I don't think you need a new wheel, LOL
But wheel damage can cause leaks, be it a bent spot, damaged from trails(rocks and like), or could be a BAD tire, that has tire damage to it where it needs to seal
WHO mounted the tire, YOU or a shop?
to rule out the tire you can, mark tire where its leaking now, then deflate it, and spin it on wheel and re inflate and see if it still leaks in same spot on tire,
if same spot on tire, then its the tire that has damage
if the wheel, then the wheel has damage, if steel wheels, they can be bent back pretty easy and be good to go again
if aluminum?? well you might be able to smooth out the area to get a better seal, but if damaged enough and or cracks, its time for a new wheel!