Hi, ive just bought a new jockey wheel complete with pneumatic tyre as I'm fed up of my previous wheel sinking and slicing the turf on site and as i have a slight kerb on my drive it'll be a softer drop with my mover, I know there are pros n cons but my local dealer said this will do the job, however on fitting and trying out the tyre went practically flat dispite 2.5 bar of pressure the max weight stated on tyre is 250 kg can this be right ???