Because the price was right on a set of fairly fresh 225/45-15's, and because I have a set of wheels wth no tires on them, I am going to mount the 225's up and run them at Hallett first outing this spring. I have run nothing but 205/50-15 Hoosiers for the past 3 seasons on my ITB Volvo (6" wheels), so I have the tire pressure situation pretty well figured out for that particular size.

The question is... does anyone out there have hands-on experience relative to differences in the starting pressure requirements, if any, between these two sizes (205/50-15 vs 225/45-15) on 6 inch wheels? Yes, I have a probe style pyrometer, I'm just trying to save a session or two of tail-chasing, if possible. Should I start with my 205/50 pressures or would it typically be something higher or lower?