{"product_id":"ohlins-shaft-12-393-alu-21637-01","title":"Öhlins Shaft 12\/393 Alu – 21637-01","description":"\u003cp\u003eShaft 12\/393 Alu, Öhlins part number 21637-01. Öhlins offers shafts in several lengths per diameter because the stroke differs by model.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eÖhlins part number 21637-01\u003c\/li\u003e\n\u003cli\u003eOriginal Öhlins service part\u003c\/li\u003e\n\u003cli\u003eLength 393 mm\u003c\/li\u003e\n\u003cli\u003eDiameter 12 mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFunction\u003c\/h2\u003e\u003cp\u003e21637-01 is the 12 mm, 393 mm version — Öhlins lists each size separately. A bent shaft drags in the head and destroys the seal within hours — replace, never straighten. A shaft is measured by diameter and overall length, and both are specific to the unit it belongs to. Its polished section runs directly in the seal, so any mark there ends the seal's life quickly.\u003c\/p\u003e\u003ch2\u003eOriginal Öhlins Part\u003c\/h2\u003e\u003cp\u003eThe part is identical to what Öhlins fits in production — same supplier, same specification. A damper that can be rebuilt is a damper that stays on the bike; that is the whole argument for original service parts. Service parts are supplied per piece unless the description says otherwise. For a full rebuild, the seal kit plus the wear parts is usually the sensible order.\u003c\/p\u003e\u003ch2\u003eHow to Be Sure It Fits\u003c\/h2\u003e\u003cp\u003e21637-01 is the Öhlins number for this position — the same one printed in the service documentation. The published dimensions are diameter 12 mm, length 393 mm — measure the old part against them if you are unsure. The damper shaft carries the piston and passes through the seal head, so its surface finish decides how long the seals last. A shaft is measured by diameter and overall length, and both are specific to the unit it belongs to.\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 21637-01\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eCategory:\u003c\/em\u003e Damper Shafts\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eDiameter:\u003c\/em\u003e 12 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eLength:\u003c\/em\u003e 393 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":53650756829450,"sku":"21637-01","price":88800.0,"currency_code":"XOF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/21637-01_483c5af1-fdf4-4538-95e2-909886ec9ac3.png?v=1788877371","url":"https:\/\/inter-pace.com\/en-ml\/products\/ohlins-shaft-12-393-alu-21637-01","provider":"Inter-Pace","version":"1.0","type":"link"}