I use the Bridgestone M401 60/100-14 Front & M402 Rear 80/100-12.
They are good for Intermediate Terrain, I use them for trail riding & do great..well at least on dirt here in Cali.....IMO (opinions are like a$$holes, every ones has one!!!!)
Some may tell you to use The Dunlop 756's or The Michelin MS2 for softer dirt if that's what you ride in out there.