{"product_id":"ohlins-o-ring-21-20x1-78-nbr70-00438-03","title":"Öhlins O-ring 21.20x1.78 NBR70 – 00438-03","description":"\u003cp\u003eO-ring 21.20x1.78 NBR70, Öhlins part number 00438-03. Öhlins recommends replacing seals whenever the unit is opened, not only when it leaks.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eÖhlins part number 00438-03\u003c\/li\u003e\n\u003cli\u003eMaterial NBR 70\u003c\/li\u003e\n\u003cli\u003eOriginal Öhlins service part\u003c\/li\u003e\n\u003cli\u003eCross Section 1.78 mm\u003c\/li\u003e\n\u003cli\u003eInner Diameter 21.20 mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhere It Sits\u003c\/h2\u003e\u003cp\u003eThis one measures 21.20 mm, 1.78 mm, NBR 70, and those figures are what separate it from the neighbouring numbers. Öhlins uses seals with a spring-loaded lip so they follow the shaft as it wears. Cross-section is as important as diameter: an O-ring that is too thin will not seal at pressure. A leaking damper is not a cosmetic problem: it is a damper that has stopped controlling the wheel.\u003c\/p\u003e\u003ch2\u003eOriginal Öhlins Part\u003c\/h2\u003e\u003cp\u003eAn original part keeps the unit within its published specification; a near-equivalent quietly moves it. The alternative to a service part is usually a new damper, which is why this catalogue exists. Send us the model and serial number of your unit and we will confirm the position before you order. Service parts are supplied per piece unless the description says otherwise.\u003c\/p\u003e\u003ch2\u003eHow to Be Sure It Fits\u003c\/h2\u003e\u003cp\u003eÖhlins identifies this position by the number 00438-03 in the exploded view for the unit it belongs to. Öhlins states inner diameter 21.20 mm, cross section 1.78 mm, material NBR 70 for this number, and those figures are the deciding ones. Seal heads combine the oil seal, the dust seal and the bushing in one assembly. Size is given as inner diameter and cross-section; a close size is not a match.\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 00438-03\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eCategory:\u003c\/em\u003e O-Rings\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eInner Diameter:\u003c\/em\u003e 21.20 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eCross Section:\u003c\/em\u003e 1.78 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eMaterial:\u003c\/em\u003e NBR 70\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":53646898921738,"sku":"00438-03","price":8000.0,"currency_code":"PYG","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/00438-03_b3fb1d4a-e141-4aa0-aba9-b2ec0a6c6759.png?v=1788869365","url":"https:\/\/inter-pace.com\/en-py\/products\/ohlins-o-ring-21-20x1-78-nbr70-00438-03","provider":"Inter-Pace","version":"1.0","type":"link"}