{"product_id":"shimano-st-r8170-left-lever-w-br-r8170-rear-disc-b","title":"Shimano ST-R8170 Left Lever w\/BR-R8170 Rear Disc Brake","description":"\u003cp\u003ePrecision braking and lightning-fast wireless shifting in one integrated package — the Shimano Ultegra Di2 ST-R8170 left lever and BR-R8170 rear disc brake caliper deliver road-race-level control for every rider, in every condition.\u003c\/p\u003e\n\u003ch3\u003eHighlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWireless Di2 electronic shifting:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e2x12-speed compatibility with no cables between shifters — clean cockpit, instant response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eServo Wave hydraulic disc braking:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003evariable mechanical leverage delivers rapid initial pad engagement followed by smooth, progressive braking power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-mount BR-R8170 rear caliper:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003etwo-piston hydraulic design with 10% wider pad-to-rotor clearance for quieter, cleaner braking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16.4 mm reach adjust:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edial in lever position to suit any hand size without the need for tools.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong-life CR1632 battery:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eup to 1.5–2 years between battery changes per lever, with easy coin-cell replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Way Bleeding system:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003equick, clean hydraulic servicing with minimal mess.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomisable shift modes:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eManual, Full Synchro-Shift, and Semi Synchro-Shift programmable via the E-Tube Project app.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSatellite shifter compatible:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003esupports SW-RS801 series satellite shifters for TT\/aero bar setups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLever Design \u0026amp; Ergonomics\u003c\/h3\u003e\n\u003cp\u003eThe ST-R8170 hood features an all-new profile with a raised peak that curves gently inward, giving your palm a more secure resting position on long climbs and technical descents. Three programmable switches per lever let you assign functions to suit your riding style via the Shimano E-Tube Project app. Reach adjust lets you position the lever blade up to 16.4 mm closer to the bar for confident single-finger braking from the drops or hoods — no tools required.\u003c\/p\u003e\n\u003ch3\u003eBraking Performance\u003c\/h3\u003e\n\u003cp\u003eThe BR-R8170 flat-mount caliper pairs Servo Wave technology with a two-piston design, varying the mechanical leverage ratio across the lever stroke. Initial pull rapidly brings the pads to the rotor; braking power then builds in a smooth, controllable curve — no sudden grab or lock-up. The 10% wider pad-to-rotor clearance compared to the previous generation reduces noise from minor rotor flex, making this the quietest Ultegra disc brake system to date. Easy Hose Joint (J-Kit) simplifies hose installation at the bench or on the road.\u003c\/p\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fit\u003c\/h3\u003e\n\u003cp\u003eThis is the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eleft lever\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(rear brake in Australian drop-bar convention) combined with the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003erear brake caliper\u003c\/strong\u003e. Compatible with Shimano Ultegra R8100 and Dura-Ace R9200 Di2 groupsets. Works with FD-R9250, FD-R8150 front derailleurs and RD-R9250, RD-R8150 rear derailleurs. The BR-R8170 caliper is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eflat-mount\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand accepts 140 mm or 160 mm rotors. Compatible brake hoses: SM-BH90-JK-SSR (not included). Uses Shimano mineral oil — do not use DOT fluid. Compatible brake pads: L04C, L03A (resin). Rotor and hose sold separately.\u003c\/p\u003e","brand":"Shimano","offers":[{"title":"Default","offer_id":42582051127355,"sku":"IR8170DLRDSC170F","price":499.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0630\/9819\/1931\/files\/SHM-IR8170DLRDSC170F.jpg?v=1789000481","url":"https:\/\/cyclehouse.com.au\/products\/shimano-st-r8170-left-lever-w-br-r8170-rear-disc-b","provider":"Cycle House","version":"1.0","type":"link"}