I was dressing up my front tire when i noticed this. The bubble is about half an inch in diameter on the sidewall. I'd love to replace the tire, but the key to my lug nuts is 50 miles back at home! What should i do? I figgur i've been driving on it for a while too!

 

It's bubbling out? Replace it, that's an extremely weak spot now.

 

yes replace it. Some shops actually have the keys for lugnuts incase you loose them. Check around at ships and see what they can do. Chances are your lug key isn't 1 of a kind