Your children’s or grandchildren’s favorite toys don’t belong down there. Firstly, there’s again the well known risk of mold and mildew. Secondly, basement storage means you’re risking water damage because of burst pipes. Thirdly, the brutal cold and intense heat you could find in a basement without an HVAC system can also cause the batteries inside electronic toys to burst. And lastly, pest damage.
Placing your bike in the basement may keep it out of the way, but it can also make it quite unusable when you need it most. Also, the temperature fluctuations from your basement can cause your tires to lose pressure, so it’s always best to store it in a more climate controlled room.