Chevrolet Strut Bump Stop 96586890: OEM and Custom Polyurethane Replacement Parts from China Factory

The Chevrolet strut bump stop 96586890 is a suspension buffer from the GM Korea parts numbering family, supplied here as a polyurethane replacement built to a measured profile of Φ16.3 x Φ48 x 60.5 mm. It sits on the damper rod inside the strut assembly and becomes the final stage of the spring rate when the suspension approaches full compression. Buyers who search this reference are usually rebuilding worn front struts, stocking the fast moving Aveo and Kalos service range, or comparing factories for a private label bump stop program.

Bonpora Parts manufactures this buffer in China with OEM and custom design support. This page explains how the 96586890 reference is used, which vehicles it is normally cross referenced against, how to verify fitment before ordering, and what a wholesale buyer should confirm when comparing suppliers.

What the 96586890 Strut Bump Stop Does

A strut bump stop looks like a small consumable, but it carries real load at the end of every hard compression. On a compact front strut the elastomer buffer is pushed onto the damper rod as the coil spring runs out of travel. From that point the buffer, not the spring, absorbs the remaining energy. It performs three jobs at once:

• It prevents metal-to-metal contact between the strut top mount and the axle or body when the suspension bottoms out over a pothole or a speed bump.
• It works as a progressive helper spring, so the front of the car does not sit down onto the bump stops of the tyre under load, braking or cornering.
• It protects the damper rod and seal from overload damage, which extends the service life of the shock absorber itself.

Because the buffer is compressed on every significant impact, it is a normal wear item. Polyurethane foam grades gradually take a compression set, crack at the leading edge or crumble with age and heat. Once the material loses height and resilience, the strut starts to bottom out earlier than intended and the driver notices harsh knocks over sharp bumps.

OE Number 96586890 - Format and Cross Reference

The 96586890 reference is written in the eight digit GM Korea format used across the Daewoo derived Chevrolet range. Catalogues and invoices may show it in several forms, all pointing to the same component:

The 965868xx series belongs to the suspension group of the Chevrolet Aveo and Daewoo Kalos programme, where adjacent references such as 96586885 to 96586888 appear in the same front shock absorber diagram. When comparing offers, always match the full reference and the physical dimensions rather than the vehicle model name alone, because the same platform used several buffer lengths across its production life.

Technical Specifications

The buffer is produced in microcellular polyurethane to the dimensions listed in the product parameter sheet:

The 16.3 mm bore slides over a small diameter damper rod, and the 48 mm outside diameter gives the progressive contact face used on light compact front struts. Buyers replacing an unknown used part can check all three dimensions with a caliper in a minute.

Applications and Fitment Guidance

The reference is supplied against Chevrolet front axle applications in the GM Korea small car range. The following table summarises how the number family is normally cross referenced in trade catalogues:

How to verify the part before ordering

Fitment for this family is usually straightforward, but the platform ran for close to a decade and catalogues do not always agree on year cutoffs. Before releasing a purchase order we recommend confirming three points: the full OE number on the used part or in the parts book, the three measured dimensions listed above, and the damper rod diameter at the strut in question. Where a customer supplies a VIN, we check the application before quoting. If any dimension differs from the table, ask us for a custom version instead of forcing a near fit.

For related damper components in the same range, browse our shock absorber parts catalogue, and for other buffer sizes and materials see the full polyurethane bump stops line.

Symptoms of a Worn Strut Bump Stop

There is no warning light for this part, so diagnosis comes from inspection and from how the car feels. The following signs point to a buffer that is past its useful life:

• A hard knocking or thudding noise from the front axle over potholes, speed bumps or sharp compression events.
• A bottoming out sensation under load, with passengers or cargo, even though the dampers still feel controlled in normal driving.
• Visible cracking, crumbling or permanent flattening of the buffer when the strut is dismantled for service.
• Grease or dust traces on the exposed damper rod where a failed dust cover and buffer no longer protect the seal.
• Premature damper seal wear or oil leakage traced back to repeated full stroke impacts.

Workshops normally replace the bump stop together with the strut mount and dust cover while the strut is already dismantled, because a second teardown costs far more in labour than the part itself.

Why Polyurethane Instead of Rubber

Original buffers on this platform were rubber or rubber foam. Modern replacement programmes increasingly specify microcellular polyurethane for three practical reasons. The material resists compression set better, so the buffer keeps its free height through more compression cycles. It tolerates temperature cycling and ozone exposure with less surface cracking, which matters in hot export markets. And the foam structure can be tuned, so the same outer profile can be delivered in a softer or harder grade to match a specific ride target.

OEM and Custom Manufacturing Support

Beyond the standard 96586890 replacement, we build bump stops to customer specification for distributors, suspension assemblers and private label brands.

Material grades

Production covers microcellular polyurethane and cast polyurethane. Microcellular grades keep weight low and give a smooth initial response, which suits stock ride heights. Cast grades carry more load at a given deflection and resist set better, which suits heavy use and rough road markets.

Hardness and profile tuning

Shore hardness is set per project, and the internal geometry of the buffer shapes the progressiveness of the spring curve. A softer grade engages gently and suits comfort oriented vehicles; a harder grade supports earlier and holds the axle higher under load. Samples are produced for validation before tooling is committed.

Dimensions and tooling

We work from a sample, a drawing or a measured original part. Bore diameter, outside diameter, free height and any internal reinforcement plate are treated as controlled dimensions. Tooling lead time and cost are quoted separately so that volume buyers can compare the full program cost.

Quality Control Before Shipment

Each production batch passes a documented process: incoming material verification, controlled mixing and curing, dimensional inspection of bore, outside diameter and free height, and compression checks against the agreed load target. Parts are compared to the reference sample before packing. We describe what the part measures rather than making performance promises, and buyers comparing factories are welcome to ask any supplier for the same data.

Packaging, Delivery and Trade Terms

Standard packing is neutral export packaging, with bagging and inner boxes arranged per customer requirement. Unbranded supply is available for distributors who sell under their own label. Lead time is 15 to 30 days depending on order size, and every order carries a one year warranty. Shipping can be arranged by sea, air or express courier, and mixed container loads with other suspension components are a common way for importers to balance freight cost.

Wholesale Buyer Checklist

Before comparing quotations for this reference, prepare the following so that offers can be matched like for like:

• Required quantity per order and expected annual volume, since tooling amortisation and price breaks depend on both.
• Confirmation of the three key dimensions, or a sample of the used part for measurement.
• Preferred material grade, or the target ride feel if the grade is to be recommended.
• Packing format, marking requirements and any barcode or label standard used in your market.
• Destination port or courier address so freight can be quoted accurately.

Frequently Asked Questions

Which vehicles does OE 96586890 fit?

The reference belongs to the GM Korea suspension series of the Chevrolet Aveo and Daewoo Kalos small car programme, covering the T200 generation and, in trade catalogues, the related T250 sedan as well. Because year cutoffs differ between markets, we ask buyers to confirm the full OE number and the measured dimensions before ordering, and we check any VIN supplied.

What are the exact dimensions of this bump stop?

The buffer measures Φ16.3 mm at the bore, Φ48 mm at the outside diameter and 60.5 mm in free height. These three figures are the fastest way to confirm that the part matches your used sample before a volume order is placed.

Can you produce a custom version with our own dimensions or brand?

Yes. We build bump stops from customer drawings, samples or measured originals, including custom hardness, internal reinforcement and marking. Neutral packaging and customer label programs are standard options, and sample parts are supplied for validation before mass production tooling is released.

What is the minimum order, lead time and warranty?

Standard production lead time is 15 to 30 days and the warranty period is one year. Minimum order quantities depend on whether the standard 96586890 tooling is used or a custom profile is required; contact us with your target quantity and we will confirm the applicable MOQ and price break.

Request a Quotation for 96586890

Send the required quantity, your destination market and any packing or marking requirements, and our sales team will reply with a formal quotation, current lead time and sample arrangements. For drawings and technical discussions, reach us through the contact information page, and ask for the Bonpora reference 4110197 to speed up matching.