Re: Flatless Tires or tubes ????
for me? Nope. My rear tire is PERFECT the way it is...
I was thinking about the previous post of "squirrelly"...I had that feeling too, thinking I was underinflated in the rear...but lo and behold, my rear cones were loose! This will let the wheel shift horizontally to the hub, giving you that feeling, too. (I also thought it was coming from my suspension seatpost, which allows a bit of side-to-side rotation. I found out that it was purposefully made like that to support wider seats so pedalling doesn't rash you up.)
Anyway, it's easy to check the cones for the correct tightness. With the bike standing up, try to push the tire as if you're trying to push it off the rim. Just use a finger or two...and watch the hub. You'll immediately see it if it's loose. If it IS loose, well, now's a perfect time to re-lube the bearings. NOT A HARD JOB if you invest in a couple of cheap cone wrenches.
Anyway, hope that helps.