Offset varies with wheel width, obviously.

It shouldn't - the offset is the distance between the flange and centre of the rim - going wider or narrower needs the ET retained otherwise steering and suspension geometry can be adversely affected.

It depends.

If a wider rim has the width equally divided about the centre, then I'd agree.

However, many of these 'Fandango' type, wide wheels don't have sufficient clearance inside the centre line and consequently the aditional width's all on the outside.

However, many of these 'Fandango' type, wide wheels don't have sufficient clearance inside the centre line and consequently the aditional width's all on the outside.

I agree that's what they have to do - but it does play havoc with steering and suspension angles.

I checked on oponeo and found a set that say offset 45. I thought I'd double check with RT, who mentioned angles, if I should bother about being a mill out.

Had an e-mail back from mytyres who say "Please be advised that the information on the website for the complete sets of wheels is listed with the approval of each car manufacturer"

I've checked every variation of an i20 to find a set with offset 46 but no joy! I wonder who's approving the data as I can't get anything out of Hyundai.