I ride in mostly loose dirt, sand, and gravel. Which tire would be the best for my conditions?

 

I'd go with the Razors. They seem to do pretty good in all of the above.

 

Dirt wheels did a tire shootout a few issues back and they rated both of those tires good for all terrains. I myself run a set of Shredders on the Zilla and I like em, they hold their shape at high speeds. I don't think you would do bad with either tire.

 

i got shredders on my quad and i love them they grip in hard and soft so i would go with shredders instead of razors.

 

I run shredders on everything I own. I had em on the banshee I just sold, they are on my 250R (310) and I am probably going to put them on the R I just picked up. They are a great tire and they hold up well to all kinds of off road abuse. The only down fall is the front tire sizing, no 22x7x10's, only 21x7 (which are a little small) and 22x 8 which are too fat, and 23x7x10's which I have on my machine. They are pretty good for desert/dunes/ cross country, but a little lacking on the moto-x.
My buddy runs the razors and he likes them, but it looks like they wear a little faster. He has a 400 ex and doesn't spin as much as I do and they still look like they wear faster. Here is a tip for everybody in the market for tires. Discount Tire sells GBC and Maxxis brands very cheap. I buy all my tires there. 114 bucks for a set of rear Shredders. You do have to order them, but it takes less than a week.