My reasons which you might disagree with:
Originally Posted by F30AM
Not for me:
19" Wheels. Impractical. Ruin the ride. Expensive on tyres. Very difficult to fix. Impossible to get Wheel Insurance. A definite No no
Must say I'm a bit puzzled with this comment. Impractical, why? Having drove in 18s previously to the 19s I don't notice any difference, the suspension tends to make the difference IMO. Expensive on tyres, marginally, lets be honest if we're buying brand new BMW's I think the marginal increase is pretty insignificant really!
Personably I love the look of them and I feel they make the car!!!
Easier to kerb. I am crap at parking. Too many spokes to clean.
Difficult to fix:
Because they are diamond cut. Without a wheel for a day as they need to be machined on a special lathe. Hence without a car. 18" are painted and can be fixed quickly and more easily with a smart fix (outside the house). Cheaper to fix due to Wheel Insurance. Diamond cut can only be fixed once.
Not available as they are diamond cut.
No question that 18" give a better ride and produce less road roar. I've compared them very carefully.
19" look nicer but not overly so. 18" also look great with a more delicate look.
Tyre costs and availability:
18" tyres are more easily available. I am too mean to pay that 'little bit extra' for 19" tyres.
Therefore, 5 out of 6 in favour of 18".