Please take this advice from me as someone who has experienced over many years the problems associated with oversized wheels and lo profile tyre combo's above manufacturers specs . From looking online at Multivan specs it seems that they only list 17 inch rims as an option maybe 18's as well but not certain , now once you go to 20-21 the tyre diameter gets smaller and smaller . My personal experience from being in the car busines for now 50 years is that these days with lo profile tyres several problems occur .
1/ ride comfort is compromised you cannot expect rubber bands to give the same ride and comfort as the smaller rim combo would give .
2 / suspension would also suffer from those rubber bands as the shock from road surface is then transferred to the suspension components causing early wear and tear and for my business rattles in the trim parts etc .
3/ I have tried lo profile tyres on my work van on stock suspension and they only stayed on the van for a month or so , it was my back and trips to the chiropractor or them . My back won the fight and I replaced the tyres with correct ones and life is wonderful again . I fit sunroofs to cars for a living and without fail the number one complaint we often get is rattles in the sunroof area , as soon as I see the car I can tell why they have problems . I explain the bit about rubber bands and that any fix to their car will happen again , maybe the other guys will have a different opinion but you asked so this is my take on the subject . Now you would see online more so in Europe that many vans have been slammed with those specs you asked about , you have to remember Europe roads are by far superior to most of ours . I now wait for some others to give their side of their experiences , I hope you get an answer which helps with your decision . This is our current ride on 17's with a Bilstein Coil over suspension shod with 17x 235 tyres 103 rating .
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