{"product_id":"ohlins-cylinder-tube-30-34-305-21646-04","title":"Öhlins Cylinder tube 30\/34\/305 – 21646-04","description":"\u003cp\u003eCylinder tube 30\/34\/305, Öhlins part number 21646-04. Diameter and length together identify the tube — both are specific to the damper it came from.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLength 34 mm\u003c\/li\u003e\n\u003cli\u003eOriginal Öhlins service part\u003c\/li\u003e\n\u003cli\u003eÖhlins part number 21646-04\u003c\/li\u003e\n\u003cli\u003eDiameter 30 mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhere It Sits\u003c\/h2\u003e\u003cp\u003eAt 30 mm, 34 mm it fits one position only; the next size up carries a different number. A scored bore means lost damping, because the oil bypasses the piston rather than being forced through the shims. Öhlins hones its tubes to a defined surface finish rather than simply to a diameter. 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\u003eThe tolerances here are the ones the unit was assembled to, not a pattern equivalent's interpretation of them. The alternative to a service part is usually a new damper, which is why this catalogue exists. Where a number has been superseded, Öhlins states the replacement — we pass that on. We can supply the whole position from the drawing rather than the single piece if that is easier.\u003c\/p\u003e\u003ch2\u003eHow to Be Sure It Fits\u003c\/h2\u003e\u003cp\u003eÖhlins identifies this position by the number 21646-04 in the exploded view for the unit it belongs to. The published dimensions are diameter 30 mm, length 34 mm — measure the old part against them if you are unsure. A tube that has been bottomed hard often shows a ring mark; that is a reason to replace it. The tube also carries the end cap threads, so thread damage means a new tube.\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 21646-04\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eCategory:\u003c\/em\u003e Cylinder Tubes\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eDiameter:\u003c\/em\u003e 30 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eLength:\u003c\/em\u003e 34 mm\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":53650847629578,"sku":"21646-04","price":125.08,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/21646-04_abaf6388-dadd-41c0-893e-9514e071878d.png?v=1788877405","url":"https:\/\/inter-pace.com\/products\/ohlins-cylinder-tube-30-34-305-21646-04","provider":"Inter-Pace","version":"1.0","type":"link"}