Sumitomo HTR Z5 Ultra High Performance/UHP Summer Tire for Sportscars in 225/45ZR18

Good value for a summer tire. Overall the treadwear is good. Due to the staggered tire size on my car, I cannot do a traditional rotation. Steering input is very responsive. I do have a bit more front weight than the traditional Boxster due to some mods in the back. This gives me very responsive cornering with little to no under steer. Wet traction is very good and I don't sense any hydroplaning unless the roads are extremely wet.

This is the second set of Sumitomo HTR Z5 front tires purchased for the 2007 Mustang GT and they have performed excellently. We run the Sumitomo HTR tires in the rear, just a bigger size for the staggered wheel setup. Together, these tires offer great wet and dry traction along with a responsive steering feel. These tires perform and ride just as good as they look.

Pretty good tire for occasional spirited driving.
Holds an apex very well, and won't surprise you mid turn.
Nice grip on take off, decent wet traction, does not hydroplane at reasonable speeds.
Looks fantastic. Rim saver lip adds to styling.

The honesty part of my purchase was purely economics. Not the least expensive, but close. I am a member of a car club and, well, we buy sports cars for a reason so, yeah I drive my car as such. I find the cornering traction to be above par, but the rear tires will break traction in a straight line at speed. Which I prefer because a harder tire is just a little more fun to drive. My car is rated at 455 hp and the tires let me put down good take off speed and braking. If I had more motor I would definitely look into an upgrade, but the tires seem to handle my level of “spirited” driving sufficiently. I will probably buy them again since I get about 24,000 miles out of a decent set of tires. I hope this helps.

Put these tires on the BMW Z3 as a staggered setup. The front tires 225/35/20 have completely worn down to slicks; however, the rear tires 265/40/20 have excellent tread condition. The extreme wear pattern may be contributed to front alignment needed. The tires have excellent grip in the summer and I can take corners at very high speeds without losing control. Definitely buying another pair, but I will also get an alignment.

Good looking profile, excellent traction, average tire-wear.

I had the HTZ III before these and I liked them better. They changed the sidewalls or something because the Z5 are too soft. Cornering feels lacking in response.

Great value for a slightly aggressive tire. A little noisier than I thought they might be, but not over powering. Nice grip on dry pavement take offs.

After 3 years/30k miles of mild driving, these poor tires are completely shot. I originally got them as the cheaper option on a wheel and tire package for my 2015 Mustang GT from American Muscle. Also running a premium fuel performance tune and CAI, but that shouldn't affect things too much. I had about 30k miles on the car when I got these tires (picked up a nail in the originals), so I had already stopped accelerating like an idiot, etc. I drove in a pretty sedate fashion with a lot of highway miles and local trips on county roads. I run a square setup and rotate every 5K miles. I live in Georgia, so it was generally pretty hot.

These tires are cheap, not just inexpensive. They didn't balance well. I've got more weights on the wheels (RTR Tech 5) than I like. Treadwear is ok for performance tires, but the performance absolutely didn't live up to the rating. Acceleration was terrible even under partial throttle because they'd break loose. Trying to accelerate onto a road from a side road was an adventure. They'd want to hydroplane even on humid days, and wet roads ... I don't even want to get into it. It's bad. Obviously, they're garbage in the cold since they're a summer tire.

On the bright side, they're not noisy. The ride is comfortable. They cost less than better tires. They look decent.

I think they'd be a decent summer option on a light car like an MR2 (I ran Sumitomos on mine and like them) or Civic. Something without a ton of power. They'll be totally overwhelmed by anything with horsepower. I won't ever buy these for my Mustang again.

Ran this tire for increased performance during the summer. Performed decently well at autocross events over the summer, needed a lot of air pressure due to softer sidewall. Good tire for daily driving too. Drove on this from KS to FL and back without issue. Had decent wet traction and response. Overall, for the price, this is a decent tire. For the TW rating, the wear was within expectations. However, I'd probably purchase a similar Yokohama or other brands offering in the future.

Purchased these tires for my '03 Base Boxster. I do not track this car so this review is for normal to fun road driving. Overall very good tires. Just ordered a new rear set to replace the originals with over 11k miles on them which are at the wear bars. Front tires still have plenty of tread left. Handling is very good on dry roads with normal wet performance. With the rears worn down do do start to notice some loss of traction in the wet and when accelerating through curves on the dry. Probably not the same performance as Michelin or Pirelli but for normal road driving and some fun in the twistys they work great.

Overall a great tire. I also bought these in 255 for my rears. Have good traction, even in the South FL monsoons that we occasionally get. Tread wear appears to be minimal after a year and 5,000 mi