The PR2 is being phased out and there are only select sizes left. It was a great budget option that looked like a sport bike tire, but gave great mileage, wet traction, warm up time and decent dry weather traction.
The PR3 has taken all the good qualities of the PR2 and expanded on them, the only drawback (if you are really picky) is that they do look a bit strange on a sport bike. Its a fantastic tire for dry and wet weather grip, incredible tread life (15-20k for most sportbikes/medium sized sport tourers). I wouldn't chose these for heavier bikes as there are reports of excessive tire cupping on those applications.
The PR4 expands on the PR3 range.
The they have three distinctly different tires for different applications.
PR4 - standard sport touring/sport bikes, etc
PR4 GT - heavier bikes >570lbs.
PR4 TR - dual sport bikes that are used 100% on asphalt.
From my conversations with Michelins tire engineers the main benefit of the PR4 over the PR3 is being able to have a tire that is tailored for your application, and seeing a slight increase in tread life. I have had a few more spirited customers say that their experience was that the PR4 gave up a bit in dry traction in comparison to the PR3.
I hope this helped, feel free to give me a call if you need any more clarification on the Pilot Road range (or any bike questions in general
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