An xe corsa isn't standard though

A 3.0i z4 with 225 rears is.

id much rather have 255. thats like having an xe corsa on 175/65/14s

Yes, but the 'se' spec comes with 225 rears with the same engine. The sport spec has 255 rears.

Should they not be 255 rears?

That's odd. They're 235 wide on the rears aswell which should be able to handle the 230 bhp perfectly fine. they have 5mm tread on aswell.

See, I'd say exactly the opposite about the ZZ3; I thought it was a great tyre on fwd and Quattro cars; not tried it on a rwd car though. Good wet and dry weather performance and the tyres didn't fall off a cliff as they wore like some other brands have.

I'm running ZV5 now on my Jag and quite happy with them.

Got avon zz3's on the rear of mine and they're don't exactly inspire confidence. Makes driving quickly.a bit unpredictable which is fun and scary at the same time.

Different compound though so could be completely different.

better than the cheap chinese crap you usually stick on.

Any good? National have got them at 50 per corner which is as cheap as the usual Chinese crap I stick on?