{"product_id":"ohlins-cylinder-head-ttx36-21897-11","title":"Öhlins Cylinder head TTX36 – 21897-11","description":"\u003cp\u003eCylinder head TTX36, Öhlins part number 21897-11. The tube is what the whole damper is built around: everything else references its bore.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eOriginal Öhlins service part\u003c\/li\u003e\n\u003cli\u003eÖhlins part number 21897-11\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat It Is\u003c\/h2\u003e\u003cp\u003eThere is no measurement to check here — the number and the exploded view identify it. Corrosion inside a tube is terminal: it cannot be honed out without changing the clearance. A head that has been over-tightened distorts and stops sealing. The cylinder tube is the working bore of the damper: the piston runs in it, and its finish decides how well the piston rings seal.\u003c\/p\u003e\u003ch2\u003eOriginal Öhlins Part\u003c\/h2\u003e\u003cp\u003eÖhlins manufactures service parts on the same lines as production parts — there is no second quality. The part number is the contract: it defines material, dimension and finish together. Service parts are supplied per piece unless the description says otherwise. Order by part number — descriptions repeat across sizes, numbers do not.\u003c\/p\u003e\u003ch2\u003eGetting the Number Right\u003c\/h2\u003e\u003cp\u003eÖhlins identifies this position by the number 21897-11 in the exploded view for the unit it belongs to. Öhlins does not publish a dimension here — go by the number and the exploded view. Surface finish is specified in microns, because it decides how quickly the piston band wears. Twin-tube dampers use two concentric tubes, and both are listed separately.\u003c\/p\u003e\u003ch2\u003eFitting and Setup Service\u003c\/h2\u003e\u003cp\u003eÖhlins recommends that its units are serviced by an authorised centre. We are one: rebuild, revalve and setup all happen in our own workshop.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cem\u003eBrand:\u003c\/em\u003e Öhlins\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003ePart Number:\u003c\/em\u003e 21897-11\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eCategory:\u003c\/em\u003e Cylinder Heads\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eCountry of Origin:\u003c\/em\u003e Sweden\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Öhlins","offers":[{"title":"Default Title","offer_id":53652908081418,"sku":"21897-11","price":284.32,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/21897-11_b4917ee0-4c32-41b7-9b2e-7cce9aea522c.png?v=1788880405","url":"https:\/\/inter-pace.com\/products\/ohlins-cylinder-head-ttx36-21897-11","provider":"Inter-Pace","version":"1.0","type":"link"}