The only Yokohama I see in a 215/60-15 is the AVS ES100. In a 295/50-15, all I see is the AVID S/T. The ES100 is a great tire, very sticky and V-rated. The AVID S/T is a decent tire, but T-rated and not in the same league as the ES100.
The Toyo Proxes S/T and Proxes 4 are much closer together in terms of speed ratings and performance. I spent a lot of hours looking for tires that came in sizes I could run at both the front and rear, and never did come up with anything better than the Toyos.
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