can any one help i use my lexus is 200 se for work (naughty i no.) and there are a lot of tools in my boot pluse some times a steps on top it might also be full up withnpeople too so lets say every thing is on the car would 18" wheels be ok or should i go with the 17" to be on the safe side barring in mind the 18" would be 225/40/18

what sort of work do you do mate ?

the right size wheel will fit, either size
and you shouldnt have any problems
might need to put off any lowering plans though

aint gonna lower at all i work installing access control and cctv so you think i should go for the 18" and it wont rub out with all that weight in it?????

no it wont rub...

I may have put off lowering plans, due to lots of jounery to heathrow

Mines lowered, and does an awful lot of trips to Heathrow..... no problem..