{"product_id":"harddrive-transmission-sprocket-21t-xl-91-up-820-54697","title":"Harddrive Transmission Sprocket - 21t XL 91-UP — Harley-Davidson Sportster 1200 Custom, Sportster 883, Super Low (1991-2019)","description":"\u003cp\u003eHarddrive 21-tooth transmission sprocket for Harley-Davidson XL Sportster 1991 and newer. Precision-machined with hardened teeth for durability, available in an offset configuration to accommodate wider tire fitment without primary or transmission modifications.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePrecision-machined hardened teeth\u003c\/li\u003e\n  \u003cli\u003eOE replacement specification\u003c\/li\u003e\n  \u003cli\u003eOffset design for wider tire clearance\u003c\/li\u003e\n  \u003cli\u003e1\/2\" offset available\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Harddrive\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 191365\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 191361169359\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTooth Count:\u003c\/strong\u003e 21\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 5 in L x 4 in W x 1 in H\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.21 lbs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e China (Taiwan)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits Harley-Davidson XL Sportster models 1991 and newer.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat tooth count should I choose for my Sportster?\u003c\/h3\u003e\n\u003cp\u003e21-tooth is the standard replacement. Smaller counts (19-20t) raise top-end speed; larger (22-23t) improve low-end torque. Choose based on your riding style.\u003c\/p\u003e\n\u003ch3\u003eDoes this sprocket come offset?\u003c\/h3\u003e\n\u003cp\u003eThis is an offset sprocket with 1\/2\" offset built in, allowing clearance for slightly wider tires without modifying primary or transmission.\u003c\/p\u003e\n\u003ch3\u003eWill this fit my 1989 or earlier Sportster?\u003c\/h3\u003e\n\u003cp\u003eNo — this part is for XL Sportster models 1991 and newer. Pre-1991 bikes use a different sprocket.\u003c\/p\u003e\n\u003ch3\u003eHow long do these sprockets last?\u003c\/h3\u003e\n\u003cp\u003eHardened-tooth construction extends mileage compared to standard sprockets. Lifespan depends on riding conditions and chain maintenance — inspect at each chain cleaning.\u003c\/p\u003e\n\u003ch3\u003eDo I need to replace the chain when installing a new sprocket?\u003c\/h3\u003e\n\u003cp\u003eIf your chain is worn, replace it with the sprocket. A new chain on a worn sprocket (or vice versa) causes accelerated wear to whichever part is new.\u003c\/p\u003e","brand":"Harddrive","offers":[{"title":"Default Title","offer_id":53035648254063,"sku":"820-54697","price":42.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/888e-5862dc4c78228.jpg?v=1777529044","url":"https:\/\/vtwinbikers.com\/products\/harddrive-transmission-sprocket-21t-xl-91-up-820-54697","provider":"Vtwinbikers","version":"1.0","type":"link"}