What is the rear door threshold protection device for the car?
The rear door threshold protection device, often referred to as the rear door threshold strip, rear door threshold protection plate, or trunk threshold protection bar, is a functional accessory specifically installed under the metal edge of the vehicle's rear door (i.e., the rear door threshold area).
Core functions
Prevent scratches: Resist repeated scratching of the original paint and sheet metal by shoes, high heels, sand, stones, etc. during getting in and out of the vehicle.
Prevent corrosion: Isolate the erosion of rainwater, mud, de-icing agents, etc. on the metal threshold, and delay rusting.
Enhance safety: Especially for SUVs, MPVs, etc., with higher body profiles, it can serve as a stable "transition step", facilitating the entry and exit of the elderly and children.
Enhance appearance and sense of ceremony: Some styles feature LED lighting effects, brand logos, or metallic brushed texture, enhancing the interior's sophistication.
Common materials and characteristics
Stainless steel: Durable, corrosion-resistant, easy to clean, commonly found in high-end custom parts .
Aluminum alloy: Lightweight, resistant to oxidation, suitable for owners seeking a high-quality feel .
TPE/TPU rubber: Flexible, anti-slip, quiet, does not damage clothing, suitable for family vehicles .
Carbon fiber/ABS plastic: Lower cost, decorative, but with relatively weaker protection . Installation method
Most are adhered using 3M high-strength adhesive, without the need for drilling holes, and the disassembly leaves no traces.
Some special car-specific styles will reinforce using the original vehicle screw holes.
For models with LED lights, it is recommended to install by professionals to ensure the safety of the circuitry, as it is crucial for vehicle longevity and aesthetic appeal.
Is it necessary to install it?
According to multiple public sources, vehicles without threshold protection have a probability of significant wear in the threshold area of over 67% within three years.
Especially in the following situations, it is strongly recommended to install it:
Models such as SUVs and MPVs with higher ground clearance;
Often carrying the elderly, children, or pets;
Daily driving conditions with frequent rain, snow, and mud;
Emphasizing vehicle preservation rate and long-term aesthetics.
If the original factory threshold has already used wear-resistant plastic or the daily usage frequency is extremely low, it can be considered not to install.
The rear door threshold protection device (also known as the rear door threshold strip or rear threshold protection panel) is a protective component installed on the metal edge below the vehicle's rear door. Its main functions include the following aspects:
Core function
Prevent shoe soles from scraping and damaging the car paint: When getting in or out of the vehicle, the shoe soles (especially hard-soled shoes, shoes with mud and sand) repeatedly rub the threshold area, which is very likely to cause paint scratches and peeling. The threshold strip acts as a buffer layer, directly bearing the wear, and protecting the original factory paint.
Block sand, rain, salt erosion: Effectively preventing sand, rain, snow-melting agents, etc. from penetrating through the threshold gap and delaying the rusting of the body panel, especially in rainy and snowy areas or coastal regions, the effect is significant.
Improve safety during getting in and out of the vehicle: For SUVs and MPVs with higher models, the rear door threshold is often used as a stepping support point. The anti-slip surface (such as frosted TPU, metal brushed texture) can reduce the risk of slipping, especially friendly for the elderly and children.
Protect the luggage loading and unloading area: The rear threshold frequently contacts luggage wheels, shopping bag handles, pet claws, etc. when opening the rear door, and the protective device can avoid scratches or dents.
Added value
Maintaining vehicle appearance and residual value: Avoiding grayish-white marks, rust spots or dents in the threshold area helps maintain the condition of a new vehicle and enhance the assessment value of a used car.
Enhancing aesthetics and personalization: Stainless steel, aluminum alloy, carbon fiber and other materials can match the interior style; some products come with LED greeting lights, enhancing the sense of ceremony.
Non-destructive installation, without damaging the original vehicle: Most special vehicle-specific products use snap-fit or high-strength adhesive (such as 3M) for installation, requiring no drilling and leaving no residual glue when removed.
Special reminder: If the vehicle is a model such as NIO ES8 with high-gloss black paint finish and aluminum tailgate, the original factory threshold is prone to leaving fine scratches. Installing the threshold strip is particularly important for maintaining the texture and residual value of the used car.
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