bikes take up a lot more room than you would think, the more you take them apart the less you will ride them
with front tires removed and handlebars turned the pedals are the widest part and 2 bikes will need 30 inches x about 60 inches for storage (this is one reason we are looking at different options to get them out of the garage/bedroom
possible be on back porch area with spare tire
4 bikes and a tandem is a lot of space