Funny you mentioned punctures on the PR4. There was a forum member here, who long ago got a puncture on a rear PR4 that had only about 100 miles on it since new. That person refused to ride on it anymore, so I bought it, put and internal patch/plug in it, and rode on it until the thread wore out.As 670cc says.
For some reason I am now told by my dealer that the rear PR 4 is not available for the foreseeable future with a PR3 being substituted. That tyre is too sporty for the type of roads that I ride so I am going to give Dunlops a try instead.
I am wondering about the lack of availability of the PR4's for this bike and perhaps it is something to do with them being prone to punctures. On my X-Adv the last three PR4's have punctured, one of them being pierced three times. The current one also has a plug in it.