Duralite had replied to my email by noon on Monday. They were super. I had explained that I needed them desperately for this weekends Monster Madness race and they immediately send replacements via 3-day select shipping at no cost! I was able to send them photos and even a short video clip showing the slight puffing and they didn't want to mess around, they just want to replace them...amazing customer service...My other pair of TrackPower's are still running great. Great product and great service, perfect combination!