My rear road bike tire keeps going flat after the bike is idle and not being used for several days. I road non-stop for weeks and then went away for business. I came home and the tire was flat. There is a puncture so it's not like the air is gradually escaping. I have no idea how or why these punctures are happening but it happens constantly.
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i had 2 very strange porblems recenlty: first, i kept getting punctures (flats) nearly every ride. 20mph for 20 moles or so...pretty hard. after getting 3-4 in 2 weeks, i finally went to a bike swhop and the guy said it was likely from a tiny piece of the wire taht is inside the tire to maintain it's shape. *holes were always in the same spot*. cahged the tire and problem gone!!!
rim tape could be another area that needs to be addressed. simply run your fingers along the tape to see if there are nay sharp points (tissue pater also works well as it will tear upon contacting a snag).
First question: have you actually repaired the flat? First you talk about a puncture, then you talk about punctures in the plural. If you have replaced the inner tube and the tire is still going flat, did you check the tire for whatever foreign object caused the flat? If you didn't, it could still be there, and as soon as you ride again, it will puncture the new tube and cause another flat. If you haven't replaced the tube, the puncture is still there even if the tire holds air for a number of hours, it won't go away by itself, you have to fix it.
"There is a puncture..."
Well, have you patched the tube? or do you just fill the tire with thicker air?
Pull the tire off the rim and inspect the inner side for the possible presence of sharp debris. Inspect the condition of the rim tape. Your wheel does have rim tape, right? Good. If the tape's in poor condtion, replace it. Good tape should last the life of the wheel, but who knows what they're doing nowadays. Now put on a new tube of good quality. Some are worse than others. Remount. Inflate prior to every ride, and always inflate to the proper pressure; low pressure causes pinch flats.
If you use a decent tube, good tire, and watch where you ride, there's no reason to suffer constant flatting.
These guys have got it right! But it's known, a tube will lose air, especially if it's a road tire, (80+lbs.) after a month or so. I always check B4 a long trip.
if you check the tire and still cant find a hole check to see if your valve stem is tight