This portable air compressor is powered by a 12v standard cigarette socket which is fitted in virtually every car. It comes with a pump adapter so it is suitable for balls, bikes and other inflatables products. So when your tyres need inflating you do not need to wear yourself out with a regular bike pump, simply plug the compressor into the 12 volt socket of your car and check the pressure by using the gauge. Sounds ok for £6.99. I don't see why this wouldn't be ok for car tyres. Possibly inflate a little slower than more expensive ones - i would think.