Tires (actually GP4000 Reflex, not S) were purchased from probikekit.com in Spring of 2010. Rode for one year. My bike with these tires was then stolen in Spring of 2011 out of my garage. Turns out the local police department found my bike the night it was stolen, but didn't bother contacting me until one year later (just before the police auction go figure). So the tires sat in a police warehouse for an entire year until I got my bike back in Spring of 2012. Then tires ridden occasionally since then.