New wheels and offsets

[mystic sport]

I am looking at a set of ACS type 3 racing wheels tomorrow. All four are 8.5 18" and I will be swapping my 225/40/18 and 255/35/18 michelin pilot sports on to them. The wheels are reps, now normally I am a sickler for OEM but I need new rims asap due to a bent wheel and loss of pressure due to the bent rim and cost at the moment is an issue and I have managed to strike gold on the deal as all in it will stand me in the region of £380 for all four as I have crappy 16" rims to PX and the seller is cutting me a good discount on top. I am getting the bent wheel repaired (BMW say it will be fine for this) but the car cannot be off the road for a day let alone however long it will take for the repair (i guess two to four days) hence the reps. The rims look a bloody good copy and are of very high quality. Anyway, with the rim and tyre width taken into account and the fact i am running standard sport shocks with eibach pro kit springs what is the offset I need without calling for any arch rolling. I believe the standard offset of my current type 135s is et47 front and et50 rear. With the front rim going from 8 to 8.5 will I be in trouble?

[Nickleback]

I've just done the same except with OEM ACS T3R's. If yours are good copies 8.5 all round then the offset will be 42 given with the stretched front tyres, so no need to roll the arches - in fact you may need 7mm spacers all round to fill them fully :D
This is based on them being exact copies so I would check carefully Paul [read
I'm sure Nick will be able to confirm for sure ?

[Afif]

im running 19inch 8.5 hamanns all round with pro kit. 235 up front.. 255 on the rear. No rubbing unless under heavy load and cornering hard :D. Cant remember the offset though but replicas usually have very forgiving offsets so you should definately be fine with 18's [ok.