Why's that, mate?
Its just that many sports cars tend not to go over 225 or 235 on the front as this can create a little bit of understeer due to larger wider footprint. IMO the zeds steering is perfect with 225 it comes with up front. Since fitting 245 the front wheels just seem a tiny weeny bit numb when turning the wheel IMO. I prefer a more point & shoot, sharp turn in that IMO 225 /235 would give you a little more of. Also going 235 will stiffen the sidewalls more than 245.
Its one of the reasons why the Vauxhall Vx220 has such amazing precise handling is due in part to its very skinny front tyres.
Makes sense.