I need to decide which set of tires i will use this season for XC racing. Im looking for a lighter tire, with tread that rolls fast and performs great in dry/ dusty conditions, as well as loamy dirt, and possibly a little moisture, although this would be for central California, in March and April so i'm not too concerned about rain at all. What are your recommendations? The tire needs to be light, as well as narrow, i am looking to run 1.9 rear and 1.9 - 2.1 up front.