2006 120D M Sport Wheel Sizing

[shadowface]

A note to mods: I just noticed a Wheels & Tyres section, if you feel that it's more relevant, please move the topic there.

I was wondering if anyone could help me pick the best fitting wheel size for my 2006 120d M Sport (E87).

Currently, I have a set of genuine 207M wheels, with the sizes as follows:

Front: 17x7" ET47 (205/45 tyre setup)

Rear: 17x7.5" ET47 (255/40 tyre setup)

I would like to replace them at some point with 18" aftermarket rims and run the following tyre setup:

Front: 235/35/R18 (+6 mm difference to diameter)

Rear: 255/35/R18 (0 mm difference to diameter)

Can someone point me into what sort of size should I look for when browsing for 18" rims to run such tyre sizes (I like 'em nice and wide!)?

[Gloco]

The size you mentioned are on mine stock, but yours look great on the pic, why change the? I like the hatch in that colour with the stock wheels....