wheel width

Currently running 245/40/20 on the front of our van looking at 265/45/20 I’m not lowered yet but could be happening in the future! How do I tell if those 265’s will go without buying them and trying them? Thanks!

Hi All, Can anyone advice me what is the max set up that fits T5? With wheels just in arches? I have nice wheels I realy like and want to keep. The size is 8x19 ET 43 with 235/45/19 tyre. Unfrotunatelly need to use adaptors to go from 5x120 to 5x112. It will widen wheel of additional 20mm...