Put the babies on today. Gone for the 55 rear, slight problem the tyre could touch the rear hugger. Might put some washers on. If I reduce the pressure to 38 would this solve the problem?
I know people who run both 190/55 and 180/60 with no problems so you should be ok. As for tyre pressure, I would run whatever gives you most feel/grip not what provides clearance. Will reducing pressure not only make it flatter at the bottom..lol
Mine just skimmed the underside of the OEM Hugger at 100mph + speeds due to 'Tyre Grow' but it's not a problem at all.