James Stanbury

See other accessory reviews written by James Stanbury

The Atera Signo RT roof bars are easy to fit and come with a T-track for security – but they're only good for a light load, says our expert tester


When packing for caravan holidays it's easy to run out of storage space in the caravan itself. Not only that, but nobody wants to risk destabilising the caravan by loading it up with too many heavy items. So it's terrific that there's a wide range of roof bars available to fit almost every car.

But with so many rival products on the market, how can you choose the best roof bars for your tow car?  

From a distance, they all look pretty much the same, but don't be fooled. The wind noise, drag, effect on your fuel consumption, load-bearing capacity and fixing methods vary quite a bit.

We've found that some roof bars are easy to fit on your own, while others are so fiddly that you'll need a friend to help you. The vehicle-specific roof bars are generally the easiest to fit, but of course it will be annoying if you change your car and then have to buy new roof bars. The solution is to buy one of the modular roof bar systems, which are designed to fit any car. The catch? Modular systems are harder to fix securely.

At Practical Caravan we're always looking for car and caravan accessories that offer you the best value for money. So that's why we've been assessing the merits of ten different sets of roof bars, to make sure you buy the best. We have focused mainly on rail-fit bars, and wherever possible we have also tested the same bar fitted with mounts designed to be secured to door apertures.

The latter are more difficult to install on your own, because you really need to tighten each side up little by little, evenly. The way they work is that when you tighten the foot and clamp into one door aperture, it pulls against the foot and clamp on the other side of the car.

Sadly roof bars can be a target for thieves, so we appreciate the sets with added security measures. The safest to buy come with have and T-tracks. These T-tracks are narrow grooves cut into the top of premium bars and you'll get special bolts to fit into the tracks to secure your load. T-track bolts are easier to fit than U-bolts, because they don’t have to be kept pressed against the bottom of the bar while being pressed from above.

In our test, all rail-mounted roof bars were ordered for the Volvo V70/850 Estate.

Here we are testing the Atera Signo RT, costing £134.95 from Roofbox. Atera’s premium range of bars is the polar opposite to the standard Signo. The Signo RT roof bars have advanced aerofoil profiles, which are said to improve your car's mpg and cut down wind noise — especially when the bars are unloaded.

The shape makes the bars a little wide, at 85mm, but a T-track comes as standard to solve any fixing difficulties caused by using overly wide clamps.

These are much easier to fit than the basic Atera Signo, too. Simply remove the locked plates, on each foot, to reveal a single adjuster bolt, which moves the jaws and secures the foot along the bar.

But we do feel that, given the bars’ premium price, the maximum loading of 50kg — actually the lowest of all the roof bars tested — is a compromise.

Technical specs

Choice of materials in Atera rangePlastic-coated galvanised steel or aluminium
Sizes32 x 22mm (steel) or 57 x 30mm (aluminium)
No extra tools neededAllen key supplied


The Atera Signo RT is higher up the evolutionary ladder than its more basic Signo sibling. We appreciate its improved design in every way, but that 50kg maximum load is a potential deal-breaker for us. We've awarded it a two-star rating.

Browse through our other roof bar reviews to see prices and star ratings at a glance and find the best product for your caravan holidays.



  • Quieter than its sibling
  • Easier to fit than the standard Signo
  • Has a T-track for security


  • 50kg maximum load is too low
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