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How much weight can a regular car roof bear?

2 Answers

TheoFitz

07/24/25 3:32am

Generally, the pressure a regular car roof can bear is 1.5 times the weight of the car. Below are specific details about the damage caused by overloading: 1. Reduced braking performance: Increases the non-safe zone distance. There are many factors affecting a car's braking distance, among which changes in the car's load directly affect the length of the braking distance. Overloaded cars have increased inertia, leading to longer braking distances. The extension of the non-safe zone distance can easily lead to traffic accidents. 2. Shortens the lifespan of leaf springs: Reduces the vehicle's passing capability. Due to overloading, leaf springs are subjected to excessive force, and continuous bouncing during driving shortens their lifespan. Additionally, excessive load causes the vehicle to sink overall, reducing the distance from the ground and diminishing the car's passing ability. 3. Accelerates tire wear and deformation: Overloading the car causes the tires to bear excessive weight and deform, while also increasing friction, which shortens the tire's lifespan.

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VonBrooke

08/10/25 11:07pm

I've been studying automotive safety, and a car's roof is primarily designed to protect passengers from being crushed in rollover accidents, so its load-bearing capacity usually refers to the limit during dynamic impact, not a static weight indicator. Most standard models can withstand about 1.5 times the vehicle's own weight—for example, a 1,500 kg sedan may have a roof crush resistance of over 200 kg. However, this doesn't mean you can place heavy objects on it. When using the roof for luggage daily, it's recommended to use a dedicated roof rack and check the user manual or label for the load limit, typically within a 100-200 kg range. Overloading can easily deform or dent the roof, compromising overall structural safety and even causing water leaks. I've handled many cases where owners ignored these limits, leading to costly repairs—a reminder to prioritize safety and avoid exceeding recommended values for convenience.

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