Tires

Now that the snow is nearly gone it's time to start thinking about this season. I've been running the pirelli p zeros d3 that came with the car. I bought a couple of extra sets when i got the car. Just looked at the price of new ones and wish i'd bought more. I've been happy with the pirells' but am curious what other people have been running. If you have any input i'd be interested to hear it. Mine is a series car with 18" wheels
thanks - bruce

Hoosiers or Kuhmos depending on how long each race is for. Hoosiers Cup slicks for long or endurance races, and Kuhmos for sprint races.

Jerry

Hoosier R6s would be my first choice providing you have the frame reinforcements to support slicks (near slicks) else street tires to reduce grip and stress. Kuhmo has some DOT legal near slicks as well, but we've had great luck and durability with the R6s. If you really want max grip then the new Hoosier Radial Slicks are the fastest tire we've tested, but driving on slicks leaves little room for error near the edge of grip.

Have fun,

Kevin
GTS/GTRA
SR22

I have been VERY happy with the new Michelin racing slicks! mad grip!

Just tried a set of Michelin slicks and I am running my best lap times.

They are very reasonably priced as well.....

http://www.jdmotorsports.com/tiresales.aspx

Doug

We have tried:
Hoosier R6
Hoosier Grand Am Slicks (felt bad but might need a diff. setup to work)
Yokahama Slicks (the worst)
Michelin Slicks
Pirellis Slicks
Dunlops (only ran 17" when it was the spec from Panoz back in the day)

The Michelins and the Pirellis are the best. We run the Pirellis because they are better, have choices in compounds, and supply chain has served us better. We had issues getting tires from JD Motorsports.

IT all depends on what you are doing. The slicks are going to be stickier but once they drop off they really drop off. The DOT legal tires will slowly fad but will never be as sticky and they cost less.

Just tested the new hoosier slick and it was 2 seconds faster than any other tire I've used.

Just tested the new hoosier slick and it was 2 seconds faster than any other tire I've used.

What other tires have you tried. 2sec is alot.

We've have tested pirellis, michelins, and yokahamas. We tried the hoosier grand am tire but it didn't work to well. I got the best results with my pro driver, the other guys were just alittle better. But they all said that the new hoosier felt alot better.

We've have tested pirellis, michelins, and yokahamas. We tried the hoosier grand am tire but it didn't work to well. I got the best results with my pro driver, the other guys were just alittle better. But they all said that the new hoosier felt alot better.

Tire size help needed- I am running the p-zero 285/645/18 tires on my Wc car.
dia. 25.79"
tread 11.02"
section 11.22"


I want to run the 28.0x12.5 R18

dia. 28.0"
tread 11.02 "
section 11.22 "


The difference is
Tread plus 1.73"
Dia. plus 2.36"
section plus 2.6 "

Has anyone used this size tire and do you think they will fit with out any problems fit and function. I am not concerned about the reduced turning radius.

Tire size help needed- I am running the p-zero 285/645/18 tires on my Wc car.
dia. 25.79"
tread 11.02"
section 11.22"


I want to run the 28.0x12.5 R18

dia. 28.0"
tread 11.02 "
section 11.22 "


The difference is
Tread plus 1.73"
Dia. plus 2.36"
section plus 2.6 "

Has anyone used this size tire and do you think they will fit with out any problems fit and function. I am not concerned about the reduced turning radius.

correction to the above dimensions:

The 28..0 X 12.5 R18

Dia. 28.15"
Tread 12.75 "
section 13.87

I need helpfull input for fit. Thanks Jim

correction to the above dimensions:

The 28..0 X 12.5 R18

Dia. 28.15"
Tread 12.75 "
section 13.87

I need helpfull input for fit. Thanks Jim

Jim, have you calculated the effect that the additional diameter will have on your gearing? Other thing to think about, is do you really want a tyre with so much side wall? If you could get the extra tread width without the increased diameter that would be more ideal, especially for the front tyres.

Kel.

Jim, have you calculated the effect that the additional diameter will have on your gearing? Other thing to think about, is do you really want a tyre with so much side wall? If you could get the extra tread width without the increased diameter that would be more ideal, especially for the front tyres.

Kel.

yes and yes. Do you think they will fit under the car with out fender modifications.

yes and yes. Do you think they will fit under the car with out fender modifications.

I tried one this morning and they will not fit. The Grand Am Pirelli people were nice enough to give me one to try.It goes back today. Boo Hoo

I run the Pirelli P zero slicks, with a 285 in the front (on a 10" rim)and a 305( on a 11 inch rim) in the rear. You can stuff a 305 in the front but you will have clearnce issues at steering lock, and have to trim the fender back. In the rear the 305 measure small, but the next size 325 is to big, and does not work as well on the cars handling, with out major set up changes (different construction). Also they are built t be on a 12" rim. I have ran the Michelins, but found them to be much slower on my set up, and they cost more. They due last a little longer, but were 2 seconds slower in our test, and dont warm up as fast.
Matt

we run 305 fronts on 11 in rims - it does limit steering but we did NOT have to do any mods except steering stops and there is no effect on the track at speed.

we run 325 rears on 12 in. rims - only mod was trimming the plastic and altering the metal bracket in front of the wheel holding the bodywork by the doors.

We did not need any major setup changes. We have found after 2+ years W2W racing with both michelins and pirellis with these size tires (lots more W2W but on diff. size tires and specs) that the P-zero's are a little better but right now after a recent significant P-zero price increase they cost MUCH more than the michelins and the cost does NOT justify the minor if any perf. gain!

Racer9007 - why do you say the 325 neeeded major setup changes (diff. construction)? Also, where/what is your pricing on tires? I recently bought tires and the P-zero's where so much more we jkust switched back to michelins. We used to run Michelins but they were about the same price as P-zero so we switched to P-zero but now they are much more so back we went to Michelins.

I am not sure how long ago you ran the 325 set up, but the most recient batch out of the new Pirelli factory is very different than the old ones, they are almost 1.5 wider and are a different construction. They new ones are the tires that the Daytona Prototypes runs and are built for that application. If you want to PM I will get you pricing, and I can drop ship to you if you like.
Matt 503 819 9007