Rode 50 miles on brand new Challenge Strada Pro Series 25c tires.  Nice!  Impressive tires all the way through.  Easy to mount but the fit on the rim looks very secure.  (I say easy to mount because getting the last part of the bead over was no t difficult, but getting the tire to stay on the rim and the tube to stay in place was a a challenge until I took rope and periodically took two wraps around the tire and rim and ties it off.  I hear the second time is a lot easier.)

Tires are big and fat.  I didn't put calipers on them but they look a lot bigger than Vittoria Open Pros.  They have the file tread of the old Clement Criterium Setas (but not the Seta's centerline ribbed tread).  They roll beautifully and feel like you will always get a second chance if say you hit gravel on a corner.  Comfy over construction zones and on chip seal.

I was hoping to get tires that would give me confidence going down crazy descents fixed at Cycle Oregon this summer.  Still not sure I am going to do it, but one concern is allayed.  These tires feel completely up to that job.  (And if we go off road?  Is there a better 25c tire?)

I paid $75 ea at a small LBS.  They turned me on to them so I don't grudge that at all.

Ben