I too have one. I've got an '05 R550 and have had zero probs. I didn't even have a flat until around the 10 month mark. I've had it about 14 months and have put probably 1500 miles on it and love mine. The only thing I've changed are the tires (Specialized and they suck) and the handlebar tape. Good ride for what I do...weekends of 50+ miles and organized rides from 25-Century...let us know.