BEEF706, thanks for your reply, i appreciate it.
i have been using the M12 on the back of my 250F and i like it alot. the last time i replaced it, i almost went to the S12 but i backed out since i haven't used it before.
i am pretty much staying on rocky trails exclusively from now on, because deep down i love the stuff! no-one else likes riding in it, so i guess that's why i want to become good at it. on long, steep, rocky hills, the H12 doesn't really last all that long. i guess i couldn't expect any tyre to, but i have always wondered about the H12 i've seen at the shop many times. i'm guessing it would make a fantastic tyre for these rocky hills, since it is a hard terrain tyre, right? :think