{"product_id":"gzyf-12-6-320mm-universal-motorcycle-rear-air-shock-absorbers-nitrogen-charged-adjustable-preload","title":"GZYF 12.6\" (320mm) Universal Motorcycle Rear Air Shock Absorbers — Nitrogen-Charged, Adjustable Preload","description":"\u003cstrong\u003eGZYF 12.6\" (320mm) Universal Motorcycle Rear Air Shock Absorbers are adjustable nitrogen\/air shocks designed to replace or upgrade rear suspension on many 150–750cc street bikes, scooters, mopeds and ATVs.\u003c\/strong\u003e\n\n\u003cp\u003eThese 320mm eye-to-eye rear shocks combine a CNC-machined aluminum reservoir, steel-and-aluminum construction, and adjustable spring preload to deliver improved impact absorption and tunability over basic stock units. They are marketed as a universal fit for motorcycles with a 12.6\" eye-to-eye measurement, making them a practical option for riders seeking enhanced comfort, stability or a visual upgrade.\u003c\/p\u003e\n\n\u003ch3\u003eWill these shocks fit my motorcycle?\u003c\/h3\u003e\n\u003cp\u003eFit depends primarily on the eye-to-eye distance and mounting hardware. Confirm your current shock's center-to-center measurement is 320mm (12.6\") and compare bolt diameters and bracket clearance before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEye-to-eye length: 320mm (12.6\") — primary compatibility factor\u003c\/li\u003e\n  \u003cli\u003eSuitable for many 150cc–750cc street bikes, scooters, mopeds, and some ATVs\u003c\/li\u003e\n  \u003cli\u003eCheck bolt size, mounting angle and clearance at swingarm and frame\u003c\/li\u003e\n  \u003cli\u003eUse as replacement, style upgrade, or for custom bike modifications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these air\/nitrogen shocks change the ride?\u003c\/h3\u003e\n\u003cp\u003eThe combination of a nitrogen-charged damper and a larger external reservoir helps control heat and maintain damping consistency over extended use. That results in smoother absorption of small bumps and better control over larger impacts compared with typical stock shocks.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNitrogen\/air damping reduces cavitation and improves rebound stability\u003c\/li\u003e\n  \u003cli\u003eExternal CNC reservoir increases oil volume and heat dissipation\u003c\/li\u003e\n  \u003cli\u003eFilters minor road imperfections while absorbing heavier hits\u003c\/li\u003e\n  \u003cli\u003eImproved stability during acceleration and braking for safer handling\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat adjustment options are available and why they matter?\u003c\/h3\u003e\n\u003cp\u003eThese shocks include an adjustable spring preload that you change with tools to alter sag and ride firmness. Adjusting preload tailors compression feel during acceleration and changes how the bike sits under load, helping match the shock to different riders, cargo loads or riding styles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTool-adjustable spring preload for quicker tuning\u003c\/li\u003e\n  \u003cli\u003eStiffer preload reduces sag for heavier riders or luggage\u003c\/li\u003e\n  \u003cli\u003eSofter preload improves comfort for lighter riders or smoother roads\u003c\/li\u003e\n  \u003cli\u003ePreload changes complement damping characteristics for balanced performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and build features affect durability?\u003c\/h3\u003e\n\u003cp\u003eThe shocks use a mix of hardened steel components and aluminum alloy parts, plus a CNC-machined reservoir. Those materials balance strength and weight while the larger oil capacity and quality machining promote long-term reliability under regular riding conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid steel body and critical fasteners for structural strength\u003c\/li\u003e\n  \u003cli\u003eAluminum alloy and CNC reservoir for heat dissipation and lightness\u003c\/li\u003e\n  \u003cli\u003ePrecision machining for consistent sealing and performance\u003c\/li\u003e\n  \u003cli\u003eDesigned for replacement and aesthetic upgrade of stock units\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho is this for?\u003c\/strong\u003e The GZYF 12.6\"\/320mm rear air shock absorbers are aimed at riders who need a direct-replacement rear shock with improved damping, tunability and a sportier look. They suit owners of compatible 150–750cc road bikes, scooters, mopeds and quads who want better impact control, the ability to tune spring preload, and a durable reservoir-style design for longer, more consistent performance. Always verify your motorcycle's eye-to-eye measurement and mounting compatibility before purchase.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What is the required eye-to-eye length for fit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: You need a 320mm (12.6\") eye-to-eye measurement; verify center-to-center before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I adjust the shock firmness?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — spring preload is tool-adjustable to change sag and ride firmness for different loads.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GZYF","offers":[{"title":"Default Title","offer_id":55171086156119,"sku":"B08SHXL7HM","price":119.61,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/gzyf-front-view-rear-shock.jpg?v=1790437928","url":"https:\/\/britishgarage.co.uk\/products\/gzyf-12-6-320mm-universal-motorcycle-rear-air-shock-absorbers-nitrogen-charged-adjustable-preload","provider":"British Garage","version":"1.0","type":"link"}