Originally Posted by jimmuller

Me too. No, make that me three!

[MENTION=152773]noglider[/MENTION] mentioned air seeping out. Lately I've been doing a lot of commuting on my Veloflex tubulars. The latex tubes can drop 40psi in a day. That means maybe 15psi difference between the ride to work and the ride home. If I started the day with 110 they'd be below 100 for the ride home. Even if I'm out for just 3 or 4 hours on a day ride they'd sink between start and end.

I can feel the difference. On the ride home they feel smoother, perhaps I should say softer, but less precise. But even when pumped they feel smoother than my clinchers so extra smoothness isn't a win. I actually prefer the higher road feel anyway. My commute roads are in good shape so maybe if I rode worse roads I'd feel differently.

When commuting to my previous job I had one pinch-flat event. I was riding 25mm Gatorskins which I always pumped to their rated 120psi. One morning only 1/4 mile from the office I hit some dip, maybe a sunken gas line access cap or something. I never could be sure what I'd hit because nothing in that stretch seemed especially serious. The rear tire went flat with snakebite holes and I finished the commute on foot. Later I realized that for the last few weeks I hadn't been meticulously topping off the tires like I usually did.

Lessons learned. 1. Check the tires. 2. The lower pressure you start with the sooner it will drop to unacceptably low.