J Stewart

I am looking at this tire for a dual purpose street/DE tire - Actually more of a DE tire I can drive to and from the track. I realize there are comprimises with this sort of tire (noise, wear, stick vs a full race tire, etc..) - but has anybody used these for street/track and what do you think??
Tirerack reviews have too many non P-cars for me to be relevant.

Viken

This is not a bad dual-purpose tire but many people favor the Kumho V700 Victoracer and the newer Ecsta V700. These seem to stick better and last longer.

<a href="http://www.tirerack.com/tires/kumho/ku_v700.jsp" target="_blank">V700 Victoracer</a>

<a href="http://www.tirerack.com/tires/kumho/ku_ecsta_v700.jsp" target="_blank">ECSTA V700</a>

Will

Also, the Yokohamas aren't available in 18" sizes.

Will

Greg Fishman

A new tire (well actually new sizes) to look at is the Toyo RA-1. This is a very long lasting R compound that actually gets faster the more worn in they are. I haven't run them before but once the 18's are available (they may be now I haven't checked in a month or so) I will get some to use as rain tires.
I rode with a friend in a Corvette this weekend and he has the new Kumhos and they seem to really stick well.
Either choice would be good. The Yok's don't seem to be as good of a tire as either of these choices.
Greg

Ray Calvo

[quote]Also, the Yokohamas aren't available in 18" sizes.<hr></blockquote>

They're apparently not available in good range of 17" either - same with the ECSTA V700. Couldn't find either in a 225/45X17 for 993 fronts; think the ECSTA aren't avail. in 255/40X 17 for rear either. I ordered a set of V700 Victoracers; will try them in mid-April at first track event. Will see what happens if it rains to or from the track, as well as on the track.

J Stewart

Ray - the closest sizes to my OEM front sizes (205/50 17) is 235/40 and for the Khumo V700 ECSTA - the sizes will be 225/45 17 and 275/40 17 - will these fit on stock 993 Cup Wheels?

KC993

J Stewart,

The 235/40/17 is only 24.40, you want to use 235/45/17 which is 25.326 to go with the 275/40/17 which is 25.661.
I currently have 245/45/17 on 7x17 F, and 275/40/17 on 9x17 R cup wheels.
Someone asked me before on whether the turning diameter is larger or greater with these sizes of tires. The answer is NO. They are the same as my street 18", as I just came back from AX school.

E. J. - 993 Alumni

[quote]Originally posted by J Stewart:
<strong> the sizes will be 225/45 17 and 275/40 17 - will these fit on stock 993 Cup Wheels?</strong><hr></blockquote>

That is the size I run Hoosiers at the track.

E. J.

tom_993

E.J.,
Check out this chart of BFG KD’s. Note that the 275/40’s show 811 Rev’s per mile, while the 255/40’s show 831. Do you notice any gearing change due to this difference? The lower RPM’s should put you a bit higher in the rev range for a given speed, if I’m not mistaken.

I’ve got the 225/45’s on the front and the 255/40’s on the back. Perhaps I’ll bump up the rears next time I need new ones (which is SOON!).

Tom

<a href="http://www.tirerack.com/tires/Spec.jsp?make=BFGoodrich&model=g-Force+T%2FA+KD" target="_blank">Tire Rack's Specs for BFG KD's</a>

DJF1

Folks,

I was on a "DE" run in France from the Brettagne Porsche club of France this past weekend. The tire of choice seemed besides Dunlop slicks the Pirelli P-Zero C which is similar I guess to the Kumhos etc.
Nowhere to be found any other brand...
Only a 993S4 was shod with a Falken tyre which I had never seen before, otherwise Pirelli's galore from the normal assymetricos to the C.
Do they know something we dont???

Unfortunately with my very broken French the only thing I could find out is that they are really good on the track and cost 200 Francs per KM... in other words wear very fast.
Anyone has any experience with these tyres???
I for one have been very pleased with the normal Assymetricos on the track.

<img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

Ray Calvo

[quote]Ray - the closest sizes to my OEM front sizes (205/50 17) is 235/40 and for the Khumo V700 ECSTA - the sizes will be 225/45 17 and 275/40 17 - will these fit on stock 993 Cup Wheels? <hr></blockquote>

Go to the Tire Rack site and check it out for yourself vs. your wheel widths. The 225/45 balloon slightly on my 7.5" fronts; I did not want to go any larger than 255/40 in the rear on my 9" Mille Miglias due to having had problems with tire rubbing at times on some previous tires (can't remember details).

E. J. - 993 Alumni

[quote]Originally posted by tom_993:
<strong>E.J.,
Check out this chart of BFG KD’s. Note that the 275/40’s show 811 Rev’s per mile, while the 255/40’s show 831. Do you notice any gearing change due to this difference? The lower RPM’s should put you a bit higher in the rev range for a given speed, if I’m not mistaken.]</strong><hr></blockquote>

Tom, If what you say is true, I have never noticed it. It feels perfectly normal at all speeds. I think if I were to 'try' and find something as you describe while at the track at speed, it might be too much OT stuff at the time if you know what I mean .

Never noticed it and the car is VERY neutral with those size tires. Remember that this is only Hoosiers at the track though.

E. J.

tom_993

[quote]Originally posted by E. J.:
<strong>

Tom, If what you say is true, I have never noticed it. It feels perfectly normal at all speeds. I think if I were to 'try' and find something as you describe while at the track at speed, it might be too much OT stuff at the time if you know what I mean .

Never noticed it and the car is VERY neutral with those size tires. Remember that this is only Hoosiers at the track though.

E. J.</strong><hr></blockquote>

E.J., A tire diameter change does cause a gearing change. I guess the ~2.5% change (about 150 revs at 5,000) is not noticeable. Thanks!

Ray, I have 225/45/17 on my 7” cup wheels, and they don’t seem to balloon. I wonder what the difference is? I have BFG KD’s. The spec sheet from Tire Rack specifies 7” as the minimum width for these. It also specifies 9” as the minimum width for 275/40/17’s.

Tom

Greg Fishman

Tom,
When I went to a larger size rear tire 285 to 305 in Hoosier. I could definitely tell a gearing change. There were places at Mid Ohio that I would hit the rev limiter before the brake zone and with the 305 I was several hundred rpms shy of the rev limiter. The rolling radius is 77.3" for the 285/30 and 80.4" for the 305/30.
Race team do take this measurement into account when they look at their setup.
Greg

Martin S.

The A032R is an interim tire, and will be replaced in the near future by the A048R, or so I have heard. I know of one Rennlister who uses the A032R as a dual purpose tire...in fact he beat my old track record at the Streets of Willow by 1 full second, Jason C, sob, choke!!!

With a tread wear rating of 50, dual purpose tires tend to go away fairly quickly. The down side of a dual purpoise tire..if you eat one up, how do you get home?

I suggest begging a ride to the track with one of your pals with a trailer. You may have to buy him/her a tank of gas, or...but it will be worth it peace of mind wise to have a dedicated set of track wheels and tires.

Or you could get one of those little trailers and take your race tires to the track that way. I have heard that a hitch for the 993 is now available.

For the price, assunming you are running 17" wheels, the Kumho Victoracer V700s are hard to beat. If you are on 18" wheels, you'll need to go to the ECSTA V700, the latest from Kumho, and according to Kumho, this tire is a little stickier...it wont last quite as long.

Good luck,

Martin