A roof box is a useful way to expand the storage capacity of your vehicle. People commonly use them for road trips, camping, and vacations. But one thing you’ll need to know is how much weight a roof box can hold before you risk damaging your car or making it unsafe to drive. In this article, we’ll break down how to figure out the weight limits for roof boxes and the factors that come into play.
What Is the Average Weight Limit for Roof Boxes?
The typical roof box weight capacity ranges between 150 and 165 pounds. However, the specific weight that a roof box can hold depends on several factors: the make and model of the box, the roof rack system on your car, and, most importantly, your vehicle’s roof load capacity. The manufacturer of your vehicle always specifies the maximum roof load in the owner’s manual, and that number includes the weight of the roof box itself, the roof rack, and any gear you load into it.
For instance, many Thule roof boxes have weight limits around 220 lbs. Yakima roof boxes can range from 86 to 120 lbs. Always refer to your roof box manufacturer’s manual for the exact specifications, but don’t forget the roof load limit of your car too.
Check Your Vehicle’s Roof Load Capacity
Your vehicle’s roof load capacity plays a huge role in determining how much weight you can safely put in a roof box. Most cars have roof load limits that range from 150 to 165 pounds. Some SUVs and larger vehicles may have higher limits, but smaller cars, like sedans, can have lower capacities. This includes the weight of the roof box, roof racks, and any other accessories you might attach.
To find this information, check your vehicle’s manual or search on trusted automotive websites. For example, if your car’s roof load limit is 165 pounds, and your roof box weighs 35 pounds, you can only load an additional 130 pounds of gear.
Factors That Affect Roof Box Weight Limits
Not all vehicles and roof racks are made equal, and there are several factors to keep in mind:
- The Roof Rack System: The strength and compatibility of your roof rack is critical. Some racks are rated for heavier loads, while others can only support lighter cargo. If you overload the rack, it could damage both your roof and your rack system.
- The Roof Box Itself: Some roof boxes are sturdier than others. High-end boxes from brands like Thule or Yakima are designed for heavier loads. Cheaper alternatives might not be able to handle as much weight. The construction material and design of the box make a difference in how much weight it can safely hold.
- Road Conditions: Weight distribution matters, especially if you’re driving on uneven or rough roads. A fully loaded roof box can make a car top-heavy and less stable, particularly during cornering or braking.
- Legal and Safety Considerations: Different regions have regulations concerning roof loads. In some areas, it’s mandatory to stay under a certain weight for safety reasons. Always make sure you’re within legal limits to avoid fines or accidents.
Can You Exceed the Manufacturer’s Stated Weight Limits?
No, exceeding the recommended weight limits is not only unsafe but could also damage your car or void your warranty. When you overload a roof box, you increase the chance of roof rack failure, which could lead to your cargo flying off the vehicle, causing accidents. Additionally, too much weight can warp your vehicle’s roof, affect your fuel efficiency, and put unnecessary strain on your suspension.
Here’s a quote from a well-known auto magazine that emphasizes safety: “Overloading your vehicle roof puts everyone at risk, and even a minor misjudgment in weight distribution can cause instability at high speeds” .
Does the Type of Cargo Matter?
Yes, the type of items you load into your roof box does matter. Heavy, compact items like camping gear or skiing equipment may put more strain on the vehicle’s roof than lighter, bulky items like sleeping bags or tents. It’s also important to distribute weight evenly. If all the weight is concentrated in one spot, it may throw off the car’s balance and affect its performance on the road. Experts suggest packing heavier items toward the center of the roof box and lighter ones at the ends for optimal balance.
Conclusion
To sum it up, the weight limit of your roof box depends on a combination of factors: the box itself, your vehicle’s roof load capacity, and your roof rack. Always respect the weight limits set by the manufacturers and spread the load evenly to ensure safe driving. Ignoring these can lead to accidents, car damage, and legal issues. Follow safety protocols, and you’ll be able to enjoy the extra storage without a hitch.
