{"product_id":"ohlins-cylinder-head-ttx36-21870-02","title":"Öhlins Cylinder head TTX36 – 21870-02","description":"\u003cp\u003eCylinder head TTX36, Öhlins part number 21870-02. Surface finish is specified in microns, because it decides how quickly the piston band wears.\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 21870-02\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFunction\u003c\/h2\u003e\u003cp\u003eÖhlins publishes no separate dimension for this position, so the part number carries the identity. A tube that has been bottomed hard often shows a ring mark; that is a reason to replace it. Surface finish is specified in microns, because it decides how quickly the piston band wears. Tubes are replaced when the bore is marked; polishing them out changes the clearance and makes it worse.\u003c\/p\u003e\u003ch2\u003eOriginal Öhlins Part\u003c\/h2\u003e\u003cp\u003eÖhlins numbers every position so a workshop can order precisely what it needs, not a whole assembly. Suspension is one of the few areas where the original part is genuinely the cheaper decision. Service parts are ordered per piece unless stated otherwise. We can check the number against the Öhlins exploded view before you order — just ask.\u003c\/p\u003e\u003ch2\u003eHow to Be Sure It Fits\u003c\/h2\u003e\u003cp\u003e21870-02 is the Öhlins number for this position — the same one printed in the service documentation. Öhlins does not publish a dimension here — go by the number and the exploded view. The cylinder head closes the working bore and carries the shaft seal and its bushing. 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\u003eFitting and Setup Service\u003c\/h2\u003e\u003cp\u003eIf you would rather not open the damper yourself, we can do it — we are an authorised Öhlins service centre and rebuild these units as a matter of routine.\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 21870-02\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":53652895629578,"sku":"21870-02","price":184.87,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/21870-02_0bd10567-e149-41a0-8a1d-51e6605d3977.png?v=1788880370","url":"https:\/\/inter-pace.com\/en-nl\/products\/ohlins-cylinder-head-ttx36-21870-02","provider":"Inter-Pace","version":"1.0","type":"link"}