My local dealer has an extra set of both 19's and 20's for my LP580-2. Just wondering which would be better as an extra set for track use only. I see that Cup 2's and Trofero R's don't come in the 305-35/19 only 305-30/20. I feel that having more rubber on the side wall would give me better stability? Any other tire recommendations in 19's or 20's

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