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Porsche > Suspension & Axle > Anti Roll Bar >

Adjustable Rear 16mm Anti Roll Bar Assembly. Porsche 911 1965-86  ❭  91133370101

Adjustable Rear 16mm Anti Roll Bar Assembly. Porsche 911 1965-86 - 91133370101, 91133370107, 91133370110, 90133370104, 90133370103 - P87319
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Adjustable Rear 16mm Anti Roll Bar Assembly 

Transform the handling characteristics of your classic Porsche 911 with the Adjustable Rear 16mm Anti Roll Bar Assembly. Designed specifically for Porsche 911 models from 1965 to 1986, this performance suspension upgrade improves chassis balance, reduces body roll and provides the ability to fine-tune rear suspension behaviour to suit both road and track driving.

Fits:

  • Porsche 911 1965-1968 2.0L / 912 SWB (F)
  • Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
  • Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
  • Porsche 911 1978-1983 3.0L / SC
  • Porsche 911 1984-1986 3.2L

Whether you own an early short-wheelbase 911, impact bumper model or a late G-Series Carrera, upgrading the rear anti roll bar is one of the most effective ways to sharpen handling response and maximise the capabilities of the iconic rear-engined Porsche chassis.

The adjustable design allows owners and suspension specialists to tailor handling characteristics to individual driving preferences, tyre specifications and suspension setups, making it an ideal upgrade for fast road, touring, track day and competition applications.

What Does a Rear Anti Roll Bar Do?

The anti roll bar, also known as a sway bar or stabiliser bar, connects the left and right sides of the suspension system and helps control body movement during cornering.

Its primary functions include:
Reducing body roll Improving cornering stability
Maintaining tyre contact with the road Improving chassis balance
Enhancing steering response
Increasing driver confidence
Supporting more predictable handling

By reducing excessive chassis roll, the suspension can work more effectively and deliver greater grip through corners.

Why Upgrade to an Adjustable Rear Anti Roll Bar?

Many classic Porsche 911 models were designed with suspension settings that prioritised comfort and road use. Modern tyres, suspension upgrades and performance driving demands often exceed the capabilities of the original anti roll bar system.

Upgrading to the P87319 Adjustable Rear Anti Roll Bar offers significant improvements including:

  • Reduced Body Roll - The 16mm anti roll bar provides increased roll stiffness, helping keep the chassis flatter during aggressive cornering.
  • Improved Chassis Balance - A properly tuned rear anti roll bar can improve the relationship between front and rear suspension behaviour, resulting in a more predictable and balanced driving experience. 
  • Sharper Turn-In Response - Reducing chassis movement allows the car to react more quickly to steering inputs, delivering a more connected and responsive feel. 
  • Increased Cornering Confidence - The vehicle remains more composed through fast bends, allowing drivers to utilise available grip more effectively.
  • Adjustable Performance - Unlike fixed anti roll bars, this assembly allows tuning of suspension characteristics to suit:
  • Fast road driving
  • Touring Track days
  • Motorsport applications
  • Different tyre compounds
  • Custom suspension setups

Why Do Original Anti Roll Bars Become Less Effective?

While the anti roll bar itself is generally durable, the overall system can become less effective over time due to:

  • Ageing suspension bushes
  • Worn drop links
  • Chassis fatigue
  • Increased vehicle performance demands
  • Modern tyre grip levels
  • Suspension modifications

Many owners upgrading dampers, torsion bars or wheels find that an upgraded anti roll bar helps maximise the benefits of these modifications.

When Should You Upgrade?

This adjustable anti roll bar is an excellent upgrade when:

  • Restoring a classic Porsche 911
  • Rebuilding the suspension system
  • Installing performance dampers
  • Upgrading torsion bars
  • Preparing a car for track days
  • Improving fast road handling
  • Reducing excessive body roll
  • Fine-tuning chassis balance

It is particularly beneficial for enthusiastic drivers seeking greater precision and control from their classic 911.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91133370101
91133370101
91133370107
91133370110
90133370104
90133370103

The product you are viewing cross references to these numbers
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powerflex

Anti-Roll Bars (ARB’s) play an important role in a vehicle’s suspension system, helping to reduce body roll by transferring cornering load from one side of a vehicle to the other.

Often mounted to the vehicle’s chassis with rubber bushes, these bushes ensure the bar works as intended. To prevent the anti-roll bar from moving laterally within its mounts when turning, OE manufacturers will either bond the bushes to the bar, add dead-stops to the bar itself, or rely solely on the clamping pressure of the rubber.

But what happens when those bushes wear and need to be replaced? Often anti-roll bars with bonded bushes come as a costly complete assembly, so the alternative is to fit a more cost-effective unbonded polyurethane replacement, like the many we offer.

In most cases, friction from the bush will prevent any side-to-side bar movement. Still, when turning aggressively or cornering at higher speeds, a laterally shifting anti-roll bar decreases the efficiency and effectiveness of the bar, changing the dynamics of your suspension system in unpredictable ways. It also poses the risk of the bar fouling on other areas of the vehicle or suspension system.