{"product_id":"shimano-grx-di2-rd-rx825","title":"Shimano GRX Di2 RD-RX825","description":"\u003cp\u003e\u003cb\u003e12-Speed Di2 Precision. Integrated Chain Control.\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThe engineering centerpiece of the \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003ca rel=\"noopener\" href=\"https:\/\/bike.shimano.com\" class=\"ng-star-inserted\" target=\"_blank\"\u003eShimano GRX RD-RX825 Derailleur\u003c\/a\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e is its \u003cb\u003eintegrated Shadow RD+ chain stabilizer\u003c\/b\u003e. Featuring a convenient ON\/OFF switch, the mechanical clutch applies firm tension to the derailleur cage to prevent chain bounce and chainring drops over technical surfaces. Built as the central hub of Shimano’s wireless Di2 system, the RD-RX825 houses the system’s charging port, LED status indicator, and wireless transmitter. Sending instant, precise signals to the front derailleur and shift levers without needing an external junction box.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWhy the GRX RD-RX825 Belongs on Your Gravel Bike:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e12Speed Di2 Electronic Precision:\u003c\/b\u003e Delivers instantaneous, hyper-accurate shifts across 11-34T or 11-36T 12Speed cassettes with zero shift cables to stretch, wear, or contaminate with trail mud.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eIntegrated Shadow RD+ Chain Stabilizer:\u003c\/b\u003e Engageable clutch mechanism keeps the chain taut over severe chatter, practically eliminating chain slap and drive-side chainstay damage.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCentral Wireless \u0026amp; Charging Hub:\u003c\/b\u003e Features an integrated magnetic charging port and wireless connectivity (Bluetooth LE \/ ANT+), allowing seamless pairing with the E-TUBE PROJECT app for custom button mapping and firmware updates.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eLow-Profile Shadow Architecture:\u003c\/b\u003e Keeps the derailleur body tucked tightly under the chainstay and cassette, protecting it from flying gravel, trail debris, and side impacts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eDurable Alloy Construction:\u003c\/b\u003e Built with high-strength aluminum link arms and a rigid pulley cage designed to withstand severe gravel racing and bikepacking conditions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eTechnical Specifications:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSeries:\u003c\/b\u003e Shimano GRX RX820 \/ RX825 Di2 Series\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eDrivetrain Speed:\u003c\/b\u003e 12Speed Electronic\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCassette Capacity:\u003c\/b\u003e 11-34T to 11-36T\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eMaximum Front Difference:\u003c\/b\u003e 17T (Optimized for GRX 48\/31T and 46\/30T 2x Cranksets)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eChain Stabilization:\u003c\/b\u003e Shadow RD+ Mechanical Clutch (With ON\/OFF Switch)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eConnectivity:\u003c\/b\u003e Wireless Di2 Protocol \/ Bluetooth LE \/ ANT+\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSystem Charging:\u003c\/b\u003e Magnetic EW-EC300 Charging Port\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eThe Alegro Perspective:\u003c\/b\u003e In the service bay, the RX825 derailleur is the beating heart of modern 12Speed Di2 gravel setups. Putting the charging port and wireless transmitter directly into the rear derailleur simplifies frame routing immensely no more buried junction boxes inside the seatpost or downtube. When you flip the Shadow RD+ clutch switch ON, the drivetrain becomes completely silent on rough gravel descents. It’s rock-solid, ultra-fast, and built to handle the worst weather and mud you can throw at it.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInstant Electronic Shifting. Total Chain Security. Master Modern Gravel with Shimano.\u003c\/b\u003e\u003c\/p\u003e","brand":"Shimano","offers":[{"title":"Default Title","offer_id":51233678786783,"sku":"IRDRX825A","price":595.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/5452\/3103\/files\/49161960eeb3d1e22b0f8b9ce5111a1dc84dcf19.png?v=1787164700","url":"https:\/\/alegrocycles.com\/products\/shimano-grx-di2-rd-rx825","provider":"Alegro Cycles","version":"1.0","type":"link"}