{"product_id":"ohlins-shock-spring-75-n-mm-240-mm-51-mm-21079-21","title":"Öhlins Shock Spring 75 N\/mm \/ 240 mm \/ Ø 51 mm – 21079-21","description":"\u003cp\u003eÖhlins part number 21079-21 is a shock absorber spring rated at 75 N\/mm, 240 mm long with a 51 mm inner diameter. A rear spring matched to rider and load keeps the chassis attitude where the factory intended it.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFree length 240 mm\u003c\/li\u003e\n\u003cli\u003eÖhlins part number 21079-21\u003c\/li\u003e\n\u003cli\u003eMeasured spring rate 75 N\/mm\u003c\/li\u003e\n\u003cli\u003eInner diameter 51 mm\u003c\/li\u003e\n\u003cli\u003ePowder-coated yellow\u003c\/li\u003e\n\u003cli\u003e115 mm of usable stroke\u003c\/li\u003e\n\u003cli\u003eStraight-wound, constant rate\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eHow Öhlins Makes Them\u003c\/h2\u003e\u003cp\u003eEvery unit is dyno-tested against the curve held for its part number, not sampled from a batch. Öhlins winds, heat-sets and then measures every spring individually — the rate on the label is the rate you get. Seals are specified for temperature stability rather than for the lowest unit cost.\u003c\/p\u003e\u003ch2\u003eThe Numbers That Matter\u003c\/h2\u003e\u003cp\u003eThe 51 mm bore and 240 mm length are the two figures that decide whether it physically fits; 75 N\/mm decides whether it suits the rider.\u003c\/p\u003e\u003ch2\u003eWhere This Rate Belongs\u003c\/h2\u003e\u003cp\u003eA firm rate keeps the fork high in its stroke under braking, which preserves the geometry when the front is loaded hard. A firm rate holds the chassis attitude when the front or rear is loaded hard. Firm rates also suit machines carrying luggage as a matter of course. Road surfaces are the hardest test of a spring rate, because the fork has to cope with both a smooth stretch and a broken one.\u003c\/p\u003e\u003ch2\u003eWhat the Rear Spring Decides\u003c\/h2\u003e\u003cp\u003eOn a linkage-equipped machine the wheel moves several millimetres for every millimetre the damper moves, and the spring rate has to account for that ratio. Öhlins sells rear springs separately precisely because rider weight varies more than machine weight does. Progressive springs change rate through the stroke, which suits machines with little travel and a lot of load.\u003c\/p\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cp\u003eThis is a service part in the proper sense — it wears, it settles, and replacing it restores what the suspension was designed to do. The safest way to choose is by static sag: set the target figure, and the rate follows from whether you can reach it with preload. Öhlins lists no fixed model here — the spring is defined by its measurements, and any fork with matching dimensions can take it.\u003c\/p\u003e\u003ch2\u003eFitting\u003c\/h2\u003e\u003cp\u003eThe job needs no special tools beyond a fork spring compressor and a measuring rod for the oil level. Öhlins part numbers are stamped on the packaging rather than the spring, so keep the label with the setup notes. Torque the fork caps to the manufacturer's figure; the springs change nothing about the assembly torque.\u003c\/p\u003e\u003ch2\u003eRoad Approval\u003c\/h2\u003e\u003cp\u003eRoad approval: a spring is a like-for-like replacement of a wear part and carries no separate type approval. Where Öhlins states an approval for a particular motorcycle, it is named under Applications.\u003c\/p\u003e\u003ch2\u003eFitting and Setup Service\u003c\/h2\u003e\u003cp\u003eFitting matters as much as the part. We are an authorised Öhlins service centre and carry out installation, servicing and setup ourselves — get in touch and we will arrange it alongside your order.\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 21079-21\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eSpring Rate:\u003c\/em\u003e 75 N\/mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eFree Length:\u003c\/em\u003e 240 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eInner Diameter:\u003c\/em\u003e 51 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eStroke:\u003c\/em\u003e 115 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eConstruction:\u003c\/em\u003e Straight\u003c\/li\u003e\n\u003cli\u003e\n\u003cem\u003eFinish:\u003c\/em\u003e Powder-coated yellow\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":53645411746058,"sku":"21079-21","price":116.46,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/RearOhlinsSpring_46785c84-afd1-478c-bc39-702212c6fb66.png?v=1788866878","url":"https:\/\/inter-pace.com\/products\/ohlins-shock-spring-75-n-mm-240-mm-51-mm-21079-21","provider":"Inter-Pace","version":"1.0","type":"link"}