Strongflex Polyurethane Suspension Bushings

Strongflex Polyurethane Suspension Bushings – tighter mounting points, more consistent handling feel

Strongflex Polyurethane Suspension Bushings cover suspension bushes and related mounting bushings intended to replace ageing OEM rubber parts where excess movement creates vague steering or unstable geometry under load. Polyurethane (PUR/PU) typically holds its shape better than rubber in many suspension applications, which can help maintain alignment behaviour during braking, cornering and quick direction changes.

This category is useful if you’re chasing a fresher, more controlled feel for fast-road builds, track day use or drift projects, or if you simply want to remove play caused by worn rubber bushes. Typical positions include control arm bushes, anti-roll bar bushes, subframe mounts and rear axle/trailing arm mounting points, depending on the vehicle and kit.

Key trade-off: stiffer PU bushes can transmit more NVH (noise, vibration, harshness) and may squeak if installed dry or contaminated. Always select by the exact position and read the product notes, because the correct hardness and design can be location-specific.

Technical Basics

Strongflex bushes are commonly supplied in polyurethane (PUR/PU), an alternative to the OEM metal-rubber bushing construction. Hardness is given on the Shore A scale; you’ll often see 80 ShA (red) and 90 ShA (yellow), where higher Shore numbers generally mean less compliance and a more direct response.

Not every location suits a softer option: some OEM bushes are already very firm, so a 90 ShA replacement may be closer to the intended stiffness for that mounting point. If a product is only offered in one hardness, treat it as a position-specific choice rather than a universal upgrade path.

Kits may include a metal sleeve (crush tube) and washers, and in some designs the original outer shell (pressed into the arm) is retained while the bush insert is replaced. Whether a bush is split (two-piece) or requires pressing depends on the exact application, so confirm the construction on the product page before planning tools and labour.

For long-term quiet operation, correct lubrication is critical where the design requires it. If the inner sleeve or mating faces run dry, friction can cause squeaks and accelerated wear, even when the material itself is durable.

Selection Criteria

Start with vehicle and exact axle/position: an anti-roll bar bush, a front wishbone rear bush and a subframe mount all see different loads. Even within the same model, engine variants, factory suspension packages and year changes can affect fitment, so the product code and fitment notes should be your final reference.

As a general rule, 80 ShA (red) is often chosen for sporty street driving, while 90 ShA (yellow) suits drivers prioritising maximum response or frequent circuit use. If comfort on rough roads matters most, consider upgrading the most failure-prone points first (for example anti-roll bar bushes) rather than replacing every mount at once.

Check whether a bush is offset/eccentric or otherwise differs from the OEM design, as this may influence alignment settings. Some parts have a required orientation during assembly; if installed incorrectly, wheel alignment may be inconsistent and tyre wear can increase.

If the original part was hydraulic (fluid-filled), a PU replacement will usually feel noticeably firmer. In those cases, it helps to match hardness to your real use-case and accept that sharper response can come with more NVH.

Installation & Maintenance

Installation quality matters as much as the part choice: ensure clean seating surfaces and apply the recommended grease where required. With polyurethane bushes, a thin, even layer on the specified contact points and the crush tube helps prevent squeaks and binding.

If the old bush’s outer shell is retained, remove all rubber residue and corrosion from the bore and check for burrs. Pressing a bush in at an angle can damage the housing, so proper pressing tools (or professional fitting) can save time and parts.

Final tightening should follow OEM procedure; in many cases bolts should be torqued at ride height to avoid incorrect preload in the bush. After replacing control arm bushes or other geometry-sensitive points, a wheel alignment check is strongly recommended.

For maintenance, periodically inspect for loosened hardware, unusual noise and sleeve condition. If a squeak appears, re-check lubrication and torque values first, because symptoms are often caused by installation or operating conditions rather than material failure.

FAQ

Question: Should I choose 80 ShA (red) or 90 ShA (yellow) Strongflex bushes?
Answer: 80 ShA is commonly used for fast-road comfort with sharper response, while 90 ShA targets maximum control for harder driving and track use. Some positions are only offered in 90 ShA because the OEM bush is already very firm. Always decide by the specific mounting point and the product fitment notes.

Question: Why can polyurethane bushes squeak?
Answer: Squeaks are usually caused by insufficient lubrication, dirt ingress, or incorrect assembly of the inner sleeve and mating faces. If the design requires grease, apply it to the specified surfaces and keep the area clean. Also confirm torque settings and that the bush is not binding.

Question: Do I need wheel alignment after replacing suspension bushes?
Answer: If you removed control arms or disturbed geometry-sensitive mounts, a wheel alignment check is recommended. Changing bush compliance can alter how the suspension sits under load, so previous settings may no longer behave the same. Torque bolts at ride height before alignment for consistent results.

Question: Are Strongflex bushes press-in or two-piece?
Answer: It depends on the application: some are split PU designs, others are press-fit and may retain the OEM outer shell. Check the product listing for construction details and included hardware. Plan tools and labour based on that specific design.

Question: How long do PU bushes last compared to OEM rubber?
Answer: Polyurethane is generally more abrasion-resistant, but service life depends on road conditions, load, and installation quality. Track or drift use increases stress, so regular inspection is sensible. If you notice noise, play or abnormal tyre wear, inspect the mounts and sleeves promptly.

Narrow your selection by vehicle and position, confirm hardness and fitment notes, then choose the correct Strongflex option.