Well, after 12 years it's time for some new shoes. What size are stock and which new tires are decent. I mainly ride trails in WI and around the farm. Not too many rocks or deep mudding.

 

the 335 doesn't have alot of power so if you go w/ bigger tires, it will hurt the power even more. i used to have dirt devils on my 335 and they did great for mud(back in the day). swamp lites are a good tire as well.

 

Your going to have a more limited choice because the 335 has 10" rim front and back, the fronts are 23" tires and the backs are 24" tires. But there are plenty of tires for 10" rims out there, stay with 6ply tires ,that ATV is still a 670lb tank even if its a 335.

6ply ITP Mudlite "AT" come in 23x8-10 and 24x11-10

 

tlc you are incorrect on the front tire size stock on my 2000 sp 335 had 12" rims front 10" rims back. unless its a 99 then it may be 10"

 

I was just going by this site. Maybe its a misprint. 1999 Polaris Sportsman 335 ATVs

If tires for 10" rims get hard to find ,like mentioned "Swaplites" are another to look at.