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Self-sealing tubes are filled (well, not completely filled) with a sealant, similar to this used to seal tubeless tyres. When a wheel is spinning, sealant is distributed evenly around the tube, and when the puncture occurs, the sealant should be able to stop the air from leaking. They are quite reliable for small punctures (say, up to 5mmm at a time) but the ...


I had constantly the same problem with my Presta valve stems. Finally I widened the hole in the rim, inserted a rubber grommet and used a few turns of double sided hockey tape on the rim. Two years later and I never had this problem again.

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