I put Conti Road Attack 3's on my Racer at around the 3,000 mile mark (stock tires were worn to tread wear indicators).
I had heard of all the transformation the Conti tires make, did not really believe it, but oh my, it is true! So then I felt dumb for waiting 3000 miles to do it. Looking back, I would have asked the dealer to put them on before I picked it up. Why waste 3000 miles with the stock tires. Swap them out as soon as you can!