You’re welcome!
Challenge Criterium SC 320 25mm tires are selling for $51.49 at Probikekit. I guess this isn’t a screaming great deal but they might be on sale slightly cheaper at one of the English or German on-line mail order bike shops. These might be just a bit smaller than the Parigi-Roubaix depending on your rear brake bridge/brake caliper clearance or your fork clearance. What bike are these being mounted on?
I used to to run my road bike tires at 110psi+ front and rear. I gave up on this a couple years ago and now run the lower pressures I listed (~75-80 front, ~82-90 rear) and am enjoying the heck out of the supple ride quality. I did get a couple of flats on the rear at the end of this riding season after about 2,000 miles. I ended up replacing the rear tire when it lost a thumbnail sized chunk of tread one day this past October when I lost control on some chip-seal jamming my gloved hand into my seatstay accidentally while trying to flick off some debris.
The Pro’s Closet had a small quantity of Challenge Strada 300’s for under $30 each last month but they are sold out now. This is what I replaced my rear with. I did a cold weather ride on them 2 days ago and everything runs smooth and fast - no issues.