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Road Course/Track and Autocross For road course/track and autocross discussions.

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Old 02-09-2012, 10:08 AM   #1
mstanford.us
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Best 20" tires for autocross?

I've got the knock off 20" American Racing (mad in China) torque thrust weels. Fronts are 9" wide, back are 10" wide. This year I'm running Mickey Thompson ET Street II in P305 width on the back. What I'm looking for is front tires for autocross. Michelin Pilot Sport Cup looks good, though 245 width is a little narrow for 9" wide wheels.

Anyone have any other suggestions that Pilot Sport Cups for the front?

(Stock 245 Pzeros on front are pretty worn, and weren't that great for autocross last year.) The cheapest I can find these pilot sport cups is $477 per tire.

Anyone try autocrossing with Nitto or MT drag radials in the back?

Full BMR suspension poly bushings and roll bars will go on the car very soon. Hopefully a Janetty Racing 3.91 LPE gear pumpkin with BMR diff bushings as well.

My best 1/4 mile last season was 12.5@116mph. (60' times in the 2.1 to 2.0 range :-(

Yes, I want to autocross and drag race the same car, and not have to change wheels every weekend.
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Old 02-09-2012, 10:39 PM   #2
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Bump - curious on the opinions too???
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Old 02-10-2012, 03:10 AM   #3
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I haven't ran any autocross events, all road racing events I run Toyo's R888 285/35/20
This a great tire, we are very limited on a 20in tire.
Eriq from TORQ runs these tires also, he has run several autocross events on these tires.
Best of luck....Michael
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Old 02-10-2012, 05:02 PM   #4
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you run the 285's on the front? Any clearance issues? Is your car lowered?
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Old 02-12-2012, 06:52 PM   #5
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Quote:
Originally Posted by michael's maro View Post
I haven't ran any autocross events, all road racing events I run Toyo's R888 285/35/20
This a great tire, we are very limited on a 20in tire.
Eriq from TORQ runs these tires also, he has run several autocross events on these tires.
Best of luck....Michael
http://www.tirerack.com/tires/TireSe...35&diameter=20
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Old 02-12-2012, 08:15 PM   #6
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Someone told me I would peel the drag radials off the rims trying to auto cross them. Anyone disagree with this statement, especially based on experience, VS opinion?
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Old 02-13-2012, 05:59 PM   #7
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Don't run the drag radials on an autocross course. Drag radials, by design, have a weaker sidewall to allow for flex during hard launches. Autocrossing requires very stiff sidewalls to keep the tire from "rolling over". So, although the drag radials might not "peel" off, you will damage their sidewalls using them for auto-x.

In terms of 20" autocross tires, see my sig for what I'm running. Your best bet is to run as wide a tire as possible front and rear. I'm looking into running 10.5" or even 11" rims up front for my car.

R-compound tires are hard to come by in 20". In fact, I think only the Toyo R888s are 20" R-compound.
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Old 02-15-2012, 08:52 PM   #8
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Mark,

Look at the Michelin Pilot Super Sports. They come in a huge variety of sizes, including 20 inch. From what I have been reading, they ought to be pretty decent auto-x tires. Not to mention a perfectly streetable upgrade from the p-zeros. Interestingly as well, these tires are significantly lighter than other brands in the same size. Like 4 to 5 pounds per tire.

And like I told you, I highly doubt that drag radials will pass tech inspection for auto-x.
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Old 02-15-2012, 09:48 PM   #9
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I like the Nitto NT-05's...They work well on the autocross course, 200 treadwear, so pretty good grip and work for drag racing too...
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Old 02-16-2012, 05:55 AM   #10
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I like the Nitto NT-05's...They work well on the autocross course, 200 treadwear, so pretty good grip and work for drag racing too...
Yes! NT-05s are also going to be very good auto-x tires for any of the street classes based on numerous reviews I have read.
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Old 02-16-2012, 02:48 PM   #11
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Quote:
Originally Posted by SS_Killer View Post
Mark,

Look at the Michelin Pilot Super Sports. They come in a huge variety of sizes, including 20 inch. From what I have been reading, they ought to be pretty decent auto-x tires. Not to mention a perfectly streetable upgrade from the p-zeros. Interestingly as well, these tires are significantly lighter than other brands in the same size. Like 4 to 5 pounds per tire.

And like I told you, I highly doubt that drag radials will pass tech inspection for auto-x.
I saw these on tirerack.com. Good price, and had 9.1 reviews for handling. They seemed to have higher reviews than other, more expensive tires with softer compounds. These Michelin Pilot Super Sports appear to have 300 treadwear, VS 220 for Perelli P Zeros.
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Old 02-18-2012, 12:50 AM   #12
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Quote:
Originally Posted by Avalnch View Post
terms of 20" autocross tires, see my sig for what I'm running. Your best bet is to run as wide a tire as possible front and rear. I'm looking into running 10.5" or even 11" rims up front for my car.

R-compound tires are hard to come by in 20". In fact, I think only the Toyo R888s are 20" R-compound.
Have you ever run any TLAC events in your region? If so, did they ever give you any grief for running 315 on the rears? Like you, I'm leaning towards going with 315's in the rears but I'm not sure if should stick with my original plan (using 285/35-19's). I realize some clubs may be stricter on the rules than others. I'm just trying to gather as much info before going out buying rims and tires for SCCA and NASA events that could potentially disqualify me from regional competitions.
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Old 02-18-2012, 03:28 AM   #13
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Quote:
Originally Posted by GMteSSted View Post
you run the 285's on the front? Any clearance issues? Is your car lowered?
Yes I run 285's on all 4 corners, the rims I have are Forgeline the offsets are 38mm all 4 corners.
I also have MTI Racing coil overs, there are issues with clearance, what I had to do is change out the front 10in spring to a 8in spring, even with the Phadt coil overs you have to change out the springs.
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Old 02-18-2012, 03:45 PM   #14
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Originally Posted by michael's maro View Post
Yes I run 285's on all 4 corners, the rims I have are Forgeline the offsets are 38mm all 4 corners.
I also have MTI Racing coil overs, there are issues with clearance, what I had to do is change out the front 10in spring to a 8in spring, even with the Phadt coil overs you have to change out the springs.
Are you running on 19's or 20's and what size rims did you go with?
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Old 07-02-2013, 01:55 PM   #15
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BFG Rivals seem to be the tire of chose for street tire classes now a days.
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Old 07-02-2013, 08:53 PM   #16
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Personally I have enjoyed the Nitto NT-05 and the stock Goodyear F1s on the 1LE and ZL1s. Excellent grip and sidewall strength. Michelin Pilot Super Sports are getting great reviews from those I speak with using them.
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Old 07-02-2013, 09:42 PM   #17
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I run the Michelin pilot super sports for autoxand roadcourse.. 285/35/20 all 4 corners. excellent grip. love them. if I wanted dedicated racetires.. I would go with the Toyo R888.. excellent for autox and roadcourse.
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Old 08-28-2013, 01:45 AM   #18
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Looking for more options to drive to Solo2 events. Ordered harness bar/tank plates and looking at dedicated 20x10(+35) TSWs.

Anyone know of other R-Compound options than R888 and the new NT01 in 275 or 285 20"? Running NT05s and need more steering and grip at limits.

Trying to be more competitive in SM. Everyone else is running DOT slicks on 18" & 19". Considered Rivals, but guessing it would not be that much better than NT05s.

I don't want to go smaller than 20" since I'm lowered 1" and can't get out of my driveway, let alone speed bumps with anything lower than around 28" dia. My cats sometimes scrape speed bumps or long/driveways with grade changes.

Only found one 19" option that had 27.5" DIA and didn't want to get screwed if it gets discontinued. I know I can't win class, but want to be more competitive in PAX times.

If I could fit (4) 19x10 in the car, add a tow hitch, or wife drives my truck to event and serves as pit crew, my problem would be solved. These are not options at this time.
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