What mx tires should I get?

[TrapZ400]

What mx tires should I get? I need some tires that have good tread life and arent extremely expensive. The tracks that I race at have hardpack dirt with some rocks in it so it makes it slick and really easy to spin out and really hard to corner if you dont have the right tires. Thats why I want to get rid of my stock tires because they are really worn. My practice track is a sand track so I want tires that will work good in sand too. What mx tires should I get?
Do I have to change the gearing since I will be using smaller tires?
Any help would be appreciated. Thanks

[mx1791]

kenda karleys(sp?) claws and razr MXs are cheap and last forever. turf tamers are cheap and good on hard packed too

[FREE RIDIN]

Kenda claws

[400exrider707]

For hardpack and sand mix, I'd get Kenda knarly ST rear tires, and for the front kenda klaws. You could also get klaw rear tires, they will last longer, but I prefer the extra traction provided by the knarly rear tires. I would also just leave the gearing stock.

Fronts - 20x6x10
Rears - 18x10.5x8

[allstock]

knarly's

[BlaineKaiser450]

i like razr mx tires for mx