{"product_id":"shimano-grx-fc-rx820-1-crankset-172-5mm-12-speed-40t-110-bcd-hollowtech-ii-blk","title":"Shimano GRX FC-RX820-1 12-Speed 1x 40T Hollowtech II 172.5mm Black Crankset","description":"\u003cp\u003eThis Shimano GRX FC-RX820-1 is set up with \u003cstrong\u003e172.5mm arms and a single 40T ring\u003c\/strong\u003e for 12-speed 1x gravel drivetrains. It sits on the Hollowtech II spindle interface and comes in black.\u003c\/p\u003e\u003cp\u003eShimano describes the RX820 as balancing weight savings, efficiency and a spread of gearing options for mixed-terrain riding. A \u003cstrong\u003e40T ring\u003c\/strong\u003e is a versatile 1x choice for gravel, and 172.5mm sits between the common 170 and 175 lengths. The bottom bracket is sold separately.\u003c\/p\u003e\u003ch4\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eGravel riders running Shimano GRX 12-speed 1x\u003c\/li\u003e\n\u003cli\u003eRiders who fit best at 172.5mm\u003c\/li\u003e\n\u003cli\u003eOwners of Hollowtech II-compatible gravel frames\u003c\/li\u003e\n\u003cli\u003eConsider a different crank if you need a 2x setup or 11-speed compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003e\u003cstrong\u003eWhat to Look For\u003c\/strong\u003e\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpindle interface:\u003c\/strong\u003e Shimano Hollowtech II — pair with a compatible Hollowtech II bottom bracket (not included).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed and ring:\u003c\/strong\u003e 12-speed 1x with a 40T ring on 110 Shimano asymmetric BCD.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame fit:\u003c\/strong\u003e listed for 135\/142 road disc hubs with chainstays over 415mm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eHollowtech II spindle.\u003c\/strong\u003e Uses Shimano's Hollowtech II interface. Choosing the matching bottom bracket for your frame shell is the main fitment step.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e40T single ring on 110 asymmetric BCD.\u003c\/strong\u003e The 110 Shimano asymmetric pattern means replacement rings must match that pattern, which keeps future gearing changes simple within the Shimano ecosystem.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eGravel-specific chainline.\u003c\/strong\u003e Listed for 135\/142 road disc hubs on frames with chainstays over 415mm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e172.5mm length.\u003c\/strong\u003e The half-step between 170 and 175 lets a fitter fine-tune knee angle and hip opening without a full 2.5mm jump either way. Black finish, 9\/16\" pedal threads, and a listed weight of 644g.\u003c\/p\u003e\u003ch4\u003e\u003cstrong\u003eRider Intent Summary\u003c\/strong\u003e\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBiggest strengths:\u003c\/strong\u003e 12-speed GRX 1x gearing, a versatile 40T ring, and a 644g listed weight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTradeoffs:\u003c\/strong\u003e No bottom bracket, single length per listing, and 12-speed only.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat makes it different:\u003c\/strong\u003e It's Shimano's 12-speed gravel 1x crank at the GRX RX820 level.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003e\u003cstrong\u003eVictory's Take\u003c\/strong\u003e\u003c\/h4\u003e\u003cp\u003eWe'd reach for this 172.5mm RX820 for riders whose fit lands between 170 and 175, and Victory Bicycle Studio can confirm that length during a fit.\u003c\/p\u003e\u003ch4\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Shimano\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e GRX FC-RX820-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrank length:\u003c\/strong\u003e 172.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrivetrain speeds:\u003c\/strong\u003e 12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChainring:\u003c\/strong\u003e 40T single\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBCD:\u003c\/strong\u003e 110 Shimano asymmetric\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpindle interface:\u003c\/strong\u003e Shimano Hollowtech II\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChainline \/ hub compatibility:\u003c\/strong\u003e 135\/142 road disc hubs, chainstay \u0026gt; 415mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntended use:\u003c\/strong\u003e Gravel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 644g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePedal thread:\u003c\/strong\u003e 9\/16\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBottom bracket:\u003c\/strong\u003e Not included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e IFCRX8201DXB0\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shimano","offers":[{"title":"Default Title","offer_id":53546081812787,"sku":"IFCRX8201DXB0","price":280.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0981\/3685\/0739\/files\/c8d370db7303a7ba59e6abd5bde5aaaba47c1681.jpg?v=1782346429","url":"https:\/\/victorybicyclestudio.com\/products\/shimano-grx-fc-rx820-1-crankset-172-5mm-12-speed-40t-110-bcd-hollowtech-ii-blk","provider":"Victory Bicycle Studio","version":"1.0","type":"link"}