Hey all,

I've had my new road bike for about three months now, and just got a third flat tire over the weekend -- all have been on the back. I ride mostly to/from work, on pretty poor roads, with a lot of debris (gravel, glass) and thru construction sites. Often in the dark.
Anyhow, the point being -- this third flat is apparently the result of my poor patch job on the second flat, because there are no new punctures that I can find, and the patch has bubbled up and audibly leaks air when the tube is filled. I removed the patch to attempt a new one, but the remaining glue is not easily sandpapered off -- it seems I am actually digging up chunks of the tube as I am trying to remove the glue.

So... at this point, should I just ditch this tube and go with a new one? I would like to learn how to repair a tube correctly rather than just buying a new tube each time I get a flat, especially at this rate... but, I don't want to keep trying to patch and end up getting another flat if it's a lost cause...

Thanks for your help...