Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't Do It...

Bought these to replace a set of fantastic Conti Sport Contacts 700x32 with a skinnier tire 700x23 -- bad mistake!>1 year and ~4500 miles on Sport Contacts = 1 Flat<1 month and ~350 miles on Ultra Sports = 5 FlatsSwitched to Michelin Krylion Carbons, much better tires in the 700x23 size.