interesting tire thread...my Rio5's tires are now at the wear mark, so i'll need to replace them...Costco currently has Michelin Premier A/S tires on sale...a set of 4 is just under $700, so call it about $850 installed/taxes in...they also have some Pilot Sport A/S 3+ tires for about $100 less, but i think i'd prefer the ride from the Premier version (plus it has a longer life).