The Shimano 105 Di2 ST-R7170 right lever and BR-R7170 front calliper set brings wireless electronic shifting and hydraulic disc braking to road riders who demand precision without the Dura-Ace price. The R7170 system inherits ergonomics and technology from the top of the Shimano road range, delivering consistent, fade-resistant stopping power and effortless gear changes on every ride.

Highlights

• Wireless Di2 electronic shifting: The ST-R7170 lever connects wirelessly to compatible Shimano 105 Di2 derailleurs — no wiring harness required through the handlebars.
• 12-speed precision: Part of the Shimano 105 R7100 Di2 groupset, delivering accurate, repeatable shifts across a 12-speed drivetrain.
• Hydraulic disc braking: The paired BR-R7170 calliper provides powerful, modulated stopping in all conditions using Shimano mineral oil for a clean, low-maintenance system.
• ICE Technologies finned resin pads: Pre-fitted L02A resin pads with cooling fins dissipate heat for consistent performance on long descents.
• One-way bleeding: The BR-R7170 calliper supports one-way bleeding for simple, mess-free maintenance.
• Reach adjustment: Tool-based lever reach adjustment lets riders dial in blade position for their hand size and riding style.
• Long battery life: Powered by two CR1632 coin cell batteries, delivering an estimated 3.5–4 years of use before replacement is needed.
• Dura-Ace inspired ergonomics: The raised hood peak and extended body shape is drawn directly from Dura-Ace development for all-day comfort.

Design & Construction

The ST-R7170 lever body is constructed from aluminium and carbon composite for a balance of rigidity and low weight. The BR-R7170 calliper features an aluminium body with ceramic pistons and Shimano's Flat Mount system — the low-profile mounting standard designed specifically for road disc bikes, keeping the calliper tucked close to the fork for a clean aesthetic and excellent mud clearance. Wide pad clearance reduces the likelihood of rotor rub and makes wheel removal straightforward.

Ready to Install

This set ships with the ST-R7170 right lever, the BR-R7170 front disc calliper, and a pre-bled SM-BH90-JK-SSR hydraulic hose, so the brake side is ready to install with minimal workshop time. Customise button functions and configure Synchro-Shift settings via the Shimano E-TUBE Project app.

Compatibility & Fit

Designed for Shimano 105 Di2 R7100-series 12-speed road groupsets. The ST-R7170 lever supports wireless Di2 only — it is not compatible with wired Di2 or mechanical shifting. The BR-R7170 calliper uses Shimano Flat Mount and is compatible with 140mm and 160mm rotors (adaptor included for 160mm). Uses Shimano hydraulic mineral oil. Compatible with 23.8–24.2mm drop bar clamp diameter. In Australian convention, the right lever operates the front brake.