I put zv7s on my 2012 Plus 4 Sport last year and am pleased with them... although I haven't tried them to their limits on a track. I did find that the original zv5s and the wider rims of the sport were rather all or nothing when I went round Snetterton.... lots and lots of grip then suddenly no grip. But that could have been old tyres or driver incompetence :-)
I was astonished that for the zv7s National Tyres were the cheapest and could actually balance wire wheels (well the Ipswich branch could).
