New tires and rims 18 inches on it – Strange driving behaviour

Hi, yesterday my Omi (Caravan 2.2DTI, BJ03) donated a set of new rims and tires. It is about the 6 spokes OPC rims 8J x 18 ET 39 and Conti ́s 235/45 R18 98W. At the beginning the tires had also ground on the spring plate, the problem was solved with 40mm track plates (per axle). Before winter tires were mounted on steel rims 16 inches. Since the tire assembly my Omi somehow drives strangely, has to fight with him. Difficult to describe.. arke shock transmission to the steering wheel, with bad roads (which we have in the “east” enough) the steering wheel pulls in all possible directions..no grinding noises detectable that driving becomes more difficult than with small winter tires is clear… on smooth road it runs great, also no imbalance available. Am now a little skeptical if this something doesn’t quite work out…Federwegsbeschreiber get on the VA in any case! . Thank you and greeting Marci1808