Originally Posted by regomatic
The rear pinch-flatted Sunday about 20 miles out. I chalked it up to old tube in new tire
How can an old tube in a new tire cause a pinch flat? A pinch flat is normally due to a (relatively) under-inflated tire striking a pothole or some other object very hard, so that the tube folds and is smashed against the edge of the rim. (Ouch!)
Originally Posted by regomatic
Monday AM it flatted again twice before we got out of the parking lot.
Sounds as if the culprit (piece of glass? staple? nail?) was not removed from the tire casing before you repaired it the first time. Did you reference the leak's position against the tire, and find where it was compromised? Was the second flat in same location (referenced to the tire) as the first flat? I always locate the casing hole, or the offending object, as part of every flat repair.
-Greg, who has had well over a dozen flats so far in 2006, most due to glass!