![]() ![]() ![]() So, if your crossbar solution and roof box each weigh 10 kg, you’ll have 60 kg left for your gear.Ĩ0 kg – 10 kg crossbar solution – 10 kg roof box = 60 kg However, the amount of gear you can place up there will be somewhat less as you need to factor in the weight of your crossbar solution and roof box. In the example above, we determined that the maximum load capacity was 80 kg. Once the maximum load rating is known you can then calculate the amount of gear your system can carry. Remember, your carrying system will only be as strong as the weakest link involved. The component with the lowest rating dictates the maximum load rating of the system. In this case, the vehicle roof has the lowest rating. For example, if your roof rack solution has a product load rating of 100 kg, your roof box has a load rating of 90 kg and your vehicle’s roof has been rated by the manufacturer as being able to hold up to 80 kg, then the maximum you can have up top is 80 kg. The actual amount you can carry on top of your vehicle will be dictated by the item that has the lowest load capacity. A carrying accessory such as a roof box, kayak holder, etc.Įach of the items listed above has its own maximum load rating which dictates the heaviest load which that particular item can safely carry or hold.A roof rack solution (typically consisting of crossbars, legs and a vehicle specific fitting kit), and possibly,.Load ratings for each component that makes up your carrying systemĪ typical Prorack carrying solution consists of:.When calculating how much weight you can carry on top of your vehicle there are few key factors to consider: If still in doubt, please drop us a line using our online contact form. For example, taller buildings are subjected to greater wind loads than shorter ones.The purpose of this guide is to help you determine how much gear you can safely carry on top of your vehicle. Shape of the structure - this refers to properties such as the structure's height, width, and geometry. For instance, a wind hitting at 90° generates greater loads than the same wind at 45°. ![]() Impact angle - the angle at which the wind hits the structure, measured from the horizontal. You can use the air density calculator to determine air's density at other conditions□ For conditions significantly different than these, it is better to use the local density value to get more accurate results. ![]() Wind speed - winds at higher speeds generate greater loads.ĭensity of the air - as a general practice, the air density is taken as 1.225 kg/m 3 / 0.0765 psi, which corresponds to a temperature of 15☌ / 59☏ and sea level altitude. The following are the key elements that influence lateral wind load: In this article, we're only focusing on this last type, the lateral wind load.
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