big tires = bad bearings?

[vroom]

I heard that big tires (my mudshark 22's) will ruin bearings and put more stress on the axle, is this true? why so?

[lil400exman]

well yes anything with more weight on it will stress it out more but bearings are a wearing part and never heard of bigger tires prematurely wearing them out but i do know for a fact that mud and water do and people probably get the 2 confused like right after they installed new tires the axle bearings wore out but i know alot of people that run 22's on 400ex and 250rs and it doesnt do a thing to them!;)

i got 22" dirt devils & i think my bearing went out because the chain keeps coming loose...or the chain is old & stretching...either way I love these dirt devils & I will be getting another pair soon (3,200 miles on them & still 25% tred left :D ) http://www.imagestation.com/picture/sraid73/p108545a28af78cb7b05ebd1bffe5e096/fb7aac2e.jpg