I was busy so sent my wife to get the tyres fitted, talk about taking advantage of a woman on their own. Said the wheels were badly corroded on the inside and needed grinding and a layer of " special" sealant to make the tyres seal (on a 2010 plate car), only £10 per wheel instead of £20 what a bargain (NOT). luckily my wife got them to call me and i told them that this was part of the the fitting. I told them just to fit the tyres without the unnecessary grinding and magic sealant and guess what, 4 weeks later the tyres are still up with no loss of pressure. Also the tracking needed doing. Won't be bothering using them again.