Anti-Sway Cages – There are a few different ways that racks can be designed to minimize sway, but an anti-sway cage is the most widely used. In particular, you’ll find these on rack designs that hold the top tube, but rear mounted designs that lock the wheels can also benefit from built-in anti-sway tech. In essence, it’s just going to help to keep the bike stable in the rack as you drive. This has the dual benefit of not allowing the bikes to affect vehicle handling (especially at highway speeds) and also stops the bikes knocking into each other.
The rear strap design now requires the strap to go at an angle rather than directly over the wheel (as with previous Thule rack models). Make sure that you twist the strap clasp lock as well so it points to about 2 o’clock. I’m not entirely sure why this aspect of the design was changedm the straight-through strap always seemed fine to me and was more easily stowed away.
To be honest I wasn’t expecting to have a system that was super quiet. But this system is. I have never used such a quiet set of bars. I have been using them for the last few months and they have been on the car without boats, with one, two and three boats and each time the noise has been so quiet that it is not really noticeable. There was no need to turn the music up to drown out whistling! Thule reckon there is a 90% reduction in noise compared to the Aero bars. I couldn’t say whether or not it’s 90% but it certainly is virtually silent.
I must confess that I've used the 815s without bow or stern tie-downs, but my two kayaks have not budged at all. I peek at them through the moonroof on my car from time to time, and they've never shifted. It's important that you read the directions on how to secure the two strap assemblies. If you do it correctly, they will not loosen. Thule's buckle bumpers are pure genius for protecting your car and your boat. When I get home one night with only one kayak on the roof, I entered my garage before the door had fully opened. The bow of the kayak hit the bottom lightweight insulated aluminum panel of my garage door and crumpled it, but the kayak didn't budge (nor did it get damaged, phew!). However, in the interest of safety, I have resolved to use bow and stern tie-downs in the future. To this end, I have purchased and installed bow hood loops from Riverside Cartop Carriers on my car.
Choose aerodynamic roof bars for superior performance and a sleek, sophisticated look that complements the lines of your car. These roof rack cross bars also have many smart design features. A textured surface disturbs the airflow and greatly reduces wind noise. The aluminium extrusion creates one of the strongest load bars in the market. The design gives you quick, no-hassle installation. While the end cap pivots and T-track make it easy to add further loading options.