X6 style 259 on my 4.8is - need advice asap

[four.8is]

Hi guys I found some X6 wheels style 259 in really good condition with brand new all season tires on them (ok for upcoming winter) .

I was thinking to throw them on my 4.8 and save the 168's for the summer since the diamaris are almost brand new.

Question 1: Is it okay to run the fronts with hubcentric rings?dont want problems down the road.If yes, metal is best right?ECS? Thx
Rears will fit no problem(72.56 mm)
Fronts not really (74.1 mm)- need rings

Question 2: The X6 wheels dont come with the TPMS sensors..will I be able to use the ones on my wheels or will I be better off getting new ones?

Question 3: On a 11" wheel, is a 325 tire better suited or 315 just fine?

Question 4: Below is the comparisson between the offsets.How will it affect my setup?I have 30 mm spacers in the rear.None on the front.

Offset calculator says the rears will retract 1mm while the fronts will extend 11 mm .but keep in mind that the new ones are a little wider even though the same tire size as mine.
With the spacers I should be the same in the rear and stick out 11mm more in the front am I correct?


Style 259
ET 40 - f 10"
ET 37 - r 11"

Style 168- 4.8IS/4.6is OFFSET
ET 45 - f 9.5"
ET 30 - r 10.5"

Thanks guys looking forward to buying and installing them this weekend if everything goes smooth.Here I found a link with them on a E53 .Not bad for a winter setup !

Genuine Style 259's with virtually brand new Tyres