I am very careful to air my tires before every ride - generally before it goes on my bike rack.

I have arthritic hands so changing a tire is very hard for me - the problem is getting those last 6 inches of tire back on the rim. When I practiced it actually took me something like 2 hours from beginning to end for that reason.

Now I have a trunk bag, I understand there is a tool that is safe to use to assist getting the tire back on the rim