{"product_id":"eibach-coilover-race-springs-3-75-id","title":"Eibach Coilover Spring – 3.75″ ID","description":"\u003cp class=\"p1\"\u003eThe Eibach 3.75\" I.D. Coilover Spring is designed specifically for 3.0 coilover shocks used in high-performance off-road suspension systems. Built to deliver consistent spring rates, predictable handling, and long service life, these springs are commonly found on rock crawlers, rock bouncers, Ultra4 race cars, desert race trucks, prerunners, trail rigs, and custom tube chassis vehicles. Available in multiple spring lengths and spring rates, Eibach springs allow builders to properly tune ride height, suspension travel, weight transfer, and overall vehicle performance.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eEngineered as part of the Eibach Racing Off-Road (ERO) spring system, these springs are manufactured from premium spring steel and designed to maintain accurate spring rates even under extreme suspension loads and repeated cycling. The lightweight design maximizes available suspension travel while minimizing block height, making them ideal for both single-rate and dual-rate coilover setups. Whether you're tuning a competition vehicle or building a reliable trail machine, Eibach coilover springs provide the consistency and durability serious off-road suspension systems demand.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cb\u003eIncludes\u003c\/b\u003e\u003c\/p\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li1\"\u003e(1) Eibach 3.75\" I.D. Coilover Spring\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eSelected Spring Rate\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eSelected Spring Length\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eSold Individually\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary class=\"details__header\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003eBrand: \u003c\/b\u003eEibach\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003eInside Diameter: \u003c\/b\u003e3.75\"\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003e3.75″ ID Length Range:\u003c\/b\u003e 10\" - 18\"\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003eSpring Rates Available: \u003c\/b\u003e100 lb\/in – 500 lb\/in\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003eFinish: \u003c\/b\u003eSilver Powder Coat\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003eSpring Type: \u003c\/b\u003eCoilover Suspension Spring\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003eCompatible with: \u003c\/b\u003e3.0\" Coilover Shocks\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003eSuitable for: \u003c\/b\u003eSingle-Rate and Dual-Rate Coilover Systems\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003eDesigned for: \u003c\/b\u003eOff-Road and Racing Applications\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003eDesign: \u003c\/b\u003eRace-Proven ERO (Eibach Racing Off-Road)\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003eMaterial\u003c\/b\u003e: Chrome Silicon Steel (CrS)\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003eManufacturing Process:\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li1\"\u003eCold Wound\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eHeat Treated\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eShot Peened\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003eEnds:\u003c\/b\u003e Squared \u0026amp; Ground at Both Ends\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\n\u003cb\u003eCoating:\u003c\/b\u003e Protective Silver Powder Coat\u003c\/li\u003e\n\u003cli class=\"li1\"\u003e\u003cb\u003eIndividually Rate Tested\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary class=\"details__header\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003cp\u003e\u003cstrong\u003eUniversal fitment for:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li1\"\u003eFits 3.0 Coilover Shock Applications\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eCompatible with most 3.0 off-road coilover shocks utilizing 3.75\" I.D. springs\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eCommonly used on:\u003c\/li\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li1\"\u003eRock Crawlers\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eRock Bouncers\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eUltra4 Cars\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eDesert Race Trucks\u003c\/li\u003e\n\u003cli class=\"li1\"\u003ePrerunners\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eTrail Rigs\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eTube Chassis Buggies\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eCustom Off-Road Vehicles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eVerify spring length, spring rate, and hardware compatibility before ordering.\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary class=\"details__header\"\u003e\u003cstrong\u003eTech Insight\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eWhat shocks are these springs designed for?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThese springs are designed for 3.0 coilover shocks that utilize a 3.75\" inside diameter spring.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eWhat does 3.75\" I.D. mean?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe 3.75\" I.D. measurement refers to the inside diameter of the spring. This must match the spring hardware and coilover shock configuration being used.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eHow do I choose the correct spring rate?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eSpring rate selection depends on vehicle weight, suspension geometry, motion ratio, ride height goals, and intended use. Heavier vehicles generally require higher spring rates, while lighter vehicles often perform best with softer rates. You can watch our tutorial on \u003ca rel=\"noopener\" href=\"https:\/\/wideopendesign.com\/blogs\/tech-videos\/mastering-the-math-how-to-calculate-spring-rates-without-a-scale\" target=\"_blank\"\u003eCalculating Spring Rates\u003c\/a\u003e for more information.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eCan these be used in a dual-rate coilover setup?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eYes. Eibach 3.75\" coilover springs are commonly used in both single-rate and dual-rate suspension systems and are popular in custom off-road suspension applications.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eAre these springs sold individually or in pairs?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThese springs are sold individually. Most vehicles require two springs per axle or four springs for a complete dual-rate coilover suspension system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre Eibach Off-Road Coilover Springs durable?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. ERO springs are engineered to maintain rate and free length even after repeated full compression cycles. They are designed to handle:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExtreme suspension cycling\u003c\/li\u003e\n\u003cli\u003eHigh heat environments\u003c\/li\u003e\n\u003cli\u003eHeavy unsprung weight\u003c\/li\u003e\n\u003cli\u003eContinuous race abuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAre these coilover springs block-stable?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. In dual-rate setups, the tender spring is often designed to fully compress (block) to transition into the main spring. ERO springs are built to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSafely block repeatedly\u003c\/li\u003e\n\u003cli\u003eMaintain consistent transition points\u003c\/li\u003e\n\u003cli\u003eResist sagging or rate loss\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e","brand":"Eibach","offers":[{"title":"10\" \/ 100lb\/in.","offer_id":56641907785894,"sku":"EIB1000.375.0100S","price":121.0,"currency_code":"USD","in_stock":true},{"title":"10\" \/ 150lb\/in.","offer_id":56641907818662,"sku":"EIB1000.375.0150S","price":121.0,"currency_code":"USD","in_stock":true},{"title":"10\" \/ 200lb\/in.","offer_id":56641907851430,"sku":"EIB1000.375.0200S","price":121.0,"currency_code":"USD","in_stock":true},{"title":"10\" \/ 250lb\/in.","offer_id":56641907884198,"sku":"EIB1000.375.0250S","price":121.0,"currency_code":"USD","in_stock":true},{"title":"10\" \/ 300lb\/in.","offer_id":56641907916966,"sku":"EIB1000.375.0300S","price":121.0,"currency_code":"USD","in_stock":true},{"title":"10\" \/ 350lb\/in.","offer_id":56641907949734,"sku":"EIB1000.375.0350S","price":121.0,"currency_code":"USD","in_stock":true},{"title":"10\" \/ 400lb\/in.","offer_id":56641907982502,"sku":"EIB1000.375.0400S","price":121.0,"currency_code":"USD","in_stock":true},{"title":"10\" \/ 450lb\/in.","offer_id":56641908015270,"sku":"EIB1000.375.0450S","price":121.0,"currency_code":"USD","in_stock":true},{"title":"10\" \/ 500lb\/in.","offer_id":56641908048038,"sku":"EIB1000.375.0500S","price":121.0,"currency_code":"USD","in_stock":true},{"title":"14\" \/ 100lb\/in.","offer_id":56641908080806,"sku":"EIB1400.375.0100S","price":130.0,"currency_code":"USD","in_stock":true},{"title":"14\" \/ 150lb\/in.","offer_id":56641908113574,"sku":"EIB1400.375.0150S","price":130.0,"currency_code":"USD","in_stock":true},{"title":"14\" \/ 200lb\/in.","offer_id":56641908146342,"sku":"EIB1400.375.0200S","price":130.0,"currency_code":"USD","in_stock":true},{"title":"14\" \/ 250lb\/in.","offer_id":56641908179110,"sku":"EIB1400.375.0250S","price":130.0,"currency_code":"USD","in_stock":true},{"title":"14\" \/ 300lb\/in.","offer_id":56641908211878,"sku":"EIB1400.375.0300S","price":130.0,"currency_code":"USD","in_stock":true},{"title":"14\" \/ 350lb\/in.","offer_id":56641908244646,"sku":"EIB1400.375.0350S","price":130.0,"currency_code":"USD","in_stock":true},{"title":"14\" \/ 400lb\/in.","offer_id":56641908277414,"sku":"EIB1400.375.0400S","price":130.0,"currency_code":"USD","in_stock":true},{"title":"14\" \/ 450lb\/in.","offer_id":56641908310182,"sku":"EIB1400.375.0450S","price":130.0,"currency_code":"USD","in_stock":true},{"title":"14\" \/ 500lb\/in.","offer_id":56641908342950,"sku":"EIB1400.375.0500S","price":130.0,"currency_code":"USD","in_stock":true},{"title":"16\" \/ 200lb\/in.","offer_id":56641908441254,"sku":"EIB1600.375.0200S","price":160.0,"currency_code":"USD","in_stock":true},{"title":"16\" \/ 250lb\/in.","offer_id":56641908474022,"sku":"EIB1600.375.0250S","price":160.0,"currency_code":"USD","in_stock":true},{"title":"16\" \/ 300lb\/in.","offer_id":56641908506790,"sku":"EIB1600.375.0300S","price":160.0,"currency_code":"USD","in_stock":true},{"title":"16\" \/ 350lb\/in.","offer_id":56641908539558,"sku":"EIB1600.375.0350S","price":160.0,"currency_code":"USD","in_stock":true},{"title":"16\" \/ 400lb\/in.","offer_id":56641908572326,"sku":"EIB1600.375.0400S","price":160.0,"currency_code":"USD","in_stock":true},{"title":"16\" \/ 450lb\/in.","offer_id":56641908605094,"sku":"EIB1600.375.0450S","price":160.0,"currency_code":"USD","in_stock":true},{"title":"16\" \/ 500lb\/in.","offer_id":56641908637862,"sku":"EIB1600.375.0500S","price":160.0,"currency_code":"USD","in_stock":true},{"title":"18\" \/ 200lb\/in.","offer_id":56641908736166,"sku":"EIB1800.375.0200S","price":160.0,"currency_code":"USD","in_stock":true},{"title":"18\" \/ 250lb\/in.","offer_id":56641908768934,"sku":"EIB1800.375.0250S","price":160.0,"currency_code":"USD","in_stock":true},{"title":"18\" \/ 300lb\/in.","offer_id":56641908801702,"sku":"EIB1800.375.0300S","price":160.0,"currency_code":"USD","in_stock":true},{"title":"18\" \/ 350lb\/in.","offer_id":56641908834470,"sku":"EIB1800.375.0350S","price":160.0,"currency_code":"USD","in_stock":true},{"title":"18\" \/ 400lb\/in.","offer_id":56641908867238,"sku":"EIB1800.375.0400S","price":160.0,"currency_code":"USD","in_stock":true},{"title":"18\" \/ 450lb\/in.","offer_id":56641908900006,"sku":"EIB1800.375.0450S","price":160.0,"currency_code":"USD","in_stock":true},{"title":"18\" \/ 500lb\/in.","offer_id":56641908932774,"sku":"EIB1800.375.0500S","price":160.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8394\/6406\/files\/10-eibach-ers-silver-short_738c0b5f-a299-4d28-b902-9b30a006927c.webp?v=1781215667","url":"https:\/\/wideopendesign.com\/products\/eibach-coilover-race-springs-3-75-id","provider":"Wide Open Design","version":"1.0","type":"link"}