... fix a flat... but you DO get rusty.
I haven't dealt with a flat in over 20 years. 'Course I wasn't riding during those 20 years; that's one way around the problem. Two miles from home last night, something didn't feel right. The bike felt loose and bouncy in the back end. I looked down at the tire and -yep- it was awfully low. Not knowing why I should have a flat -visual inspection didn't turn up anything- I pumped the tire back up and off I went. After about 150-200 yards it was down again. So, I figured I'll just keep stopping and pumping and limp back home; it's not that much farther to go. It didn't take long to figure out that wasn't gonna cut it and there's no way I'm climbing the 11% grade home on a loose tire, it's hard enough as it is.. So, I started walking it home but I thought "Damn! I'm not walking back - I have patches. I have a spare tube", so I plunked down on a bus top bench, pulled out my tire "irons" and yanked of the wheel. Hm. Now what? I haven't done this in a while... OK, pop the bead loose -CAREFUL of that tube, don't pinch it. Tried to pull the tube out and find a hole... nope. OK, just take the whole tire off the rim... hm. still can't find the leak. Alright, then, just replace the tube and deal with patching after I get home... And there it was. I remembered how but I was fighting it, just like the very first time I had to do that on the road. Probably -surely- would've gotten home faster had I walked
I did find the leak but it was in an odd place.