Has anyone fitted or tried to fit bigger wheels to a Jurgens XT65?

I know it comes standard with 14s but it would just make a lot more sense to me if one was able to fit 15s to it. Will also allow it to reach a lot more “remote” places.

I’m just not sure if it’s possible, i.e. if the body and fenders allow for it.

If you have managed to do so, please share pictures.