Have had multiple sets of pr2's and pr3's.
This season I put on a set of 023 gt's and have to say I'm pleasantly impressed with them.
The PR series offered more wet weather confidence and long lasting milage, but I didn't like the wear characteristics and wear. Rear tire would feather pretty bad and the front would feather and wear at the 45d more then the center and outside edge.
All in all the michelin PR tires was a fantastic tire and will hold it's grip on a 600lb bike to the edge.
Just got back from the Gap on a new set of 023's GT series and the cornering grip on these tires is amazing
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Have about 4k on them and so far seem to be wearing nicely with no signs of chopping or feathering. What I will say about them is they are much slicker on wet and cold roads then the Michelin's.
The 023's are fantastic tires for aggressive "sport" touring and knee dragging but I feel they lack in the wet department. Mileage seems to be on par with the PR's with no abnormal tire wear as of yet. These tires will hold there own at full lean angles with great feedback.
Pr series, good all around "touring" sport tire with good wear, excellent wet weather grip and overall decent mileage. Noted abnormal tire wear when pushed hard (knee down hard).
Not as confidence inspiring in the twisties as the 023's but will still hold there grip to the edge of the tire.
All in all the 2 tires are just as alike as they are different.
If you are an aggressive rider that dosnt do much commuting or wet weather riding go for the 023's
If you are more of a touring rider with the occasional knee down every once in a while and use you bike in all weather conditions then I would have to say the PR's are the way to go.
On a side note. I didn't notice much difference between the pr2 and pr3 tires. The 3's seem to be more "squishy" when hot out, personally I like the pr2's better.