1. 100 psi, but I've been told by people on here that's not really an issue
2. walmart pump that has both presta and schrader ends.
When you change out the tube, check the valve stem hole in the rim. Are the edges smooth and free of burs? If nor, fix this before you complete the repair. If your rims were presta and someone drilled them out for schrader, the hole could have sharp edges. And alhedges is right. Schwalbe schrader tubes are the best. bk
you might be right. I bought the bike from an old man who rides for fun. He might have gotten the hole drilled. But that shouldn't be an issue anymore, considering I just put in presta fittings that have pretty blunt edges. I also like how the stem is like a screw that you can lock into place on the rim, so the tube never slides.
My 2nd flat was due to a poor patch job, not a valve problem. I could see an air pocket collecting in the middle of the patch, where the hole was. The tube itself didn't look like it was in great shape either.
Because I hate getting flats, I want to get a thorn resistant tube - one of those thick ones. Does anyone have a good suggestion for a presta valve 27x1-1/4 tube that's well built and cheap as well?