My main problem now is that I have to store 5 bikes (my wife and kids): I can make room for 2 or 3 of them indoor… I think my road bike and the 2 hybrids in better conditions, but I’m looking for an outdoor option for the other 2…
Just put your most important/expensive bikes indoors and commuters outdoors I guess. Make sure to service all of your bearings with grease before the winter cold and snow arrives, and seal them up as much as possible… Maybe garbage bags around them and THEN put them in the storage box? You want as little freezing/defreezing of water in it as possible. The cold itself shouldn’t really affect the metal and plastic parts as long as it remains free of any contaminants such as grit and stuff. I doubt it’d really rust either if there’s no water as it’ll be very cold… Good luck!