logan2z

I'm just about to buy a new set of tires for my 993 and I'm on the fence about the Sumitomo HTR Z III. I've read great things about them and how they compare favorably to the PS2, but I've also read that they are prone to flat-spotting. Since I only drive my car once or twice a week, it can sit for several days in the garage. Is flat-spotting really an issue with the Sumis and, if so, should they be avoided if the car isn't driven daily?

Arena993

I have P-Zero Rosso (sp.) and as soon as they wear out it is Sumi time. I have run them on almost every P-car I have owned. Never had the flat spot issue and they sat for a few weeks at a time. Others may have different opinions or views, but a great tire at a great price.

Mike

stace

I have about 5k miles on my sumi's and have not noticed any flat spotting. I would definitely buy them again.

mike993c2s

I drive my car once a week, and I do notice a slight vibration when the tires are cold - goes away quickly after driving for a few minutes. Otherwise quite happy with the Sumis.

David993S

My 993 sometimes sits for a couple of weeks at a time (I know, I know ) Like Mike above, I will occasionally get a very slight vibration that goes away after a couple of miles - but that happens with most any brand. So I don't think Sumi's are any better/worse in that regard.

Rinty

I drive mine a few times a month, and haven't noticed any flat spotting with my Sumis.

roche

i agree with the two posts above.......if my car sits for about a week, there is a slight vibration. it typically works itself out after a mile...usually before i leave the subdivision. i never thought it was abnormal seeing how the car was sitting for at least a couple days.

NP993

A couple of times, I've been out of the country for work and my car sat in the garage for a month, even two months, at a time, and I've never had flat-spotting. Don't know where you're hearing that that's a problem.

That said, I burned through my rears in only 8K miles, as opposed to about 13K for the previous set, which were HTR Z II's. Pretty disappointed.

logan2z

I've read about the flat-spotting issue in several threads here at RL, as well as here:

http://993c4s.com/porsche-products/t...che-de-events/

LuftKuhler

I've had mine about a month and no issues. The seemed a little week the first 50 miles or so, after that they have been great. Like you, my car sits for extended periods of time, especially with all the rain here this summer. They sat for 2 weeks after installing and didn't notice much more than a little vibration when I first hit the highway, like others said, that went away. My bridgestones did the same thing

logan2z

OK, I think you guys have convinced me to try the Sumis. For the price, I don't think I can go wrong. Thanks!

Deadeye

I have apx 8K miles on my Summi's and have only good things to say about them. I have occasionally noticed a slight flat spot vibration but it quickly goes away as others have said. These tires are MUCH better than the Pirelli P-zero's they replaced, especially at auto cross events. I would estimate I should get another 5-8K miles easy on the rears at the current rate of wear.

autobonrun

I hope they don't flat spot. I have 4 sitting in my family room waiting to go on. Bridgestone S02a's priced themselves out of the market.

ljugete

I have no issues with them either and would buy them again. Great summer 993 tires for a great price at the Tire Rack!

Black993

Mine are fine. Car gets driven once a week or so. Don't let this sway you, they're a great tire.