Speed Limit With Roof Box

Adapt your speed to the conditions of the road and the load being carried.

Speed limit with roof box.

For safety to your vehicle and rack system obey all posted speed limits and traffic cautions. Max speed when driving with a roof box. Reply prev 1 2. With reference to the amount of petrol used the consumption will go up whatever speed you go at with a roofbox on so going slower is not going to improve consumption it s all relative the ideal speed for consumption is around 55 60 but that does not mean you have to increase your speed to this to get ideal consumption if in a 30 or 40 limit as it does not mean you should reduce from 70 to this to significantly increase performance.

Aerodynamic drag increases with speed and exceeding the speed rating could effectively exert too much force onto the accessory or the roof rack. You re driving well within the speed limit and keeping a two second gap between your vehicle and the car in front. The only statement that thule has on the speed you should travel while carrying a cargo box on the roof like th615 is the following. Be sure to read their instructions carefully too.

Some roof rack accessories such as roof boxes come with a maximum speed warning which shouldn t be exceeded. Bars that have an aerofoil shape are the quietest. Some roof boxes are rated for a maximum of 60 mph so check this out before you buy. With a well designed roof box and roof bars wind noise shouldn t be much of a problem.

Do not use thule load carriers and accessories for purposes other than those for which they were designed. Exceeding the speed rating could damage your car or the roof rack. As far as you can see the driver in front is also doing everything they should to stay safe on the roads. If towing a caravan you re already limited therefore no problem but solo it might be.

For safety to your vehicle and rack system obey all posted speed limits and traffic cautions. As long as your rack is properly attached to the roof and you re not exceeding the weight limits how can there be. The speed rating more than like has to do with drag and lift factors as mentioned above. Do not exceed their carrying capacity.

There shouldn t be any maximum speed. Wind noise and fuel economy. You ll introduce a hell of a lot of drag and significantly lower gas mileage but otherwise there should be no problems at any speed. A lot of roof rack accessories such as roof boxes come with maximum speed ratings.

My usual trip to south of france is 36 38 mpg with roof box 32 34.