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The strut bump stop is the final cushion inside a coil-over strut assembly: a polyurethane component that compresses when the suspension reaches full travel and stops the damper rod from striking the top mount. This page presents the Strut Bump Stop with OE reference 96549925 and Bonpora No. 4110039, a polyurethane buffer made in China for Daewoo Lacetti, Chevrolet Lacetti, and Nubira applications. The sections below explain the function of the part, its dimensions, OEM cross-referencing, wholesale supply from the factory, custom manufacturing options, and fitting notes for workshops, importers, and parts distributors.
In everyday driving the coil spring carries the vehicle weight and the damper controls body movement. When a wheel drops into a deep pothole or rides over a sharp road edge, the remaining suspension travel is used up almost at once. At that point the bump stop is compressed between the piston rod area and the top mount of the strut. Because polyurethane compresses in a progressive curve, the part behaves like a secondary spring: soft on first contact, then progressively firmer as compression deepens. This controlled response absorbs the final stage of the impact and protects the damper rod, the top mount bearing, and the surrounding sheet metal from a hard bottom-out.
When the buffer is missing, cracked, or permanently flattened, the strut reaches the end of its travel with no cushion. Drivers notice a heavy knock over bumps, a harsh and unsettled ride, and extra noise from the top of the strut. Lacetti and Nubira suspensions are compact designs with limited travel around the struts, so the bump stop carries a high share of the impact load and wears steadily with mileage and road quality. For workshops the bump stop is one of the lowest-cost items to renew while the strut is already disassembled, and for distributors it is a fast-moving wear part with steady repeat demand across the GM Korea vehicle parc.
The OE reference 96549925 belongs to the GM Korea parts numbering system used across the Daewoo and Chevrolet ranges. The Lacetti was developed on the compact J-series platform, which was sold under several names by market and model year: Daewoo Lacetti and Daewoo Nubira in Korea, Chevrolet Lacetti and Chevrolet Nubira in Europe and many export markets, and further badge variants in regions where the platform was marketed by partner brands. Because the same hardware carried different names, the most reliable check is the OE number itself, supported by the chassis code and model year. The stop slides over the piston rod of the strut and sits beneath the dust boot, above the damper seal area. Confirm the exact application for the specific vehicle before ordering: check the parts catalogue by model and year, or compare the bore, outer diameter, and free length against the removed original part. Supplying the VIN to the supplier removes most ambiguity before a quotation is issued.
| Parameter | Value |
|---|---|
| Product Name | Strut Bump Stop |
| Country of Origin | China |
| Bonpora Nos | 4110039 |
| OE | 96549925 |
| Fitment | Daewoo Lacetti / Chevrolet Lacetti / Nubira |
| Size | Φ21 x Φ64 x 58 mm |
| Material | Polyurethane |
| Warranty | 1 Year |
| Delivery Time | 15-30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM & Custom Design Support |
The dimension note Φ21 x Φ64 x 58 mm describes a compact stepped body: a 21 mm inner bore that slides over the piston rod, a 64 mm maximum outer diameter, and a 58 mm free length at rest. All three figures must match. The bore has to seat cleanly on the rod shoulder, the outer diameter must pass inside the dust boot without rubbing, and the free length determines when the stop starts to work. A stop that is slightly too long will preload the suspension and alter ride height, while one that is too short allows the strut to bottom out early and transfers the knock straight into the body. The short free length of this reference is typical of compact strut housings with limited internal travel, so measuring the removed original part before ordering is strongly recommended.
Polyurethane is selected ahead of ordinary rubber for this product family because it resists oil, ozone, road salt, and repeated compression cycles far better. It holds its shape under sustained load, which matters on vehicles that frequently run fully loaded or on rough roads, and it performs consistently in hot climates where rubber buffers tend to harden and crumble early. The longer service life of polyurethane also reduces warranty claims for distributors who resell into demanding markets.
Sourcing by OEM number is the most reliable route when the original part is still legible. The number 96549925 identifies this bump stop in GM Korea and Chevrolet parts listings, and it maps to a single Bonpora No. 4110039, so distributors and repeat buyers can reorder one specification without re-checking drawings each time. For mixed orders that span several product groups, the auto parts catalogue organises references by system and by vehicle model, which shortens the quotation workflow considerably.
If the OE number has worn away, identify the part by vehicle data instead: brand, model, model year, engine, and front or rear axle. A photograph of the removed part next to a ruler, together with the VIN, allows the supplier to confirm the match before shipment. Workshops that service several Lacetti and Nubira variants in one bay can consolidate their bump stop stock under Bonpora numbers, keeping one part code per application and simplifying reordering.
This bump stop is produced in China for wholesale distribution. The part runs as a catalogue item, which means the tooling already exists, dimensions remain stable between production batches, and pricing is structured for carton, pallet, and container quantities rather than single-piece retail. Typical buyers include importers of suspension and rubber components, national and regional parts distributors serving the Daewoo and Chevrolet parc, fleet maintenance operators, and online sellers who need a dependable source for GM Korea fast movers. The suspension and rubber parts range from the same production site covers companion items that are usually ordered together, such as strut mounts and dust boots.
Orders ship in neutral export packaging by default, so goods arrive ready for relabelling under the own brand of the distributor. Delivery time is 15 to 30 days depending on order volume and production scheduling, and the warranty period is 1 year. For first-time customers, sample quantities can be arranged before a bulk commitment so that fitment can be verified on real vehicles before the container is booked.
Each production batch is checked for bore diameter, outer diameter, free length, and material hardness. Visual inspection covers flash, voids, and surface defects that could lead to early cracking in service. Dimensional records are kept per batch, so repeat orders match the approved sample rather than drifting over time. This batch-level traceability is one of the reasons the part can be offered with a 1-year warranty for export markets.
Beyond the catalogue part, the same production line supports OEM and custom design work. Available options include tailored polyurethane hardness, adjusted free length, bore, or outer diameter, coloured material for brand recognition, branded packaging, and private-label marking. Distributors serving a defined vehicle parc often combine several suspension items in one shipment to reduce the freight cost per unit. For a custom project, send a drawing or a physical sample together with the expected annual volume. Tooling and sampling lead times are quoted separately from mass production, and a first-article sample is normally supplied for fitment confirmation before the production run starts.
Replace bump stops in pairs on the same axle, and inspect the dust boot, top mount bearing, and spring seat at the same time. A collapsed or crumbling stop usually indicates that the strut has been bottoming out, so check the damper for oil loss before refitting the assembly. Torque the top mount nut to the figure given by the vehicle maker, with the suspension at normal ride height where the service data requires it.
A polyurethane stop should seat fully on the piston rod shoulder. If it does not sit flat it will wear unevenly and may generate noise within a short mileage. Because the buffer works inside the dust boot, a light coating of the grease specified by the vehicle maker makes future removal easier and reduces the chance of squeaking through the boot.
Typical signs are a hard knock over speed bumps, a harsh or unsettled ride, and visible cracking, crumbling, or permanent compression of the old stop. Because the stop sits under the dust boot, it should be inspected whenever a strut is disassembled. If the strut has been bottoming out, check the damper for oil seepage at the same time, since a failed buffer often shortens damper life.
The reference is listed in GM Korea catalogues for Lacetti and Nubira applications of the corresponding production years, including vehicles sold as Daewoo Lacetti, Chevrolet Lacetti, and Chevrolet Nubira. Exact fitment varies by model year, trim, and market, so confirm against the parts catalogue or send the VIN for a precise match before ordering.
Yes. OEM and custom design support is available, including adjusted polyurethane hardness, modified free length, bore, or outer diameter, coloured material, and private-label packaging. Send a drawing or a sample together with the target annual volume to receive a quotation and sampling schedule.
Delivery time is typically 15 to 30 days depending on quantity. Packaging is neutral export packaging by default, with branded options available on request, and the warranty period is 1 year. Sample quantities and mixed-container loading with other suspension parts can be arranged for new customers.
Send the OEM number 96549925, the Bonpora number 4110039, the quantity, and the destination port, and the sales team will confirm specification, packing, and delivery schedule. Buyers comparing several sources can review the full auto parts line, which covers suspension, steering, and engine components from the same factory under one catalogue.
