Join Date: Mar 2006
Location: Vancouver, Canada
Bikes: Rodriguez Shiftless street fixie with S&S couplers, Kuwahara tandem, Trek carbon, Dolan track
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Problems with 60mm Presta tubes
I've been using presta valve tubes for over thirty years and seldom had problems with how the steel stem was attached to the tube. Now, having started to use the longer 60mm stems, I have had consistent problems with the tubes failing (sudden leakage) right at the base of the stem. The problem will occur during rides or while the bike is parked, not while the tire being inflated.
Has anyone else experienced this? I've had this happen on no-name Taiwanese tubes with threaded stems (both secured with threaded collar and without) as well as on Conti tubes with unthreaded stems. Tubes are inflated using a floor pump with universal connector or with the big Silca presta-only head, being careful not to bend or twist the stem. Holes in rims are drilled for presta.
Any ideas? Anything I'm doing wrong? (Procedure for installing tube: inflate tube with 8 strokes of frame pump, insert into tire, install bead starting opposite stem, remove some air as bead insertion approaches stem, push in stem and pull out at final bead insertion at stem, inflate tire to standard operating pressure (120 lbs)).