I'm looking for 18's for the stock rim what would you guys recommend for really loose dirt

Maxxis Razr MX medium to hard compound.

In my expirience, I'd have to say the Holeshot MXR6 hands down. They bite pretty damn good in the loose stuff and you can still control your quad with them in the turns, plus they won't wear as fast as they would on hardpack.

mxr6's are very good, but the best....yellow label razrs.

That's what I'd like to run, but damn they're pricey. I run the regular RAZR MX's and for me they seem to work better on cleaner surfaces then a loamy one...personal preference I guess. But like I said, I've never tried the Yellow labels on loose stuff so I may surprised.

I've never ran the yellow's personally, but know people who have. They said they stick in everything but wear extremely fast. The cheapest I've seen the yellow labels is around $90 a piece. You can't go wrong with the mxr6's either though.

MXR-6, they grip on the loose stuff nicely and they still have plenty of bite on hard packed.

Kenda Klaws are nice two, becasue you can flip them for hard pack and loose.

i am running a 19" mxr6 on the real loose tracks and it seems to work wonders. when everybodye else is draggin swinger i can still bust through the big groove and power otta the corner. the only downfall is i believe they ooly come in a ten inch rim..

i picked up some kenda klaws :P that way i can reverse them