If your gonna slam it yes you will need to change the tyres but if your only goin down 1 spline & levelin at the front you will get away with them tyres but the occasional rub on the arch when going over a bump..
Andy
Nice bus m8!! What size are you running? They sseem a little wider than stock?
I have some lower profile tyres with a narrower width ideal for a lowered van - I think they may be 175/60 14, running painted wide 5's with hubcaps, i am prolly now not gonna go lower, hence i may want to part with mine - they are new tyres, and were bought from Gadgets panel with the intention of lowering mine, but I think i am looking to change to stock whitewalls - so if you think of changing - I'd do a deal with yours v mine or something?
Dunno if this pic gives you a idea?? Mine is stock height etc.....But you can see a little tuckage with these tyres, which would clear the arches - but i fancy a change of direction with mine.
I'm in Somerset - just outside Wincanton. If you decide to sell yours - let me know?!
Or meet up somewhere for a cider and compare busses?