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The BBM234111 strut bump stop is a suspension jounce buffer for Mazda models built on the compact front-strut platform family. It sits on the shock absorber piston rod inside the front strut assembly, and it works as a progressive end-stop: it takes over during the last part of suspension travel, absorbs impact energy before the damper reaches its internal limit, and protects the strut mount, the upper spring seat and the body shell from metal-to-metal contact. Importers, suspension rebuilders and wholesale distributors normally source this reference by OE number plus a measured dimension check, because several Mazda platform variants look almost identical on the shelf.
With a bore of 28 mm and a base diameter of 63 mm, this is a relatively large-front buffer rather than a slim road-car type. That geometry tells a buyer something useful before any catalogue lookup: it belongs to a heavier front strut, it is intended to be visibly loaded before it engages, and it should never be substituted with a smaller universal block just because the height looks close.
| Item | Specification |
|---|---|
| Product Name | Strut Bump Stop |
| OE Number | BBM234111 |
| Bonpora Nos | 4110166 |
| Fitment | Mazda |
| Size | Φ28 mm x Φ63 mm x 62 mm (inner bore x base outer diameter x free height) |
| Material | Polyurethane (PU) |
| Country of Origin | China |
| Warranty | 1 Year |
| Delivery Time | 15-30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM & Custom Design Support |
A Mazda badge on a tailgate is a marketing label, not an engineering identity. The same compact platform can be sold under different names in different markets, and one nameplate often covers several suspension generations with different springs, different dampers and different buffer heights. The number BBM234111 removes most of that uncertainty, because it identifies one physical buffer with a defined bore, base diameter, free height and bond between the elastomer and its seat. Wholesale buyers treat the number as the first filter, the measured dimensions as the second, and the vehicle name only as a cross-check.
Mazda uses block-style part numbers rather than the long numeric strings seen on some European brands. In this reference, the leading letters identify the model and platform grouping, the middle numeric block identifies the function and location within that assembly, and the trailing digits act as the individual part or revision index. A later revision can silently change height, hardness or compound without changing the family code, which is why a quotation request should always carry the complete number rather than the leading group alone. If a supplier answers with only a family code, treat it as an incomplete match.
For a 28 x 63 x 62 mm buffer, the height is moderate but the cross-section is wide. Buyers replacing this part on a lifted or heavily loaded vehicle should discuss the application with the supplier before assuming that a firmer grade is automatically better; the correct grade depends on the damper, the spring rate and the intended load.
Many factory jounce bumpers use cellular foam or a soft microcellular rubber. Those give a comfortable first contact but age quickly: they crumble, take on water, or take a permanent set after repeated full compression, which is exactly the condition found on higher-mileage Mazda cars used on poor roads. Polyurethane is a cast elastomer. It recovers its shape under cyclic loading, resists oils, road salt and ozone, and can be formulated across a wide hardness range, so a supplier can tune the compression curve to a target vehicle instead of shipping one generic block.
| Property | Polyurethane (this part) | OEM foam / soft rubber |
|---|---|---|
| Compression set after repeated cycling | Low, recovers shape | Higher, can crush permanently |
| Oil, salt and ozone resistance | Good | Moderate |
| Hardness tuning | Wide range available | Limited |
| Behaviour on full compression | Progressive, predictable rise | Can bottom out abruptly once crushed |
| Service life in mixed climates | Longer | Shorter, tends to crumble |
If you also source buffers for other platforms, the full range of polyurethane bump stops covers several vehicle families in consistent material grades, which lets you consolidate a mixed order into one shipment and one inspection report.
Bump stops rarely fail in isolation. Once the buffer collapses, the strut travels further than designed and neighbouring parts start carrying load. Common warning signs include:
Because these symptoms overlap with worn dampers, a replacement decision should be confirmed by inspecting the strut as a system. Related hardware is listed under shock absorber parts if you prefer to quote the complete strut service kit rather than the buffer alone.
The part is produced in China and shipped under neutral export packaging, so the carton carries no aftermarket brand and can be relabelled for your own programme. Standard production lead time is 15-30 days depending on order volume and whether tooling already exists for this reference. A 1-year warranty applies to the supplied buffer under normal installation and service conditions.
Buyers who need a private label buffer, a different hardness grade, a modified flange, or a part that has dropped out of the catalogues can use the custom parts service. Production starts from a drawing or a physical sample: the sample is measured, the compression curve is confirmed, a tooling sample is produced for fitment approval, and only then does batch production begin. This route is common for older Mazda generations where the original foam buffer is discontinued but the regional fleet is still large enough to justify a production run.
Each batch is inspected on three points. First, dimensional inspection of bore, base diameter and free height against the approved sample. Second, visual inspection for flash, voids, cracks and uneven bonding. Third, a compression and rebound check on a sampled basis to confirm the hardness grade and verify that the buffer returns to its free height without permanent set. Batch records are retained so any shipment can be traced back to its production lot.
No. The number identifies one buffer design used across a defined group of strut layouts. Because the same platform can appear under different names and model years, the correct method is to confirm the OE number against your parts catalogue and then verify bore, base diameter and free height against the part being replaced. A vehicle name alone is not sufficient confirmation.
Yes, and this is a common upgrade. The bore and mounting geometry must match, but the material may differ, and polyurethane typically outlasts the foam it replaces. Choose the hardness grade that suits the vehicle weight and how it is used; for frequent full compression or heavy loads, a firmer grade is usually specified.
Minimum order quantity depends on whether the reference is already in production or needs new tooling. For an existing reference such as 4110166 the entry quantity is lower; for a new custom buffer, tooling and a sample approval stage apply first. Share your target annual volume and the practical MOQ for your case can be confirmed.
Standard packing is a neutral export carton, suitable for container consolidation and for relabelling under your own brand. Inner packing can be adjusted on request, and mixed references can be combined in one shipment when the order is planned in advance.
Send the full OE number, your measured dimensions and the target model year, and the team will confirm availability, hardness grade, packaging and lead time. Samples can be arranged before a production order so your workshop can verify fitment on a real vehicle.
