press or the Synchro or Semi-Synchro shifting function. Shimano offers an app for this purpose. Gear maintenance and firmware updates are also done via E-Tube, with the bike connected to a PC running the appropriate E-Tube software for more extensive workshop work.
The Shimano Di2 12-speed road groupsets in the disc brake version work semi-wirelessly: at the crucial point, namely the interaction between STIs and rear derailleur, the cable is dispensed with, which makes for a tidy cockpit and considerably simplifies assembly. The wireless protocol is extremely fast and reliable, so that the shifting speed reaches a new level - with consistently high precision. Attention was also paid to keeping power consumption as low as possible. Cables are only used between the battery and the rear derailleur and between the battery and the front derailleur. These are thinner than the previous models and easier to lay. Shimano relies on a central battery located in the seatpost. This increases safety and ensures an uncomplicated charging process via the rear derailleur. Once fully charged, the circuit can be ridden for approx. 1000 km. If desired for peace of mind or other reasons, you can install the groupsets in the conventional way. The components are paired together via the E-Tube platform.
Servo Wave optimizes the leverage of your brake levers. During the braking process, the brake pads are guided quickly to the brake rotor with very short lever travel. The greater part of the lever travel is reserved for the actual braking force. This technology allows you to control your braking force more precisely and to apply it more effectively.
One Way Bleeding is a technique used on the brake caliper that makes it easier to bleed the brake. The hose routing has been optimized so that no air bubbles remain in the brake caliper. In combination with the funnel, the brake can be bled cleanly and easily.
Manufacturer Numbers:I-R9270DLF6SC100A (front) & I-R9270DRRDSC170A (rear)
Contents:- 1 x Shimano Dura-Ace BR-R9270 + Dura-Ace Di2 ST-R9270 Disc Brake, Left Front
- 1 x Shimano SM-BH90-JK-SSR brake hose, 1000 mm (front)
- 1 x pair Shimano L03A brake pads
- 1 x front disc brake adapter
- 1 x hose connection set with olive (mounted) and insert pin
- 1 x type A caliper bolts for front wheel
- ready for installation, filled, bleeding is recommended after installation
- black/set (front & rear): 580 g (Pair)