Yes...PR3 is a radial...
Off topic:
You will probably like the PR3. Nice smooth riding tire that does what it's s'posed to. Turns in nice, with out the flitty dancing stuff of the Avon Storm. Mine has 13,200 miles on it, it's about done. It has some braking force cupping on it as 1000 miles was pulling a trailer, two up, through the fun that is the Fla Keys. (on the brakes quite a bit, and firmly. The cupping has not seemed to affect the handling, it's still really good, even worn out. I've never said that about any other tire. I have another that is going on at the Fla Wrench Session on the tenth.
The cheapest that I found it was 120.99 to your door from Dennis Kirk. Things may have changed, but a lot of places were not carrying this size.
On topic: I have about 3k miles on a Venom that will probably get replaced by the 890 Shinko. I've been running Shinkos on my KLR and really like how they work, especially in the twisties, with a D.O.T. knobby. And they work well off road.