The Shimano Dura-Ace ST-R9270 Di2 Left Lever + BR-R9270 Rear Disc Brake Kit is the pinnacle of road hydraulic braking — a factory pre-bled assembly that pairs Shimano's flagship 12-speed Di2 dual control lever with the MONO-BODY BR-R9270 rear caliper and a 1700mm hose, ready to install straight from the box. Designed for serious road and race cyclists who demand immediate, consistent stopping power alongside the precision of wireless electronic shifting.

Highlights

• Factory pre-bled J-Kit: ST-R9270 left lever, BR-R9270 rear caliper, 1700mm SM-BH90-JK-SSR hose, and L03A Ice-Tech finned resin pads arrive as a matched, bled assembly — no workshop bleed required on installation.
• Wireless Di2 shifting: Bluetooth Low Energy connection to your rear derailleur delivers instant, silent gear changes; customisable via the E-Tube Project app.
• MONO-BODY caliper construction: The BR-R9270 caliper is machined from a single cold-forged block, maximising stiffness and minimising weight while delivering 10% greater pad clearance to eliminate rotor rub.
• Servo Wave Action: Progressive lever feel widens the modulation range by 13% over the previous generation, giving you finer control from initial bite through full braking force.
• Reach and free-stroke adjustment: 16.4mm total reach adjustment range lets you dial in the perfect lever position for your hand size and riding style.
• Ice-Tech finned pads: L03A resin pads with cooling fins dissipate heat for fade-free braking on long descents.
• Mineral oil hydraulics: Shimano mineral oil is gentler on seals and paint than DOT fluid, and does not absorb moisture — long-term reliability without frequent fluid changes.
• CR1632 coin cell battery: Compact, easily sourced battery with an estimated 1.5–2 year lifespan keeps the lever self-powered.

Di2 Integration

The ST-R9270 left lever operates as part of the Shimano Dura-Ace R9200 Di2 ecosystem. Lever switch geometry has been redesigned with longer, more accessible switches and increased offset between them for reliable actuation from the drops. Wireless connectivity is built in — no junction box or wiring required between lever and derailleur. The lever is also compatible with satellite shifters SW-RS801 and SW-RS802 for climbing or aerodynamic bar positions.

BR-R9270 Rear Caliper

Shimano's MONO-BODY single-piece cold-forged caliper design achieves an optimal balance of stiffness and weight. The two-piston flat mount caliper uses Shimano mineral oil, compatible with the SM-BH90-JK-SSR hose system. The wider pad clearance design reduces the chance of pad-to-rotor contact during riding, keeping the ride quiet. Compatible with 140mm and 160mm rotors.

Compatibility & Fit

This kit is the left-lever (rear brake) rear-position J-Kit with a 1700mm pre-bled hydraulic hose, suited to standard road frame rear brake routing. The caliper uses flat mount attachment (frame adapter required for post-mount frames). Compatible with Shimano Dura-Ace R9200 and R9270 12-speed Di2 groupsets. Brake caliper accepts 140mm or 160mm rotors (flat mount adapter required for 160mm). Uses Shimano mineral oil — not compatible with DOT fluid. Australian brake convention: left lever controls the rear brake.