{"product_id":"ohlins-cylinder-head-ttx39-21901-01","title":"Öhlins Cylinder head TTX39 – 21901-01","description":"\u003cp\u003eCylinder head TTX39, Öhlins part number 21901-01. Twin-tube dampers use two concentric tubes, and both are listed separately.\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 21901-01\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFunction\u003c\/h2\u003e\u003cp\u003eThis position is identified by its number rather than by a dimension. Surface finish is specified in microns, because it decides how quickly the piston band wears. Reservoir tubes carry the gas charge and are built to the same standard as the working cylinder. Öhlins turns and hones each tube to a defined roundness, because an out-of-round bore leaks past the piston.\u003c\/p\u003e\u003ch2\u003eWhy the Original\u003c\/h2\u003e\u003cp\u003eÖhlins supports its suspension with individual service parts, which is why a fifteen-year-old damper can still be rebuilt to specification. Öhlins numbers every position so a workshop can order precisely what it needs, not a whole assembly. The exploded drawing for your unit names the number; if you do not have it, we do. The Öhlins exploded view names the number for each position; we can look it up if you do not have it.\u003c\/p\u003e\u003ch2\u003eHow to Be Sure It Fits\u003c\/h2\u003e\u003cp\u003eIf the unit is already open, compare the dimensions below with the part in your hand before ordering 21901-01. This position has no published dimension, so the part number is the only reliable identifier. Wall thickness and bore finish are what let a cylinder hold pressure without deforming under load. Most seal kits are built around a specific head design.\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 21901-01\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":53652909785354,"sku":"21901-01","price":469000.0,"currency_code":"CDF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/21901-01_be6342b0-329e-40a3-b63f-68c753372bdf.png?v=1788880410","url":"https:\/\/inter-pace.com\/en-cd\/products\/ohlins-cylinder-head-ttx39-21901-01","provider":"Inter-Pace","version":"1.0","type":"link"}