{"product_id":"pro-zs56-40-headset-bottom-assembly","title":"PRO ZS56\/40 HEADSET BOTTOM ASSEMBLY","description":"\u003ch3\u003eDesigned for 1.5\" lower head tubes paired with 1 1\/8\" - 1.5\" tapered or 1.5\" forks.\u003c\/h3\u003e\n\u003cp\u003eThis bottom assembly ensures precise headset integration and smooth steering performance on modern trail and all-terrain bikes. Compatible with standard headset systems for reliable, long-lasting operation.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-quality materials and robust, resilient bearings ensure a long service life\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecification \u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUse: Road, Gravel, Cyclocross, Cross Country, Trail, All Mountain, Enduro, Downhill, Freeride\u003c\/li\u003e\n\u003cli\u003eBottom Cup: 1.5\"\u003c\/li\u003e\n\u003cli\u003eSteerer Tube: 1 1\/8\" - 1.5\" tapered, 1.5\"\u003c\/li\u003e\n\u003cli\u003eDesign: Zero Stack (ZS)\u003c\/li\u003e\n\u003cli\u003eMaterial: Aluminium\u003c\/li\u003e\n\u003cli\u003eBearings: High-quality steel ball bearings, double sealed\u003c\/li\u003e\n\u003cli\u003eBottom Outer Diameter: 56 mm\u003c\/li\u003e\n\u003cli\u003eBottom Inner Diameter: 40 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStandardized Headset Identification System (S.H.I.S.)\u003c\/h3\u003e\n\u003cp\u003eIn order to clarify and bring uniformity to a sea of headset standards, manufacturers Acros, Cane Creek, Hope, Race Face, Reset Racing and Ritchey have agreed upon using a shared nomenclature, which will likely include more participating companies in the future. This system takes into account a combination of frame and fork dimensions. Both the top and bottom parts of the headset are marked by two alphanumeric identifiers. The first identifier indicates the type of headset (External Cup, Zero Stack, Integrated) and head tube diameter. The second identifier - separated from the first by a backslash - indicates the diameter of the steerer tube. When referring to a complete headset, the specifications of both top and bottom parts must be combined.\u003c\/p\u003e\n\u003ch3\u003eClassification\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEC:Bearings contained within headset cups that are located outside of the frame (External Cup)\u003c\/li\u003e\n\u003cli\u003eZS:Bearings contained within pressed-in headset cups where the cup and bearings rest inside the frame (Zero Stack)\u003c\/li\u003e\n\u003cli\u003eIS:Bearings that fit directly into a bonded or machined interface that is integrated into the frame (Integrated)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eContents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x PRO lower headset cup incl. bearings\u003c\/li\u003e\n\u003cli\u003e1 x headset cap\u003c\/li\u003e\n\u003cli\u003e1 x star nut with aluminium bolt\u003c\/li\u003e\n\u003cli\u003e1 x crown race\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRO","offers":[{"title":"Default Title","offer_id":57341806969207,"sku":"PRSHS0060","price":44.49,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/2350\/2370\/files\/PROZS56HeadsetBottomAssembly.avif?v=1785484456","url":"https:\/\/www.allterraincycles.co.uk\/products\/pro-zs56-40-headset-bottom-assembly","provider":"allterraincycles","version":"1.0","type":"link"}