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Can't vote. The BT023 and its GT variant are still available here.
My vote would be currently BT023 (GT optional), possibly moving on to the T30. I'm trying a T30 on the rear now, so far so good, possibly better than the 023 for stability in less-than-perfect-surface corners.
Sure you can vote. See the last choice (other)
Edit - Interesting... I just went to
Bridgestone's web site and they list the T30's as "Sport Touring" and still list the BT023's, but as "Touring". All of the US vendors are clearing out the 023's and only carrying the T30's now. I gues B'stone reralized the T30's would not last as long as the 023's when they came out with them.
For those talking about running the rear tire at 43 or 44 psi, are you aware that these tires are all rated up to 42 psi max pressure? I know that isn't a huge amount higher, maybe even within the tolerance of accuracy of your tire gauge. But if your gauge is reading a bit low and you pump it up to 44 psi, then take it out for a hot lap...