I am riding a 2008 GSA and went from Battlewings to Tourance followed by Dunlop TR91's (which were the best of the three by far). Needed new tyres and had a serious think about how I had been riding for the past five years and to be honest all on road with the very occasional dry hard trail. Fitted PR4 Trails last week and really impressed with them. Very planted all surfaces and the bike rides much smoother. I did consider the Anakee 3 but am glad I have gone for the PR4. Think hard about what type of riding you do really. Did consider the GT version for my GSA rear but I never take a pillion or too heavy luggage even when touring though the GT version is the only one which has the 2AT technology and would have been my choice for a GSA rear if I did. Here is a reply to my query about this from Michelin;
"In the past we and other manufacturers have produced 'B' fitments or 'XL' type marking's to signify the increased carrying capacity or focus on GT bike fitments. With the Pilot Road 4 we decided to use this new technology to ensure that you got the same rider enjoyment on these larger/heavier bikes as you would on a bike not requiring this fitment.
Hence the answer is that 2AT technology is only in the GT rear, but it is only needed in the GT rear to give the best handling characteristics possible on the larger/heavier bikes that require this tyre.
There is no benefit to fitting this tyre if it is not a recommended fit for your bike.
Safe riding, Sam