25mm Thickness for Improved Cornering
2 Way Adjustable
Sway Bar Bushings and Mounts Included
Compatible with FK8/FL5 Type R & DE5 Type S

Description
Vehicle Fitment
Technical Data
Included

Eibach 25mm Rear Sway Bar - 2017-2021 Honda Civic Type R (FK8)

The FK8 Type R comes with a 20.5mm solid rear sway bar from the factory. It's fine for the street but push the car hard through a sweeper or spend a day at autocross and you'll feel the chassis lean in before the tires run out of grip. That's the bar telling you it needs an upgrade. Eibach's 25mm rear sway bar is tubular, 2-way adjustable, and it's a significant step up in stiffness over stock. You're getting way less body roll and you're getting adjustability so you can tune how the car behaves. Inner mounting position gives you a balanced setup for street and light track use. Outer position maxes out the stiffness for autocross or time attack where you want the least body roll possible. This is the aggressive option. If you're daily driving the car on stock tires, Eibach makes a 22mm version that's better suited for that. The 25mm's for when you're on sticky tires, lowered on coilovers or springs, and you're tracking the car or running autocross where maximum roll stiffness matters.

Here's Why Tubular's Not a Downgrade

The stock FK8 rear bar's 20.5mm solid steel. Eibach's bar's 25mm tubular. That might sound like you're losing stiffness because it's hollow but you're not. Sway bar stiffness scales with the fourth power of the diameter. The jump from 20.5mm to 25mm is a massive increase in stiffness even with the hollow center. Eibach sizes the wall thickness specifically for the FK8 platform to hit the right rate. You're getting way more roll resistance than stock. The tubular construction also saves weight compared to a 25mm solid bar. It's stiffer and lighter. That's the point.

2-Way Adjustable - Tune It to Your Setup

The bar's got two mounting positions on each end link. That's 2-way adjustability. The inner position's for street driving and light track use. You're getting noticeably less body roll than stock but the car's still balanced and predictable on street tires. The outer position's for when you're going full send at autocross or time attack. You're maxing out the bar's stiffness. Body roll's nearly gone. The car rotates harder. This matters because chassis balance is personal. It depends on your tires, your spring rates, your dampers, and how you drive. The adjustability lets you dial it in instead of being stuck with one setting that might not fit your setup.

Billet Brackets Because Stamped Steel Flexes

Here's a detail that separates this bar from cheap options. Eibach includes billet aluminum mounting brackets. The stock FK8 brackets are stamped steel. When you put a bigger, stiffer bar under consistent load on track, stamped brackets flex and deform over time. We've seen it happen. The brackets bend slightly and now your bar's not doing what it's supposed to do. Billet brackets don't flex. They're way stronger than stamped steel and they're not going to deform under load. Eibach includes them in the kit so you're not reusing weak stock hardware on a stiffer bar.

Replace Your End Links While You're in There

The stock FK8 end links are adequate with the stock sway bar. They're not adequate with a 25mm bar, especially if you're tracking the car. The stock end links are the weak point. They'll flex under the increased load and you're losing some of the bar's effectiveness. Replace them while you've got the bar out. Honda Accord rear end links are a direct fit on the Type R and they're way cheaper than aftermarket. They're like $30-40 from a Honda dealer. That's cheap insurance. Do it at the same time you install the bar and you're done.

Pick the Right Bar for Your Setup

Eibach makes two rear bars for the FK8. The 22mm and the 25mm. The 25mm's the aggressive option. It's for when you're on sticky performance tires (200TW or stickier), you're lowered on springs or coilovers, and you're running track days or autocross where you want maximum roll stiffness. On that setup, it's excellent. On a stock daily driver with factory Michelin Pilot Sport 4S tires or all-seasons, it's more bar than the rest of the suspension's ready for. The rear's going to be too stiff relative to the front. The car's going to feel skatey on wet roads. If you're mostly street driving on stock tires, buy the 22mm version. It tightens up body roll without pushing the rear balance past what stock tires can handle. If you're already on coilovers, sticky tires, and you're doing track events, the 25mm's what you want.

What You Get
- Eibach 25mm rear sway bar for FK8 Civic Type R
- Tubular construction (hollow center, sized for FK8 platform)
- 2-way adjustable (inner position for street/light track, outer position for autocross/time attack)
- Aircraft-grade steel (cold-formed, tempered, shot-peened)
- Red polyester powder coat over phosphate undercoat (corrosion resistance)
- Billet aluminum mounting brackets included (stronger than stock stamped steel)
- Greased urethane bushings included
- All mounting hardware included (complete kit)
- Direct bolt-in to factory mounting points (no modifications required)
- 5-year warranty (factory defects in material and workmanship)
- Made by Eibach in the USA
Fits This Car
- 2017-2021 Honda Civic Type R (FK8 chassis, K20C1 engine)
Note: This is the 25mm bar (aggressive option) - Eibach also makes a 22mm version for street-driven FK8s on stock tires. 25mm is for sticky performance tires (200TW or stickier), lowered suspension (springs or coilovers), and track/autocross use where maximum roll stiffness is the goal. On stock daily driver with factory tires, 25mm bar is too stiff relative to front and will make car feel skatey on wet roads - buy 22mm version instead for street use. 2-way adjustable (two mounting positions per end link) - inner position for balanced street/light track setup, outer position for maximum stiffness at autocross/time attack. Stock FK8 bar is 20.5mm solid steel. Eibach bar is 25mm tubular (hollow) but significantly stiffer due to larger diameter (sway bar stiffness scales with fourth power of diameter). Tubular construction also saves weight vs. solid bar. Billet aluminum mounting brackets included (stock brackets are stamped steel and flex/deform under load from larger bar). Replace stock end links when installing bar - stock end links adequate with stock bar but weak point with 25mm bar, especially on track (Honda Accord rear end links direct fit, $30-40 from dealer). Complete kit includes bar, billet brackets, greased urethane bushings, all hardware. Direct bolt-in to factory mounting points, no modifications. Aircraft-grade steel, cold-formed, tempered, shot-peened. Red powder coat over phosphate undercoat for corrosion resistance. Works with Eibach Pro-Kit and Sportline springs, part of Eibach PRO-PLUS and SPORT-SYSTEM-PLUS packages. 5-year warranty. Made by Eibach in USA.
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2023-2026 Honda Civic Type R
Thickness: 25mm
(1) Rear Sway Bar
(2) Sway Bar Bushings

(2) Sway Bar Mounts

(2) Grease Fittings

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