{"product_id":"spl-parts-performance-rear-knuckle-bushings-gr86-brz-fr-s-86-wrx","title":"SPL Parts Performance Rear Knuckle Bushings – GR86 \/ BRZ \/ FR-S \/ 86 \/ WRX","description":"\u003cp\u003eThe \u003cstrong\u003eSPL Parts Rear Knuckle Bushings\u003c\/strong\u003e replace the factory rubber rear knuckle bushings with low-friction, PTFE-lined spherical bearings. By eliminating rubber bushing deflection under heavy acceleration and braking loads, these bushings help reduce unwanted geometry changes, improve response, and give the driver more direct feedback from the rear tires.\u003c\/p\u003e\n\n  \u003cp\u003eFactory rubber bushings are designed with comfort and compliance in mind, but that compliance can lead to wheel hop, vague feedback, and inconsistent suspension behavior when the car is driven hard. SPL uses the largest possible FK spherical bearing mounted in a precision-machined 6061-T6 aluminum housing for improved longevity, proper fitment, and sharper rear suspension articulation.\u003c\/p\u003e\n\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eReplaces Factory Rubber Bushings:\u003c\/strong\u003e Eliminates deflection from the OEM rear knuckle bushing location.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eImproves Throttle \u0026amp; Braking Response:\u003c\/strong\u003e Reduces unwanted geometry changes under acceleration and braking loads.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eReduces Wheel Hop:\u003c\/strong\u003e Helps the rear suspension stay more controlled under load.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eImproves Driver Feedback:\u003c\/strong\u003e More direct rear tire feedback and sharper overall response.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePTFE-Lined FK Bearings:\u003c\/strong\u003e Maintenance-free, US-made spherical bearings for low-friction articulation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePrecision-Machined Housing:\u003c\/strong\u003e 6061-T6 aluminum bearing shells cut to +\/- .001\" tolerance for proper fitment.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLightweight Construction:\u003c\/strong\u003e Approximately 0.674 lbs per pair \/ 0.337 lbs per side.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSold as a Pair:\u003c\/strong\u003e Includes one pair of rear knuckle bushings for one vehicle.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWhy We Like It\u003c\/h3\u003e\n  \u003cp\u003eThese are a serious suspension precision upgrade for drivers who want the rear of the car to feel more connected and predictable. By removing the soft factory bushing from the rear knuckle, the suspension can articulate more smoothly while reducing deflection under load. For track cars, autocross builds, or aggressive street setups, this helps the rear end feel sharper and more consistent.\u003c\/p\u003e\n\n  \u003ch3\u003eBenefits\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eImproved throttle response\u003c\/li\u003e\n    \u003cli\u003eImproved braking response\u003c\/li\u003e\n    \u003cli\u003eReduced wheel hop\u003c\/li\u003e\n    \u003cli\u003eReduced unwanted geometry change from bushing deflection\u003c\/li\u003e\n    \u003cli\u003eImproved rear suspension articulation\u003c\/li\u003e\n    \u003cli\u003eBetter rear tire feedback\u003c\/li\u003e\n    \u003cli\u003eMaintenance-free spherical bearing design\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eMaterials \u0026amp; Construction\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBearing Shells:\u003c\/strong\u003e 6061-T6 aluminum\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBearings:\u003c\/strong\u003e Steel PTFE-lined FK spherical bearings\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHousing Tolerance:\u003c\/strong\u003e Precision cut to +\/- .001\"\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.674 lbs \/ 306g per pair\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWeight Per Side:\u003c\/strong\u003e 0.337 lbs \/ 153g\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eNVH Notes\u003c\/h3\u003e\n  \u003cp\u003eThe SPL rear knuckle bushings are a moderate contributor to added noise, vibration, and harshness. Because this bushing location helps absorb vibration from potholes, rough pavement, and road irregularities, replacing the OEM rubber bushing with a spherical bearing reduces longitudinal suspension compliance.\u003c\/p\u003e\n\n  \u003cp\u003eWhen combined with spherical traction arms, these bushings may add a similar level of NVH as the traction arms. When combined with solid subframe bushings, longitudinal bushing deflection is largely eliminated, which can result in a noticeable increase in NVH over rough roads. Larger tires with taller sidewalls, lower tire pressures, and high-quality shocks can help improve comfort.\u003c\/p\u003e\n\n  \u003ch3\u003eConfirmed Fitment\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e2022–2026 Toyota GR86\u003c\/li\u003e\n    \u003cli\u003e2013–2021 Toyota 86 \/ GT86\u003c\/li\u003e\n    \u003cli\u003e2013–2016 Scion FR-S\u003c\/li\u003e\n    \u003cli\u003e2013–2026 Subaru BRZ\u003c\/li\u003e\n    \u003cli\u003e2015–2021 Subaru WRX \/ WRX STI, including Type RA\u003c\/li\u003e\n    \u003cli\u003e2022–2026 Subaru WRX\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eReplaces OEM Part Numbers\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eToyota SU003-00366\u003c\/li\u003e\n    \u003cli\u003eSubaru 20254-CA000\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eSpecifications\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e SPL Parts\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Rear Knuckle Bushings\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Rear knuckle\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBushing Type:\u003c\/strong\u003e PTFE-lined spherical bearing\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e Pair, one pair per vehicle\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e GR86, BRZ, FR-S, 86, WRX, and WRX STI\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eProfessional installation is recommended.\u003c\/li\u003e\n    \u003cli\u003eFactory rubber bushings must be removed and replaced with the SPL spherical bearing assemblies.\u003c\/li\u003e\n    \u003cli\u003eSpecialty bushing removal\/installation tools or a press may be required.\u003c\/li\u003e\n    \u003cli\u003eA full alignment is recommended after installation.\u003c\/li\u003e\n    \u003cli\u003eRefer to SPL’s GR86 \/ BRZ \/ GT86 \/ FT86 \/ WRX rear knuckle bushing installation instructions before installation.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWhat’s in the Box\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e(1) Pair of SPL Parts Rear Knuckle Bushings\u003c\/li\u003e\n    \u003cli\u003eIncluded SPL components per kit contents\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eCompatibility \u0026amp; Disclaimers\u003c\/h3\u003e\n  \u003cp\u003eDesigned for compatible Toyota GR86, Toyota 86, Scion FR-S, Subaru BRZ, Subaru WRX, and Subaru WRX STI applications. Sold as one pair per vehicle. These bushings may increase NVH compared to factory rubber bushings. Suspension feel, wheel hop reduction, and handling results may vary depending on tire setup, alignment, ride height, traction arms, subframe bushings, shocks, and intended vehicle use. OEM part number references are provided for general compatibility guidance only, as manufacturers may revise part numbers over time.\u003c\/p\u003e","brand":"SPL Parts","offers":[{"title":"Default Title","offer_id":49161468346616,"sku":"SPL RKB FRS","price":149.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0732\/3457\/9704\/files\/SPL-RKB-FRS-L1-0-Rear-Knuckle-Bushing-HiRes-091123__76022.1724109068.jpg?v=1781794011","url":"https:\/\/driven.media\/products\/spl-parts-performance-rear-knuckle-bushings-gr86-brz-fr-s-86-wrx","provider":"Driven.Media","version":"1.0","type":"link"}