Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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You have a leak in your inner tube. You need to figure out what caused it or you may get frequent repeats.
Take out the inner tube, put some air into the tube and try to find the leak.
If the leak is on the inside circumference check your rim strip. If the rim strip doesn't completely cover ever tiny little arc of spoke hole, you'll get recurrent flats.
If the leak is on the outside circumference, check tire to be sure you don't still have a thorn or piece of wire or something stuck in the tire.
If the leak looks like two parallel slits in the side of the inner tube, whoever replaced the tube pinched a piece of it under the tire bead.