Sumitomo HTR Z III - 986 Forum - The Community for Porsche Boxster & Cayman Owners

chaudanova · 03-01-2010, 01:44 PM

What optimal tire pressures are you guys running with the HTRZ-III?

I've experimented with standard 29F/36R, 30F/36R, 31F/32F/33F/34F&36R setups... Not entirely sure which I like best yet, but it's quite variable for me, since I've been experimenting with different front and rear damper stiffness settings as well.

Quickurt · 03-03-2010, 02:07 PM

Quote:

Originally Posted by chaudanova

What optimal tire pressures are you guys running with the HTRZ-III?

I've experimented with standard 29F/36R, 30F/36R, 31F/32F/33F/34F&36R setups... Not entirely sure which I like best yet, but it's quite variable for me, since I've been experimenting with different front and rear damper stiffness settings as well.

The 987 has 30/37 as standard pressures. I found 28/36 gave the best wear on the PS2s, so I've set up the new Sumis the same. So far, I have no discernable wear, so as I put more miles on them I should be able to see.
These are cruising pressures.

S3adrag0n · 03-03-2010, 06:07 PM

Have Continental Sport Contact on mine and lov'n it. But want more grip on wet so I'm going with the Continental DW (rear tires getting bald). Anybody have these one their Porsche?

DamageINC123 · 03-03-2010, 06:56 PM

http://www.discount-tires-2go.com/Page.cfm?InfoID=4853

blue2000s · 03-04-2010, 08:27 AM

Quote:

Originally Posted by DamageINC123

http://www.discount-tires-2go.com/Page.cfm?InfoID=4853

HTRZIII:

Discount-tires-2go = 356 before shipping
onlinetires.com = 330 before shipping

DamageINC123 · 03-04-2010, 05:53 PM

I was looking at the Michelins. Not interested in the HTRZIII.

blue2000s · 03-14-2010, 10:49 AM

I've had the Sumis on for a couple of weeks now. Going from Continental Extremecontacts, there's a noticeable improvement in dry road grip. Steering response is maybe just a bit more crisp. Steering feel is actually improved. I notice alot more road texture through the steering. Feels like I'm on rails with the M030 suspension and dry roads.

I haven't had a chance to see what breakaway feels like. That will come when the mountain roads are a little less sandy. The Contis were very progressive and gave alot of warning.

Flatspotting really isn't any more noticeable than with the Contis. No objectionable road noise.

Ride is firm but acceptable. The tire shop noted that the stiff sidewall made the tires a challenge to mount.

So far, I'm very happy. What a great car.