Originally Posted by zonatandem
Can you put your size 9 foot into a size 7 shoe?
Same logic . . .
Not really. Your foot doesn't flex and expand to a wide range of sizes, b/c it's size is constrained by bone. No such problem for a tire. There's still a logic, and it'd generally have you not putting 2" tubes in a 1.5" tire, but it ain't much comparable to feet and shoes.