this thread has me lolling, but it's also quite interesting. i won't understand chain tensioners until i see them in action, but i've been considering getting some-- i have no clue how to 'properly' tension a chain and it always has one spot that's looser than the rest... not to mention it's just never as tight as i'd like it.

edit for a stupid question: my floor pump (i just got one last week, thank christ) has an air guage on it, but it only reads how much air is being put into the tire... so if i don't feel like flattening them and starting from empty, how do i know exactly how much air is in there?