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EASY TO USE. Simple autostop feature allows you to preset the pressure you need, and it will automatically stop inflating once that pressure is reached. Accurate inflation, every time The built in LED light makes inflating at night easier and safer, and can be set to SOS mode to attract attention or warn other motorists. The pressure is usually shown in two formats: bar and psi. There are typically two sets of these. The lowest is for normal use, but you may well see another set of higher pressures for when the car is heavily loaded, increasing the weight that’s pushing down on the tyres. The RAC635 is a multi-award winner. It won Auto Express’ Best Buy Award in 2014, and Professional Driver magazine’s Best Buy for mini air compressors. The experts agree: this is the best mini digital air compressor there is.
As well as being capable of pumping up car tyres, this air compressor also comes with a handful of other adaptors to inflate bicycle tyres, inflatables and footballs. Should I buy one? Some inflators have 12V ports so they can effectively be used as an extension lead that connects other accessories to your car’s power. If your car isn’t fitted with a USB port, it’s useful to have a tyre inflator with this feature so that you can charge a tablet or smartphone on the road.Larger inflators include rechargeable batteries, which make them completely portable. These are a better option if you want to pump up, say, bicycle tyres, without having to wheel the bike next to your car. You may also need a larger inflator for tyres that need higher-than-average pressures, such as a larger van or campervan. What about extras? Size is probably the most important thing. The smallest inflators are around 20 x 20cm, so you can leave them in your car without losing too much luggage space. The best don’t skimp on the length of the power lead and air hose, which makes it easier to reach all four valves. Most can be preset to stop inflating when your tyre reaches the correct pressure. Tyre pressures are typically between 30psi and 40psi (or 2 bar and 2.8 bar). How to test your tyre pressure
SEE THE DIFFERENCE. Watch the video to see the RAC635 in action, and scroll down for more information on the award-winner ALL THE EXTRAS. Includes LED light with three settings (bright white to illuminate, flashing white for attention and flashing red for SOS), three piece valve set for bikes and balls, and case for tidy storage Plugging it in and connecting it to your car’s tyre valve is very easy and intuitive, although you might miss that torch function of the 635 if you’re attempting to do it on the side of a dark road. The three-metre power lead unwinds easily and is long enough for most purposes. It’s noisy, dishing out 77dB in operation. And the pressure gauge can be difficult to read since, because it goes up to 250psi, that crucial 0 to 60psi zone is crammed into the first quarter of the dial. However, it pumped up our test tyre from 20 to 30psi in just under two-and-a-half minutes, with no fuss or faff. It’s a shame that the supplied accessories are so basic – just a ball inflator and two adaptors for inflatable toys – still, if you’re looking to spend as little as possible, then the Storm Force Mini does the job.The RAC 610 doesn’t do anything particularly fancy - it goes without the torch and flashing light of the 635, as well as the automatic cut off. It’s a small, lightweight device with an air hose that wraps up neatly and a wire to plug into your car’s 12v power outlet. Does it work?
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