SPL Parts sppSPL RKB FRS Rear Spherical Knuckle Bushing

The SPL rear knuckle bushings replace the rubber factory knuckle bushing with a low friction PTFE-lined spherical bearing. Replacing the OEM rubber bushing eliminates deflection under heavy acceleration and braking loads that leads to unwanted geometry changes, and prevents binding by allowing the knuckle to smoothly articulate. The reduced deflection also translates to improved driver feedback from the tire and better overall response. We use the largest possible FK bearing, to increase longevity and reduce NVH, mounted in a 6061-T6 aluminum housing precision cut with +/- .001" tolerance to insure proper fitment. Benefits Lightweight: 0.674 lbs (306g) / 0.337 lbs (153g) per Side Improves Throttle and Braking Response Reduced Wheel Hop Maintenance-Free, US Made, PTFE-Lined FK Bearings Materials 6061-T6 Aluminum Bearing Shells Steel PTFE-lined FK Spherical Bearings SPL FR-S / BRZ / GT86 / GR86 / VA WRX/STI Rear Knuckle Spherical Bushing

• Proudly made, engineered, and assembled in the USA.

The SPL Parts rear knuckle bushing replaces the factory rubber knuckle bushing with a low-friction, PTFE-lined spherical bearing. By reducing deflection under heavy acceleration and braking loads, it helps limit unwanted geometry changes while allowing the knuckle to articulate smoothly without binding. The result is improved tire feedback, throttle and braking response, and overall vehicle response.

The assembly uses a large FK spherical bearing for longevity and reduced noise, vibration, and harshness. The bearing is housed in a precision-cut 6061-T6 aluminum shell with a stated tolerance of +/- 0.001 inches for proper fitment. The lightweight design weighs 0.674 lb total, or 0.337 lb per side. SPL Parts states that the component is maintenance-free and made, engineered, and assembled in the USA.

Key Features & Performance Benefits

• Low-friction PTFE-lined spherical bearing helps prevent binding.
• Reduced bushing deflection helps maintain suspension geometry during acceleration and braking.
• Improves throttle and braking response, tire feedback, and overall response.
• May reduce wheel hop while providing a lightweight, maintenance-free design.

Specifications & Technical Data

• Brand: SPL Parts
• Part Number: sppSPL RKB FRS
• Application: Rear knuckle spherical bushing
• Bearing type: PTFE-lined FK spherical bearing
• Bearing shell material: 6061-T6 aluminum
• Bearing material: Steel with PTFE lining
• Weight: 0.674 lb total; 0.337 lb per side
• Manufacturing: Made, engineered, and assembled in the USA

What's Included

The product data identifies one unit per SKU. Specific box contents are not otherwise provided.

Fitment

Fits 2013–2015 Scion FR-S and Subaru BRZ applications listed in the product data. The product name also identifies Subaru WRX, Toyota 86, and GR86 applications, but specific model years are not provided.

Fitments:
2013 Scion FR-S Base
2013 Subaru BRZ Limited
2013 Subaru BRZ Premium
2014 Scion FR-S Base
2014 Subaru BRZ Limited
2014 Subaru BRZ Premium
2015 Scion FR-S Base
2015 Subaru BRZ Limited
2015 Subaru BRZ Premium
2015 Subaru BRZ Series.Blue
2015 Subaru WRX Base
2015 Subaru WRX Limited
2015 Subaru WRX Premium
2015 Subaru WRX STI Base
2015 Subaru WRX STI Launch Edition
2015 Subaru WRX STI Limited
2016 Scion FR-S Base
2016 Subaru BRZ Limited
2016 Subaru BRZ Premium
2016 Subaru BRZ Series.HyperBlue
2016 Subaru WRX Base
2016 Subaru WRX Limited
2016 Subaru WRX Premium
2016 Subaru WRX STI Base
2016 Subaru WRX STI Limited
2016 Subaru WRX STI Series.HyperBlue
2017 Subaru BRZ Limited
2017 Subaru BRZ Premium
2017 Subaru BRZ Series.Yellow
2017 Subaru WRX Base
2017 Subaru WRX Limited
2017 Subaru WRX Premium
2017 Subaru WRX STI Base
2017 Subaru WRX STI Limited
2017 Toyota 86 Base
2017 Toyota 86 Special Edition
2018 Subaru BRZ Limited
2018 Subaru BRZ Premium
2018 Subaru BRZ TS
2018 Subaru WRX Base
2018 Subaru WRX Limited
2018 Subaru WRX Premium
2018 Subaru WRX STI Base
2018 Subaru WRX STI Limited
2018 Subaru WRX STI Type RA
2018 Toyota 86 Base
2018 Toyota 86 GT
2019 Subaru BRZ Limited
2019 Subaru BRZ Premium
2019 Subaru BRZ Series.Gray
2019 Subaru WRX Base
2019 Subaru WRX Limited
2019 Subaru WRX Premium
2019 Subaru WRX STI Base
2019 Subaru WRX STI Limited
2019 Subaru WRX STI S209
2019 Toyota 86 Base
2019 Toyota 86 GT
2019 Toyota 86 TRD Special Edition
2020 Subaru BRZ Limited
2020 Subaru BRZ TS
2020 Subaru WRX Base
2020 Subaru WRX Limited
2020 Subaru WRX Premium
2020 Subaru WRX STI Base
2020 Subaru WRX STI Limited
2020 Toyota 86 Base
2020 Toyota 86 GT
2020 Toyota 86 Hakone Edition
2021 Subaru WRX Base
2021 Subaru WRX Limited
2021 Subaru WRX Premium
2021 Subaru WRX STI Base
2021 Subaru WRX STI Limited
2022 Subaru WRX Base
2022 Subaru WRX GT
2022 Subaru WRX Limited
2022 Subaru WRX Premium
2022 Toyota GR86 Base
2022 Toyota GR86 Premium
2023 Subaru WRX Base
2023 Subaru WRX GT
2023 Subaru WRX Limited
2023 Subaru WRX Premium
2023 Toyota GR86 10th Anniversary Special Edition
2023 Toyota GR86 Base
2023 Toyota GR86 Premium
2024 Subaru WRX Base
2024 Subaru WRX GT
2024 Subaru WRX Limited
2024 Subaru WRX Premium
2024 Subaru WRX TR
2024 Toyota GR86 Base
2024 Toyota GR86 Premium
2024 Toyota GR86 TRUENO Edition
2025 Subaru BRZ Limited
2025 Subaru BRZ Premium
2025 Subaru BRZ TS
2025 Subaru WRX GT
2025 Subaru WRX Limited
2025 Subaru WRX Premium
2025 Subaru WRX TS
2025 Toyota GR86 Base
2025 Toyota GR86 Hakone Edition
2025 Toyota GR86 Premium
2026 Toyota GR86 Base
2026 Toyota GR86 Premium
2026 Toyota GR86 Yuzu Edition

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1