I have Gatorskins on all my bikes, except Panaracer Paselas on one vintage bike. I've been very happy with them usually. The front tire on my Allez, a Gator 25 has been making strange noises, the nearest I can say is a high frequency "swish ... swish ... swish" sound, speed dependent. If I ride over a painted line, like a bike lane, it goes quiet. Another bike has one of these on the rear, and I noticed several deep cuts, so I retired that tire. As I was inspecting it, if I run my finger around the circumference of the tread I feel a series of bumps, like air bubbles between the tread and inner casing. Though these tires are probably a year old (I don't track tire mileage) the tread wear holes are still plainly visible, showing estimated less than half wear. I bought three tires at the same time, and one is on the back of the Allez, and it looks, sounds and feels "normal" to touch. Years ago I had a couple of Specialized tires with tread separation, one at over 30 mph. So I'm a little concerned. Anybody else see tread "bubbles" like these? The Allez is my errand, bank, post office bike, and doesn't see a lot of miles, though I did a 44 mile club ride a couple of weeks ago with no issues. Its not something I can photograph, only hear and feel. Anybody else?