I have it on pretty solid authority that Sumitomo htr z3's are essentially Michelin pilot sports as far as grip goes with 75% of the tread life magic, for roughly half the price.
The Sumitomo HTRs are pretty good. Either the A/S P02 or the Z III. The Z IIIs are a bit sportier, and the P02s are solid all seasons with a 500 treadwear rating and a W speed rating. They also grip impressively well for a set of fairly cheap all seasons.
Currently running GTRadial Chamiro UHP1 tires and am about to install my 2nd set. They are CHEAP and almost as good at the Direzza Star Specs on my Porsche. I was shocked I got 20k miles out of them, they grip really well and don't get greasy easily at the track.
I have Sumitoma HTR ZIII's on my car and they work great for a street tire. I am surprised how long the rear tires are lasting.
I have heard good things about GT Radials... I use "Road Hugger GT Eco" (aka Kumho something or other) and they have been great. Low noise, (relatively) good grip for being low rolling resistance.
I have a set of 205's from sumitomo on my 17x9" rear. They stretched nicely, ride good and were cheap as dirt.
I bought a set of GT radial Champiro with the expectation that it will be just a crap daily driver set. They actually have really good grip for non race tires. Seriously, so much so that when I put the front set on and went to autocross, it caused my car to spin out because the front had more grip than the rear.
Tires are 235 40 18 GT Radial Champiro UHP1 Ultra-high performance summer tire ^ VERY sticky tire w/stiff side wall (nice handling and picks up lots of little pebbles - but I would not trust this tire below 40 degrees)
I had the HTR+ a few years back...wouldn't recommend it for someone who is looking for a reliable track tire or a super performance tire...but I was quite surprised how well it did for everyday driving and the occasional spirited lapse in judgement...LOL...price was very nice too
they are actually very poor tires. the sidewall is super soft an the compound is far from ideal. i ran these in maybe two autox's an they were just plain sad.
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