Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great Quality

After having numerous flats on the cheap tires that came on my bike when I bought it - I replaced them with these Continentals and haven't looked back. The only negatives I'm aware of are the cost and how difficult they are to mount on my rims (Campy Zonda) - which ended up requiring demigod strength and several tire irons....