cant find my usual tyre site but then I do not usually look up rim widths very often. If I mount new tyre I will or change a rim I will but then everything else follows as the same. Find a couple of sites just to check tyre against rim width no need to take my word. It is not an arbitrary just as tyre pressures are not arbitrary they are all worked out by the tyre/tire association or something similar and are I think world wide accepted figures. When we change tyre sizes we really ought to check on pressures also, especially if selecting something ones car manufacturer may not have quoted for. There are many tyre comparison sites that can do that for us it is not just such and see. most tyre places will stick to recommended widths but of recent I have noticed some ignoring it perhaps to satisfy a pushy owner or just take the money but they will also share responsibility if something really bad happens such as a rapid tyre deflation at high speed resulting in a serious accident. I can not sat that is why you have had a particular problem with your tyres but it could be certainly not wise to be outside of recommendations they are generous enough.
Good luck with what you decide is the best way forward. Happy motoring!
