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The MT ST's have a different tread pattern than the SR's. Both are water friendly. SR's have a softer compound and really hookup for launchs and twisties. Avons are the best if the check book is not a problem. I just replaced my old SR's just short of 8 years and approximately 13,000 miles. Speed rating better than ST's also. Summit is the best pricing and availability.
Gary
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