Glen

Hal, I have run 335's on the rear of my TT. 305's and 315's fit no problem. 305's and 295' are fine on the 10 btw. The VC is tolerant of the dia differences You mention also. The 315's are 25.5, the 265's(they fit on the front of ALL 993's on a 9 inch rim) are a 25.2 and the 225's are 25.1 in the MPSC. In the Hoosier the 245 and 305 will work fine but I would not run them until there is a satisfactory clarification on the issues mentioned.

993944S2

Are you guys comfortable running 235/40/18 in front
and 285/30/18 in the rear on a 993? MPSC's

Thanks;

Con

Greg Fishman

That would be a perfect set up if you couldn't run anything bigger in the back.

993944S2

Thanks Greg.. I think that is my only option.

Other than old Dunlop slicks!!!

SkipSauls

An update to the story:

The Hoosier dealer I bought the tires from, Topless Performance, called today and asked that I get the "burned in" numbers from the side of the tire, which I'm guessing is a batch number. Hoosier may replace the 285/30-18s that corded, hopefully with 275/35-18s. Apparently they are still saying that the 285/30-18s are NOT for rear-engined cars, and it may not be a batch issue so much as it is that this lower-profile tire simply can't take the extra stress of rear-engined cars.

If they do replace them, good for Hoosier for stepping up and doing the right thing. Apparently the distributors and dealers were not made aware of the potential problems with this tire/car combination, which is why some folks are having problems. If you have had problems, you might try contacting your distributor to see if they can arrange for a replacement.

Brian P

Mmm, I've got to remember that next time "Topless Performance" shows up on the credit card bill. "Honestly, sweetie, that bill was for tires." And, I have to remember not to use the phrase "mounting and balancing."

Glen

Or Rotating....

RSRRacer

Or Toe In? Well, er... maybe thats taking it too far

APKhaos

Oh sure, so what does THIS line mean?????

Service = Flipping on all four; Free for regular customers

Oddjob

They can say the tires are not for rear engined cars all they want. Sounds like a lame excuse.

The S03s worked fine on 911s. And I know of two 944s (front engined I recall) cord those 285s faster than the 911s did.

FYI, my batch numbers were 5B6W 1404.

David K.

I ran the R3S04 245/35/18 & 275/35/18 at 40 psi hot on my RS America running on Pocono's Long Course with out any problems (150 miles). I liked the tires more than the R3S03.

BTW, I did have a set of R3S03 in 285/30/18 fail last year, the inside shoulder split running them 36 psi hot.

boostid

Glen
Thanks for your suggestions. Are you saying that I can use Hoosier 245/35 fronts and 275/35/18 rears without screwing up the VC? I thought the diameters had to be closer than the 3.26% difference these have. If the 245/275 combo works, I'll probably have my dealer take back the 285/30s and replace them with 275/35s.

Update on my dealings with dealer and Hoosier;

I talked to my local dealer about the ongoing problems with the cording issues on the S04 Hoosiers. He called me today and said that the West Coast Hoosier office in Fresno told him that if you run the 285/30s on the rear, to run them at 44PSI cold!!! I can see 48-50PSI hot and a pretty greasy experience. This sounds bogus to me and not something I'd want to do.

I received an email response from Hoosier in Indiana regarding the same cording issue. They said that they are investigating the cording problem, don't have any answers yet, and will work with people to make it right.

However, they suggested the following if you are using 285/30s:

Air Pressure - 32 - 34 psi cold / 42 - 44 psi hot
(For high banked road courses, you might run 36 psi in the right front and 32-34 in the left front. The higher air pressure will help support the loaded tire)

Camber - 2.0 degrees negative front and rear if possible.
(Any amount of negative camber is good. You have to run higher air pressure if you have less than 2.0 degrees negative.)



The aboves information conflicts directly with what the west coast Hoosier office told my retailer. Retailer told by Hoosier to run 44psi cold. Tech Rep in Indiana says 32-34psi cold. That's a hell of a difference coming from two different wings of Hoosier. I'm still not going to mount these 285s and
will give this issue a few more days to play out and then if nothing is settled by Hoosier or my dealer, I'm going to ask that they replace the 285/30s with 275/35s.

Anybody else have any feedback from Hoosier?

Hal
97TT

Glen

Hal, dont run 275's on a 10, run the 305's. They will work great. What are the dia's on the3 245 choices, vs the 305?
Thx.
G
275's will fit on the front with massaging dont You dare run those skinny tires on the back of that fat butted car....lol

JW in Texas

Hal,
Glen knows He talked me into squeezing 265/305 on my '97 cup car (narrow body) & it worked fine. I would look at running the same combo on your car that way you keep the 40 mm front/rear width differential. If they fit under my narrow body, they will definitely work on your car.

boostid

Glen, Others;

The following are the diameters from the Hoosier Web Site for the S04s:

245/35/18 24.4
245/40/18 25.3
275/35/18 25.2
285/30/18 24.6
305/30/18 25.6

With my Turbo, the all wheel drive front/rear difference seems to always be an issue. You can see that the 245/35/ 285/30 combo is close, yet the 245/35 305/30 combo results in the rears being 4.9% taller. Is the VC OK with this and does it just make the all-wheel drive irrelevant? Remember that the stock 225/40 285/30 combo results in the fronts being a bit taller and allowing the all-wheel to provide some power to the fronts. With the rears taller, does the VC just go to sleep regarding the front? Or damaged? Always a question that I haven't been able to have answered. Factory/dealer always says to keep the factory diameters, but that's always their line when it comes to replacement/aftermarket parts.

By the way, Kary in his post to this thread said that a GT3 corded a 305 at Spring Mountain (Las Vegas), so I'm thinking that none of the S04 tires are immune to this problem.

Maybe I should be looking at Michelin Pilot Sports, but don't know what they have about sizes, plus they're $$.

Thanks,
Hal
97TT