The starting size really depends on yourself, sponsored drivers do not really have to consider tyre life so can start as small as they like, us chaps that pay for our racing draw a compromise but when you consider that you can destroy a tyre in one heat as well!
I start at 46mm rear and 44.5mm front, some of my mates start 1mm smaller than that, so as I say, the choice is yours!
Happy grinding.
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