I guess I see no reason for not giving the Challenges a go.
Tour magazine did a "wide racing tyres" test in 2014, which included Challenge PR and Conti GP4000S II (28mm), but not Vittoria Open Pave: Conti beat Challenge on every count.
PR was slower than even a 23mm GP, had the worst puncture protection of all tyres tested and Tour noted that "Tyre gives little feedback as regards grip limit and suddenly slips when over the limit."
I fitted OP last Autumn and haven't removed them: no punctures or serious cuts (lots of flint around here); the rear will need replacing soon.
I think I remember reading that you were building your road bike up around wide tyres so I'm sure I'm telling you what you already know, but you might want to beware the Challenge PR sizes. They are flipping huge.
Tour magazine did a "wide racing tyres" test in 2014, which included Challenge PR and Conti GP4000S II (28mm), but not Vittoria Open Pave: Conti beat Challenge on every count.
PR was slower than even a 23mm GP, had the worst puncture protection of all tyres tested and Tour noted that "Tyre gives little feedback as regards grip limit and suddenly slips when over the limit."
I fitted OP last Autumn and haven't removed them: no punctures or serious cuts (lots of flint around here); the rear will need replacing soon.
#OPandlatex4lyfe