by Workingman » 03 Apr 2014, 11:21
Nothing needs to be justified - you have a flat, they have air!
It's wrong, Ria, but that's the way things go, the solution is to carry a pump.
Don't bother with those cheap ones, they are worse than useless; go for a well built one, and try before you buy. That nice double cylinder one might be too hard to use, and that easy to use single cylinder might be delivering next to no air.
If you are thinking of an electric one to run from the cig lighter then do not be conned by the claims of 300 to 500 psi (20 to 35 bar). These things only deliver a thimbleful of air with each cycle and anyway you only need about 35 psi (2.4 bar) max. Look/Ask for one with the largest delivery capacity (Litres per minute) and a lower max psi/bar rating - 120 psi/9 bar should do.