Mountain Biking - back tire treads are shredding

So... my back tire treads are gone within two weeks...
But I do the same trails with my friend who's tires are fine.

I ride a Kona kikapu frame, so when i brake, it locks up the suspension. Does this have anythign to do with the shredding? and is there a way to help stop it?

are you skidding on the trails?
dont skid on the trails. it ruins them

how soft are your tires compared to his, rubber wise, not air pressure wise

I ran a Schawlbe Nobby Nic on the rear of my Nomad for about a month, ripped about a dozen knobs off. Just wasn't meant for the riding I was doing.

are you skidding on the trails?
dont skid on the trails. it ruins them

and your ruining your tires is just a side effect. :D

But seriously, don't skid. Its riders who skid that make the government close trails to mountain biking. I know you might think it looks cool, but its not good for your tire or the trail.

no I dont powerslide/skid on purpose.... only when i need to stop suddenly

well.... on steep hills I usualy have to hold the back brake down.. does that count?

well I know when you panic stop you tend to grab the brake as hard as possible, but you actually get more stopping power if your wheels are still moving, espectially on rough terrain. If you find you have to stop really quickly, shift weight to the rear and use both brakes, but the front brake is going to do most of the work. Keep weight on the back wheel to keep it rolling.

Learn to ride like your friend!
Do you have the same tire front and rear?

For practice, roll on a flat, paved surface and try stopping with just the front brake alone. Like BenLi said, shift your weight back. Eventually, you'll find that you go from very high speed to almost a dead stop with just your front brake if you shift your weight so far back the saddle is under your chest and the rear tire is buzzing between your knees which, not coincidentally is also a really good position to be in on those steep hills you've been holding your brakes down on.

It could be you just rip it so hard that no normal tire can hold up the shredding of the gnar.

I've had tires that after 1 ride knobs were ripped off of them .. I put that down as being a bad tire.. usually when you slip off of off-camber stuff and you hear a pop sound from the tire that is what is happpening.. the side knobs either flex or break off. if your "shredding" center lugs that's your fault for sliding.