{"product_id":"shimano-grx-fc-rx820-1x12-speed-crankset-42t","title":"SHIMANO GRX FC-RX820 1x12-SPEED CRANKSET 42T","description":"\u003ch3\u003eThe Shimano GRX FC-RX820-1 HOLLOWTECH II crankset delivers lightweight performance engineered for mixed terrain riding.\u003c\/h3\u003e\n\u003cp\u003eIts 1x12-speed drivetrain provides tighter gear graduations that maintain smooth cadence across gravel and variable surfaces. The 42T chainring offers versatile gearing for climbing and acceleration, while HOLLOWTECH II construction minimises weight without compromising rigidity. Designed specifically for gravel riding demands, this crankset balances efficiency with the durability needed for unpredictable terrain.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGravel gear ratios preserve riding rhythm over rough surfaces with wider tyres\u003c\/li\u003e\n\u003cli\u003eOptimum gearing for mixed terrains and riding styles\u003c\/li\u003e\n\u003cli\u003e10-45T and 10-51T cassette options serve array of riding styles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecification\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse: \u003c\/strong\u003eGravel, Cyclocross\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGroup:\u003c\/strong\u003e GRX\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel: \u003c\/strong\u003eFC-RX820-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGradation:\u003c\/strong\u003e 42T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ-Factor: \u003c\/strong\u003e151mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreaded BB shell width: \u003c\/strong\u003e68 \/ 70mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eGear front: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e1-speed \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGear rear:\u003c\/strong\u003e 12-speed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Hollowtech II\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Chain:\u003c\/strong\u003e 12-speed HG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePCD: \u003c\/strong\u003e110mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChain line: \u003c\/strong\u003e49.7mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended BB Pressfit:\u003c\/strong\u003e SM-BB72\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended BB BSA:\u003c\/strong\u003e SM-BBR60\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCrank Arm Length\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e170mm\u003c\/li\u003e\n\u003cli\u003e172.5mm\u003c\/li\u003e\n\u003cli\u003e175mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMaterial\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrank arm:\u003c\/strong\u003e Aluminium Anodized\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrank axle:\u003c\/strong\u003e Steel Plated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChainring:\u003c\/strong\u003e Aluminium Anodized\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eColour\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSeries colour\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWeight\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eApprox. 667g - 172.5mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eContents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Shimano GRX 1x12-Speed Crankset FC-RX820 42T\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SHIMANO","offers":[{"title":"170mm","offer_id":57073768825207,"sku":"FCRX8201C2","price":209.99,"currency_code":"GBP","in_stock":true},{"title":"172.5mm","offer_id":57073768857975,"sku":"FCRX8201D2","price":209.99,"currency_code":"GBP","in_stock":true},{"title":"175mm","offer_id":57073768890743,"sku":"FCRX8201E2","price":209.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/2350\/2370\/files\/ShimanoGRX1x12-SpeedCranksetFC-RX82040.avif?v=1778082176","url":"https:\/\/www.allterraincycles.co.uk\/products\/shimano-grx-fc-rx820-1x12-speed-crankset-42t","provider":"allterraincycles","version":"1.0","type":"link"}