S80 – 18 or 19″ alus?

ho since I had to find that in one of my summer bikes (see pictures > here <) a nail plug and this completely goes through the mature and is not flickable loud workshop (because too fast and tire is anyway down to 2en and shit - P6000...) I want to buy new alus now my question is now what does better on nem s80 WITHOUT sport suspension or deeper laying 18" or 19" rims? since actually no "high-legged" elch wanted to have by the new alus.... the new alus... rims should be Tomason TN4 and either in the dimensions 8.5x18 or 8.5x19 pneus I would like to raise in 235/35 or 245/35 - but don't know exactly what the max is so that it doesn't grind... my questions will be taken together again: 1. 18" or 19" what is better or not too "high-legged" with standart suspension on the s80? 2. which width of the tire is possible without any sign-widening or changes to the wheel box?