I have a set of Toyo Proxes T1-S in the stock size on my GSR. :thumbup:
I think it is a great tire. Great handling, tread life and comfort. Treadwear rating is 280 (which is rather high for a max performance tire). Traction=AA. Temp=A.
Compared to the stock Michelins, they are better in every respect except for having a little less comfortable ride (which I can surely live with!)

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SCC did a write up on performance tires in the May/June/July/August? issue.
Gordon.