15+ Maximum Speed With Roof Box Gif. When i drive this particular car it is indeed 3 mph. The box takes a lot of wind and makes you have to steer more in high speeds.
Some roof rack accessories such as roof boxes come with a maximum speed warning which shouldn't be exceeded. The only thing about this box is that you need to use the crossbars at their maximum separation, and even then it will lightly touch the antenna. Maximum weight for the momentum xc90 is 170 lbs.
Does the owner's manual mention anything about reduced speed with roof open?
The noise is also pretty annoying, too. Choice reviews car roof boxes from carfit, prorack, rhino, thule and yakima, to help you find the best one for your car. Rafter spacing, center to center, oc (inches). This was the average speed of the run.