{"product_id":"ohlins-piston-m8x1-left-32-45-21973-01","title":"Öhlins Piston M8x1 left\/32\/45 – 21973-01","description":"\u003cp\u003ePiston M8x1 left\/32\/45, Öhlins part number 21973-01. Rebuilding a piston means keeping the shim order, because the stack is the tuning.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eThread M8x1\u003c\/li\u003e\n\u003cli\u003eOriginal Öhlins service part\u003c\/li\u003e\n\u003cli\u003eDimension B 45 mm\u003c\/li\u003e\n\u003cli\u003eDimension A 32 mm\u003c\/li\u003e\n\u003cli\u003eÖhlins part number 21973-01\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFunction\u003c\/h2\u003e\u003cp\u003eThe published figures are 32 mm, 45 mm. Measure the old part against them before ordering. The piston carries the shim stacks and meters the oil; its port layout is what makes an Öhlins damper behave the way it does. Port area and shim seat geometry decide the damping curve before any adjuster is touched. Port area sets how much oil can pass before the shims begin to lift.\u003c\/p\u003e\u003ch2\u003eWhy the Original\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. Öhlins supports its suspension with individual service parts, which is why a fifteen-year-old damper can still be rebuilt to specification. Send us the model and serial number of your unit and we will confirm the position before you order. Ask us before ordering if you are unsure: a wrong part in a pressurised unit is an expensive lesson.\u003c\/p\u003e\u003ch2\u003eHow to Be Sure It Fits\u003c\/h2\u003e\u003cp\u003e21973-01 is the Öhlins number for this position — the same one printed in the service documentation. Check dimension a 32 mm, dimension b 45 mm against what you have removed; a close size is not the same part. Needle geometry sets the shape of the adjustable range, not just its size. Twin-tube pistons have separate paths for compression and rebound, which is the whole point of the design.\u003c\/p\u003e\u003ch2\u003eFitting and Setup Service\u003c\/h2\u003e\u003cp\u003eWe are an authorised Öhlins service centre, so you do not have to source the tools and the nitrogen: send us the damper and we rebuild it with the correct parts and the correct setting.\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 21973-01\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eCategory:\u003c\/em\u003e Pistons\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eDimension A:\u003c\/em\u003e 32 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eDimension B:\u003c\/em\u003e 45 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eThread:\u003c\/em\u003e M8x1\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":53652175683850,"sku":"21973-01","price":1507.0,"currency_code":"EGP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/21973-01_5456dab2-c990-45b9-b490-50e4f312b306.png?v=1788878156","url":"https:\/\/inter-pace.com\/en-eg\/products\/ohlins-piston-m8x1-left-32-45-21973-01","provider":"Inter-Pace","version":"1.0","type":"link"}