Originally Posted by Wilfred Laurier

on road bikes ridden solely in good weather i also have never worn out a rim
but on mountain bikes with rim brakes
the rims sides are noticeably concave after a few seasons
and circumferential cracks follow soon after
and i have seen dozens of all weather commuter bikes belonging to customers
where the rims have worn out to the point of cracking

perhaps you should try riding fast enough that you need to occasionally use the brakes