Half way through my ride today, I hear that pssssssssssssssssseeeeeew as the air escapes from my rear tire. A little annoyed, a pulled over and went about changing to my spare tube. I am very careful to brace the head of my pump against something solid (in this case, a curb) so that the pump and valve are held very steady with no strain on the area where the valve attaches to the tube.
Care or not, half way to acceptable pressure, the valve stem lets go.
I only had one spare along today, so, now I'm out of business.
Had to phone the house for the Mrs. to come out and fetch me.
Instead of burning 30 miles worth of calories, we through the bike on the rack, went to a nice restaurant, and had a nice brunch together.
I suppose I can't blame my tires for the valve-stem failure, but, I think I may have to say goodbye to these Schwalbe Stelvios. I am having just too many flats.
There was no puncture in the tube or tire - I'm guessing that the tube worked its way through a previous puncture hole that I had patched from the inside using a stick on patch. The surface of that patch was broken, so, I'm guessing that pressure on the tube forced tube material into the tire opening and eventually caused it to fail.
I have had more flats in the year since mounting these Stelvios than what I experienced in three years using Armadillos.
The Stelvios are more fun to ride, but not when the flat every other week.
These Selvios are supposed to be puncture resistant - but I cannot say I've had great luck with them - and the punctures I have experienced went right through the Kevlar band.
Ok, I'll stop whining, now.