{"product_id":"ohlins-cylinder-tube-178-5-fe-21006-64","title":"Öhlins Cylinder tube 178.5 Fe – 21006-64","description":"\u003cp\u003eCylinder tube 178.5 Fe, Öhlins part number 21006-64. Öhlins turns and hones each tube to a defined roundness, because an out-of-round bore leaks past the piston.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eÖhlins part number 21006-64\u003c\/li\u003e\n\u003cli\u003eOriginal Öhlins service part\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhere It Sits\u003c\/h2\u003e\u003cp\u003eThere is no measurement to check here — the number and the exploded view identify it. Aluminium tubes are hard-anodised in the bore so the piston band has a hard surface to run against. A scored bore means lost damping, because the oil bypasses the piston rather than being forced through the shims. Bore finish decides how well the piston band seals; a scored tube leaks damping past the piston.\u003c\/p\u003e\u003ch2\u003eOriginal Öhlins Part\u003c\/h2\u003e\u003cp\u003eA damper that can be rebuilt is a damper that stays on the bike; that is the whole argument for original service parts. This is an original Öhlins part, not an aftermarket equivalent — the tolerances are the ones the unit was assembled to. If the unit is already apart, compare the published dimensions with the part in your hand. Order by part number — descriptions repeat across sizes, numbers do not.\u003c\/p\u003e\u003ch2\u003eHow to Be Sure It Fits\u003c\/h2\u003e\u003cp\u003e21006-64 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 tube is the working bore: the piston runs inside it and every damping force is reacted by its wall. Reservoir tubes carry the gas charge and are built to the same standard as the working cylinder.\u003c\/p\u003e\u003ch2\u003eFitting and Setup Service\u003c\/h2\u003e\u003cp\u003eFitting service parts means opening a pressurised unit. As an authorised Öhlins service centre we do that here, with the right tools and a dyno check afterwards — just ask.\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 21006-64\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eCategory:\u003c\/em\u003e Cylinder Tubes\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":53652459618570,"sku":"21006-64","price":58.17,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/21006-64_9e4c6d3c-7c7d-4931-8e10-dc63235c1471.png?v=1788879256","url":"https:\/\/inter-pace.com\/en-eu\/products\/ohlins-cylinder-tube-178-5-fe-21006-64","provider":"Inter-Pace","version":"1.0","type":"link"}