What happens to the rear sway bar if the endlinks have preload on a lowered F2X or F3X?

When a rear sway bar endlink has preload, the bar is already twisted at rest and applying force on the endlink bolt; removal is difficult because of the constant load on the hardware, and installation requires manually twisting the bar to align with the endlink at ride height. More importantly, the preloaded bar introduces a baseline roll stiffness bias that favors one side of the car, making the handling response asymmetric between left and right turns. Adjustable endlinks allow the length to be set to the exact value that produces zero preload at ride height, restoring a neutral, symmetric rear balance.

Does the SPL RE F3X fit all F2X and F3X model variants?

Yes. One part number covers all F2X and F3X models from 2010-2019, including the F20, F21, F22, F23, F30, F31, F32, F33, F34, F35, and F36. This covers 1 Series, 2 Series, 3 Series, and 4 Series coupe, sedan, wagon, convertible, and Gran Coupe body styles within those ranges.

Why do the Chromoly High Misalignment Studs make a difference over standard ball studs at the sway bar?

Standard ball studs typically provide 15 to 20 degrees of articulation. At the factory sway bar adjustment hole position, that is sufficient. When an aftermarket rear sway bar uses a stiffer adjustment hole that moves the connection angle away from factory geometry, a standard stud approaches or exceeds its articulation limit and begins to bind, restricting bar movement and accelerating joint wear. The 65-degree Chromoly High Misalignment Studs on the RE F3X articulate freely at every hole position without restriction, allowing the bar to perform at its full rated stiffness at any setting.

What warranty does SPL Parts provide on the RE F3X?

SPL Parts backs this product with a 10-year/100,000-mile warranty against defects in material and workmanship from the date of purchase. If the product fails to meet specifications within that period, SPL Parts will repair, replace, or make appropriate adjustment at their discretion.

Can replacement rod ends be ordered if one wears out?

Yes. SPL Parts offers replacement rod ends for the RE F3X. Contact SPL Parts directly through their website for the correct replacement part for your specific endlink.

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Description

SPL Parts Adjustable Rear Sway Bar Endlinks for F2x / F3x BMW 1, 2, 3, and 4 Series

The SPL Parts RE F3X eliminates that problem. Each endlink is independently adjustable in length through the black anodized 6061-T6 aluminum turnbuckle with left and right hand threaded rod ends, so the length on each side can be set precisely to zero preload at whatever the car’s current ride height happens to be; whether that’s factory, lowered, or after corner weighting. Setting zero preload on both sides means the rear sway bar starts from a neutral, symmetric position and only loads in proportion to body roll. The connection quality matches the purpose. Teflon-lined FK 1/2-inch bearings at the shock mount end transmit rear sway bar force directly without rubber deflection, delivering the bar’s full rated stiffness to the chassis. Heat-treated Chromoly High Misalignment Studs at the sway bar connection provide 65 degrees of articulation, which covers every adjustment hole position on any aftermarket rear sway bar without binding. Standard studs with limited articulation range begin to bind at non-factory angles, restricting the bar and accelerating wear; the 65-degree Chromoly studs eliminate that failure mode across the full range of positions. SPL Parts backs this product with a 10-year/100,000-mile warranty from the date of purchase.

Features

Teflon-lined FK 1/2-inch bearings at the shock mount connection; highest load capacity for this application; eliminates rubber deflection under rear sway bar load
Heat-treated Chromoly High Misalignment Studs at the sway bar connection; 65° articulation prevents binding at any adjustment hole position on any aftermarket rear sway bar
Black anodized 6061-T6 aluminum turnbuckle with left and right hand threaded rod ends; each side independently adjustable for precise zero-preload setup
Eliminates rear sway bar preload from ride height variation, spring settling, and corner weight differences; symmetric rear roll stiffness from the first corner
Backed by SPL Parts’ 10-year/100,000-mile warranty from the date of purchase
Suitable for street and race applications
Made in the USA;

Specifications

Body Material: 6061-T6 black anodized aluminum turnbuckle
Heim Joint: 1/2″ Teflon-lined FK USA spherical bearings
Studs: Heat-treated chromoly, 65° high misalignment
Adjustment: Length adjustable for preload elimination
Origin: Made in the USA

Applications

BMW 116d: F20, F21 | 2012-2019
BMW 118d: F20, F21 | 2012-2019
BMW 120d: F20, F21 | 2012-2019
BMW 125d: F20, F21 | 2012-2019
BMW 128ti: F20, F21 | 2019-2019
BMW 114i: F20, F21 | 2012-2019
BMW 116i: F20, F21 | 2012-2019
BMW 118i: F20, F21 | 2012-2019
BMW 120i: F20, F21 | 2012-2019
BMW 125i: F20, F21 | 2012-2019
BMW 135i: F20, F21 | 2012-2016
BMW 220i: F22, F23 | 2014-2021
BMW 220d: F22, F23 | 2014-2021
BMW 225d: F22, F23 | 2014-2021
BMW 228i: F22, F23 | 2014-2016
BMW 230i: F22, F23 | 2016-2021
BMW 240i: F22, F23 | 2016-2021
BMW 316d: F30, F31 | 2012-2019
BMW 318d: F30, F31 | 2012-2019
BMW 320d: F30, F31 | 2012-2019
BMW 325d: F30, F31 | 2012-2019
BMW 330d: F30, F31 | 2012-2019
BMW 335d: F30, F31 | 2012-2019
BMW 330e: F30, F31 | 2015-2019
BMW 316i: F30, F31 | 2012-2019
BMW 318i: F30, F31 | 2012-2019
BMW 320i: F30, F31 | 2012-2019
BMW 328i: F30, F31 | 2012-2016
BMW 330i: F30, F31 | 2016-2019
BMW 335i: F30, F31 | 2012-2015
BMW 340i: F30, F31 | 2015-2019
BMW 420d: F32, F33, F36 | 2014-2020
BMW 425d: F32, F33, F36 | 2014-2020
BMW 430d: F32, F33, F36 | 2014-2020
BMW 435d: F32, F33, F36 | 2014-2020
BMW 420i: F32, F33, F36 | 2014-2020
BMW 428i: F32, F33, F36 | 2014-2016
BMW 430i: F32, F33, F36 | 2016-2020
BMW 435i: F32, F33, F36 | 2014-2016
BMW 440i: F32, F33, F36 | 2016-2020
BMW M135i: F20, F21 | 2012-2016
BMW M140i: F20, F21 | 2016-2019
BMW M235i: F22, F23 | 2014-2016
BMW M240i: F22, F23 | 2016-2021
BMW M340i: F30, F31 | 2019-2019

Notes

Installation Instructions
Replacement rods available through SPL, please contact us
SPL components are made-to-order in the USA; build time will be confirmed at the time of order

Frequently Asked Questions

What happens to the rear sway bar if the endlinks have preload on a lowered F2x or F3x? When a rear sway bar endlink has preload, the bar is already twisted at rest and applying force on the endlink bolt; removal is difficult because of the constant load on the hardware, and installation requires manually twisting the bar to align with the endlink at ride height. More importantly, the preloaded bar introduces a baseline roll stiffness bias that favors one side of the car, making the handling response asymmetric between left and right turns. Adjustable endlinks allow the length to be set to the exact value that produces zero preload at ride height, restoring a neutral, symmetric rear balance.
Does the SPL RE F3X fit all F2x and F3x model variants? Yes. One part number covers all F2x and F3x models from 2010-2019, including the F20, F21, F22, F23, F30, F31, F32, F33, F34, F35, and F36. This covers 1 Series, 2 Series, 3 Series, and 4 Series coupe, sedan, wagon, convertible, and Gran Coupe body styles within those ranges.
Why do the Chromoly High Misalignment Studs make a difference over standard ball studs at the sway bar? Standard ball studs typically provide 15 to 20 degrees of articulation. At the factory sway bar adjustment hole position, that is sufficient. When an aftermarket rear sway bar uses a stiffer adjustment hole that moves the connection angle away from factory geometry, a standard stud approaches or exceeds its articulation limit and begins to bind, restricting bar movement and accelerating joint wear. The 65-degree Chromoly High Misalignment Studs on the RE F3X articulate freely at every hole position without restriction, allowing the bar to perform at its full rated stiffness at any setting.
What warranty does SPL Parts provide on the RE F3X? SPL Parts backs this product with a 10-year/100,000-mile warranty against defects in material and workmanship from the date of purchase. If the product fails to meet specifications within that period, SPL Parts will repair, replace, or make appropriate adjustment at their discretion.
Can replacement rod ends be ordered if one wears out? Yes. SPL Parts offers replacement rod ends for the RE F3X. Contact SPL Parts directly through their website for the correct replacement part for your specific endlink.

About SPL Parts

SPL Parts is a USA-based manufacturer of high-performance suspension components engineered for both professional racing and demanding street applications. Built on the core principles of strength, lightweight construction, low friction, and precision, SPL Parts products deliver the adjustability and alignment performance required by top race teams and discerning enthusiasts alike. Every component is produced using USA-sourced, certified materials and machined by experienced local shops to exacting tolerances. Professional TIG welders ensure maximum weld integrity, while each part is hand-fitted and treated with anti-seize and 3M internal panel coating for lasting protection. SPL Parts conducts all research and development in-house, allowing the team to leverage firsthand product knowledge and deliver unmatched customer support. Their suspension components feature innovative adjuster designs for quicker, more precise alignments, and utilize spherical bearings with Teflon liners that are self-cleaning, self-lubricating, and built for long service life. From concept to assembly, SPL Parts is made with pride in the USA by skilled machinists and welders who are committed to quality, innovation, and performance.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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SPL Parts Adjustable Rear Sway Bar Endlinks for F2x / F3x BMW 1, 2, 3, and 4 Series [SPLREF3X]

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SPL Parts Adjustable Rear Sway Bar Endlinks for F2x / F3x BMW 1, 2, 3, and 4 Series

Features

Specifications

Applications

Notes

Frequently Asked Questions

About SPL Parts

Reviews