I ran 195 45 15's on my old fez but when i went for new tyres i couldn't get the 45's again so had to have 50's and trim the front arches,

I wouldn't advise it to be hones as after doing that the shit liner became insecure and bounced up and down hitting the tyre so that had to come out aswell, Thats my experience anyway don't know about anyone else HTH