i have a Renault Scenic II and it has factory fitted 17inch alloys, but uses an odd size tire 205/55/17 these tyres are not always stocked as not as common and do cost a fair bit for a daily hack, i was thinking of changing the tyre to a more common profile, maybe 215/55's or 215/50? but was thought i had better check first but dont know any tyre fitters well enough to get any advice either way, renault have told me that whilst changing the profile is something they dont recommend (but couldn't tell me why lol) any change should not interfere with my trye pressure sensors at all

Any help greatly appreciated chaps