Roof racks have a lot of small components that serve specific functions, and one of them is the rubber strip. At first glance, you might not think much of it, but it’s there for more than just decoration. You may wonder, “What does this rubber strip really do?” Well, its role is pretty important, and understanding it can help keep your roof rack in good shape.
Reducing Wind Noise
One of the most noticeable benefits of the rubber strip on a roof rack is noise reduction. When you drive at high speeds, the wind rushes over your car and any items on your roof. If the rubber strip wasn’t there, the gaps in the roof rack could make a loud whistling or humming sound. It stops the wind from getting into the spaces between the roof bars, reducing wind drag and the noise that comes with it.
A study on vehicle aerodynamics found that wind noise can become particularly disruptive at speeds over 60 mph, and roof rack rubber strips play a crucial part in preventing that.
At higher speeds, generally above 100 km/h (approx. 60 miles/h), aerodynamic wind noise tends to dominate the overall cabin noise. This is much more distinct today because the noise from the engine bay and powertrain has been significantly refined and reduced over the years.
https://www.grasacoustics.com/industries/automotive/wind-noise
Improving Aerodynamics
Aside from reducing noise, the rubber strip helps improve the overall aerodynamics of the vehicle. It minimizes air resistance by creating a smoother surface for the wind to flow over, leading to better fuel efficiency. Without it, wind could catch on the gaps in the roof rack and cause drag. More drag equals more fuel used. According to data on fuel consumption by the U.S. Department of Energy, even small things like roof racks and their components can affect fuel efficiency by as much as 10 – 15%. That may not seem like a lot, but over time, it adds up.
Adding roof-mounted light bars increased fuel consumption 7.1–12.7% when the vehicles were driven a constant 55 mph and 7.5% on overall driving miles (e.g., mixed speeds). Lenner (1998) investigated on-road impacts of roof racks for a 1992 Volvo 940 midsize sedan. The vehicle was equipped with an unloaded roof rack and driven at 43.5 mph, 49.7 mph and 55.9 mph. Fuel consumption increased 2.6%, 2% and 1.1% compared with a clean roof. When the roof rack was loaded with a ski box, fuel consumption increased 10%, 11% and 12.3% compared with the clean-roof conditions.
https://www.sciencedirect.com/science/article/abs/pii/S0301421516300714
Securing Accessories
Another important function of the rubber strip is to help secure accessories that you might mount onto the roof rack. The rubber strip can be removed, making room for attachments like bike racks, cargo boxes, and other tools you might use on the rack. It works almost like a barrier that, when removed, makes space for different attachments, ensuring they stay firmly in place.
Preventing Water Leaks
Rubber strips are also good for preventing water from seeping into your roof’s seams or rack components. Rainwater tends to gather and flow along the roof, especially when you’re driving, and without the strip, water could settle into unwanted areas. A good rubber strip ensures that water is deflected away from any exposed spaces, protecting your vehicle’s structure.
Ensuring a Tight Fit for Loads
When carrying large loads, the rubber strip helps create a snug fit between your cargo and the rack. Without it, heavy items might shift while you’re on the road, making the load less secure. These strips are crucial for keeping things stable, especially on long trips. If the rubber strip gets worn out or lost, it’s worth replacing it as soon as possible.
The Small Strip with a Big Purpose
So, what’s the purpose of the rubber strip on a roof rack? It’s more than just a piece of rubber. It reduces noise, improves aerodynamics, protects both your rack and cargo, and ensures the accessories you attach are secure. Ignoring such a small component could lead to bigger issues like increased fuel consumption or even rack damage. So, next time you see that rubber strip, you’ll know just how important it really is.
And if yours is starting to wear out, don’t wait too long to replace it—it can save you a lot of hassle down the road!
