Either the reds or yellows will do the job fantastically, offering loads of feel, ime the reds tend to be a bit dirtier than the yellows, but need zero warming up, the yellows work perfectly well just not their best for a few miles before a little heat is there, the dust of the yellows is more transluscent than the reds so don't need to clean wheels so often, but are a harder pad more suited to track use, but 100% legal.
tabetha