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Old 08-28-2009, 04:37 PM   #1
leecea
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Default I want to learn about slicks

I'm very confused by the different constructions, compounds, and even sizing of slicks. Google has not been much help.

Can anyone offer me a link to educational reading on slicks, especially if it is related to what works for autox?

(I'm not looking for a tire recommendation, just an education ...and I don't mean r-tires)

Thanks.
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Old 08-28-2009, 04:40 PM   #2
WRXHillClimb
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Slicks have no tread and the softer the tread compound (a.k.a. the tread wear rating, lower generally = better grip with shorter life). Wider = better. DOT approved is all you will want to get. Not much else on slicks except that toyo or Hoosier's are what you want, don't chinse & get kumho's .

A good link: http://en.wikipedia.org/wiki/Slick_tyre
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Old 08-28-2009, 04:50 PM   #3
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Quote:
Originally Posted by WRXHillClimb View Post
Slicks DOT approved is all you will want to get. Not much else on slicks except that toyo or Hoosier's are what you want, don't chinse & get kumho's .

He said he wasn't talking about R comps...
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Old 08-28-2009, 04:51 PM   #4
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manufacturers are basically Hoosier and Goodyear for usable slicks in North America for autoX. you are basically buying Formula Atlantic tyres.

if u are looking at slicks, teh concerns with your racecar that you have already overcome are vehicle weight and tyre size. if u are thinking about putting a non DOT race tyre on a subaru, it should be an on-weight car for EM/XP.

and the grip from Hoosier's r25 and goodyear st2xx compounds are why people say AutoX is the most fun you can have with your clothes on. I have been a passenger in well driven, well sorted cars. I can only imagine the ST1xx compounds would be like.
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Old 08-28-2009, 04:53 PM   #5
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To OP, the sizing of slicks is a little confusing. Take the ones we run on our RX7. 26.5X12X16. 26.5 is the overall diameter, 12 is the tread width(which can vary manufact. to manufact.), and 16 is the rim size to be mounted. IIRC, most manufacturers have different compund codes.
Hossier is like A6, R4, etc. these refer to Autocross, which are softer to heat quicker, and the R... comompund codes are road racing, which are generally a little harder, but last longer. Goodyear uses numerals of different levels to differentiate the compound. Most manufacturers have their own code.
As far as brands there are a lot out there. Hoosier, Goodyear, Avon, Kumho, many many out there. As far as the prev. poster recommending only DOT's, use what you want. DOT's are used for classes that do not allow full slicks. If they could everyone would use slicks, but many class rules for autocross, road race, etc. spec certain tire stipulations. Slicks>DOT any day for grip.
That being said, slicks generally have a stiffer sidewall, and are more prone to damage from abuse. Flat spot from braking, camber probs. Switching from DOT to slicks will require further susp. tuning to maximize the new tire. Also, if any rain pops up, slicks are no bueno. Also, costs are generally higher for slicks. But, you can find them used from used race tire dealers, race teams, many sources. We have used used slicks, treat them with tire softener, and get some more autocross and time trials for 1/3 of new tires. They don't stick as well, but 450>1300.

HTH,
Travis
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Old 08-28-2009, 04:57 PM   #6
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[quote=Boxologist;27945758]manufacturers are basically Hoosier and Goodyear for usable slicks in North America for autoX. you are basically buying Formula Atlantic tyres.

^^^ Ummm, what? Hoosier, Goodyear, Avon, Kumho, and one other I can't think of off the top of my head. And they make slicks in all kinds of makes, construction. Canitlever slicks are like 10"wide that fit on a 7" rim. The bead is "sunk" in. This is used in production racing classes a lot. Think caged MG's, Miatas, Rx7s, etc.
We run 26.5X12X16 and I am pretty sure that is not a Formula Atlantic tire. You can find slicks from 13" to 18".
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Old 08-28-2009, 06:59 PM   #7
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"slicks" is a term I reserve for true slick racing tires, not the DOT R-comp race tires. Boxologist has it right when you need to not only factor in size, but also load ratings and compounds.

Even within compounds there can be differences such as a Hoosier R25A and R25B. They are the same compound, but one has a slightly offset working temperature range. Since most "slicks" are used for road racing purposes, they have a tendency to need hotter temps before they are optimal, though you will find teams using lower temp range compounds for qualifying purposes. This temp range issue has a LOT to do with why the Prepared/Modified cars didn't do so well at HPT for nationals, and why some of them had DOT-R tires there. An A6 has a much lower temp range than most slicks (though not all) and would "come in" sooner.
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Old 08-28-2009, 11:49 PM   #8
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Andy, CP car?

If I were you I'd talk to Dave Newman on Sunday to get the skinny.
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Old 08-29-2009, 03:00 PM   #9
leecea
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Quote:
Originally Posted by waktasz View Post
Andy, CP car?
Yes, the underpowered, overweight, and basically stock CP car
(which I just determined will miss tomorrow's autox due to slight play in one wheel bearing - again)

Most likely used slicks are a bad choice, given my almost zero budget for that car and limited wheel size (16x7). I was just doing some Googling to see what's out there and it was confusing.

Last edited by leecea; 08-29-2009 at 04:55 PM.
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Old 08-29-2009, 04:52 PM   #10
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I've been having a bit more luck with Google using some of the info in this thread to get started. Thanks everyone.
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