{"product_id":"ohlins-seal-head-front-fork-14-38-5-20-21638-01","title":"Öhlins Seal head front fork 14\/38.5\/20 – 21638-01","description":"\u003cp\u003eSeal head front fork 14\/38.5\/20, Öhlins part number 21638-01. Nitrile, Viton and PTFE behave differently with temperature, and Öhlins picks per position.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eOuter Diameter 38.5 mm\u003c\/li\u003e\n\u003cli\u003eInner Diameter 14 mm\u003c\/li\u003e\n\u003cli\u003eThickness 20 mm\u003c\/li\u003e\n\u003cli\u003eOriginal Öhlins service part\u003c\/li\u003e\n\u003cli\u003eÖhlins part number 21638-01\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat It Is\u003c\/h2\u003e\u003cp\u003eAt 14 mm, 38.5 mm, 20 mm it fits one position only; the next size up carries a different number. The dust seal does the hard work: it keeps the grit that would score the shaft away from the oil seal. Öhlins builds the head so the dust seal takes the grit before it reaches the oil seal. Seal kits gather the pieces one rebuild needs, which avoids a second order mid-job.\u003c\/p\u003e\u003ch2\u003eWhy the Original\u003c\/h2\u003e\u003cp\u003eRebuilding to specification only works if the parts are to specification — that starts here. This is an original Öhlins part, not an aftermarket equivalent — the tolerances are the ones the unit was assembled to. 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\u003eIdentifying the Right Part\u003c\/h2\u003e\u003cp\u003eOrder under 21638-01. Where several sizes share a description, only the number separates them. inner diameter 14 mm, outer diameter 38.5 mm, thickness 20 mm is what distinguishes this number from its neighbours in the range. Cross-section is as important as diameter: an O-ring that is too thin will not seal at pressure. Head diameter and thread are specific to the tube it closes.\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 21638-01\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eCategory:\u003c\/em\u003e Seal Heads\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eInner Diameter:\u003c\/em\u003e 14 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eOuter Diameter:\u003c\/em\u003e 38.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eThickness:\u003c\/em\u003e 20 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":53652641153290,"sku":"21638-01","price":39.55,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/21638-01_9ecf73c9-537c-4c29-a609-6f263cfc4898.png?v=1788879806","url":"https:\/\/inter-pace.com\/en-gr\/products\/ohlins-seal-head-front-fork-14-38-5-20-21638-01","provider":"Inter-Pace","version":"1.0","type":"link"}