{"product_id":"knock-block-headset-upper","title":"Knock Block Headset Upper","description":"\u003cp\u003eWolf Tooth Precision Headsets for Trek Knock Block are machined in the USA out of aircraft grade aluminum with superior sealing for protection against the elements. Available in a variety of colors to add some style to your bike. These upper headsets are for Trek frames with molded-in internal bearing cups.\u003c\/p\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eDesigned to work with Trek's Knock Block system\u003c\/li\u003e\n\u003cli\u003eThe top cap on these headsets have unique raised features that key to Knock Block compatible stems (made by Bontrager\u003c\/li\u003e\n\u003cli\u003eIf spacers are needed, you will need to use special Knock Block compatible spacers with notch features\u003c\/li\u003e\n\u003cli\u003eThis product is the upper headset only\u003c\/li\u003e\n\u003cli\u003eLower headsets on bikes with Knock Block do not have any unique features. They are usually IS headsets which are available separately\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Wolf Tooth","offers":[{"title":"Black","offer_id":46704456040696,"sku":"IS41U-8MM-KNOCK-BLK","price":59.95,"currency_code":"USD","in_stock":true},{"title":"Red","offer_id":46704456073464,"sku":"IS41U-8MM-KNOCK-RED","price":59.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0357\/3930\/4074\/files\/HD0284.jpg?v=1770254155","url":"https:\/\/shopbikesupply.com\/products\/knock-block-headset-upper","provider":"Sierra Bicycle Supply","version":"1.0","type":"link"}