I've been running (first and last time) a PR3 front tire on my FJR for the past 5 weeks, unfortunately that's how long it took to trash this tire
It was toast at around 5,100 km, but given how ridiculously expensive tires are over here (one FR costs about the same as a full set in the US), I wanted to see if I could squeeze another ride out of this POS PR3 Front. Had I known how uncomfortable this short 389 km ride would be I would not have bothered. The damn tire was slipping and sliding a number of times on dry, warm roads, and equally badly on the LHS where it still had some tread left.
The other weird thing is that the tire felt like it was made out of wood, translating every little bump and road imperfection into the bars/steering.
Notice the trapezoidal wear, makes for very hard and unpleasant quick transitions such as you'd find riding Touges. Also the excessive scalloping.
Stay away from the PR3 front! Looks like it's back to the PR2s for the FJR.
The PR3 rear is not looking too good either, although it's newer, but I doubt it will last nearly as long as a PR2 rear would under the same conditions/use. The rear too, is showing a lot of scalloping particularly along the thin slits.
Here are some pics, this tire only has 5,500 km on it.