{"product_id":"shimano-grx-fc-rx820-48-31t-12-speed-175-mm-hollowtech-ii-chainset-black","title":"Shimano GRX FC-RX820 48\/31T 12-Speed 175 mm Hollowtech II Chainset - Black","description":"\u003cp\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cp\u003eThe Shimano GRX chainset is purpose-built for gravel riding, combining rugged durability, optimised gearing, and efficient power transfer for mixed-terrain adventures. Designed as part of Shimano's dedicated GRX groupset, it delivers smooth performance across roads, gravel tracks, and challenging off-road routes.\u003c\/p\u003e\n\u003cp\u003eFeaturing a 48\/31T double chainring configuration, the chainset provides a versatile gear range suitable for steep climbs, fast road sections, and long-distance riding. Shimano's Hollowtech II construction ensures an excellent balance of stiffness, strength, and low weight, helping maximise pedalling efficiency on varied terrain.\u003c\/p\u003e\n\u003cp\u003eConstructed with anodised aluminium crank arms and lightweight aluminium chainrings, the GRX chainset is designed to withstand demanding riding conditions while maintaining reliable drivetrain performance. It is fully compatible with Shimano 12-speed Hyperglide+ chains for smooth and precise shifting.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned specifically for gravel riding\u003c\/li\u003e\n\u003cli\u003eShimano GRX gravel-focused drivetrain technology\u003c\/li\u003e\n\u003cli\u003e48\/31T double chainring configuration\u003c\/li\u003e\n\u003cli\u003eWide-ranging gearing for mixed terrain\u003c\/li\u003e\n\u003cli\u003eHollowtech II construction for efficient power transfer\u003c\/li\u003e\n\u003cli\u003eLightweight and durable aluminium construction\u003c\/li\u003e\n\u003cli\u003eSmooth shifting performance with 12-speed drivetrains\u003c\/li\u003e\n\u003cli\u003eCompatible with Shimano Hyperglide+ chains\u003c\/li\u003e\n\u003cli\u003eSuitable for gravel, adventure, endurance, and road cycling\u003c\/li\u003e\n\u003cli\u003eFour-arm chainring design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: Shimano\u003c\/li\u003e\n\u003cli\u003eSeries: GRX\u003c\/li\u003e\n\u003cli\u003eType: Chainset\u003c\/li\u003e\n\u003cli\u003eSpeed Compatibility: 12-Speed\u003c\/li\u003e\n\u003cli\u003eChainring Sizes: 48T \/ 31T\u003c\/li\u003e\n\u003cli\u003eCrank Length: 175 mm\u003c\/li\u003e\n\u003cli\u003eConstruction: Hollowtech II\u003c\/li\u003e\n\u003cli\u003eChain Compatibility: Shimano Hyperglide+ 12-Speed\u003c\/li\u003e\n\u003cli\u003eCrank Arm Material: Anodised Aluminium\u003c\/li\u003e\n\u003cli\u003eChainring Material: Aluminium\u003c\/li\u003e\n\u003cli\u003eBolt Circle Diameter (BCD): 110 mm\u003c\/li\u003e\n\u003cli\u003eChainring Design: 4-Arm\u003c\/li\u003e\n\u003cli\u003eColour: Grey\u003c\/li\u003e\n\u003cli\u003eIntended Use: Gravel, Adventure, Endurance and Road Cycling\u003c\/li\u003e\n\u003cli\u003eModel Year: 2026\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Shimano","offers":[{"title":"Grade A","offer_id":53847356178770,"sku":"Hal\/FC-RX820-2#A","price":228.89,"currency_code":"GBP","in_stock":false},{"title":"Grade B+","offer_id":53847356211538,"sku":"Hal\/FC-RX820-2#B","price":216.79,"currency_code":"GBP","in_stock":false},{"title":"Grade C+","offer_id":53847356244306,"sku":"Hal\/FC-RX820-2#C","price":192.59,"currency_code":"GBP","in_stock":false},{"title":"Grade D+","offer_id":53847356277074,"sku":"Hal\/FC-RX820-2#D","price":168.29,"currency_code":"GBP","in_stock":false},{"title":"NEW","offer_id":53847356309842,"sku":"Hal\/FC-RX820-2#NEW","price":198.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/8844\/7058\/files\/FC-RX820-2_20a.jpg?v=1782485422","url":"https:\/\/www.tlx.co.uk\/products\/shimano-grx-fc-rx820-48-31t-12-speed-175-mm-hollowtech-ii-chainset-black","provider":"TLX","version":"1.0","type":"link"}