Well, if they are made of stainless steel, as long as you don't abuse them they should be fine.
The worksman bike i have here at work was left outside for about 4 years
under a roof but exposed to the air. The stainless steel fenders and wheels were orange and speckled with rust. I cleaned them all off with scour pads and
all sorts of industrial stuff and then left the bike indoors. It's not gotten rusty again.
my guess is it will be fine.