autocross tires
Thread Starter
Burning Brakes
Joined: Apr 2005
Posts: 944
Likes: 5
From: danvers il
autocross tires
with the unavailablity of kumho tires what tires are the best to autocross and stay in street class? I have a chance at the kumho v70 for the from to run 1g but like to run street class as well can anyone help out here getting ready for next year ahead of time
Instructor
Joined: Jan 2013
Posts: 191
Likes: 11
From: Suffolk VA
Makes the $700 I spent of Geforce comp 2's look like I showed up with mini-van all-tourers.
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
Isn't SCCA going to a minimum of a 200 treadwear for the 2015 season? If you're going to run SCCA events, I would wait until the rules changes are in place, then look at tires.
What size tires are you looking for? Check out the Autocrossing and Road Racing section; you will find lots of good information there on tire brands and types.
What size tires are you looking for? Check out the Autocrossing and Road Racing section; you will find lots of good information there on tire brands and types.
Safety Car
Joined: Sep 2010
Posts: 3,752
Likes: 190
From: Indiana PA
For Corvettes I would stay away from the Rivals. They work no doubt, but I've driven a few cars with them on and I don't like them. The Hankook RS3's will my choice for next season. After two seasons on the Dunlap ZII's I like them but on a heavy car they need sparyed down after 2 or 3 runs on hot days. They don't like a LOT of heat. The RS3's do. The Rivals take heat well but its hard to get any in them when its cool out and especally on a light car like say a S2000. Drove a Subaru Legecy GT with them on it, they are ok on that car.
If you want competitive street rubber its RS3's, ZII's or Rivals. That is all anybody is running for the 200 tread wear requirements. Anything else and your getting left behind.
Tire Rack SCCA Solo Nationals are this week, look at the results and you'll see the tire brand listed for every car.
Lane Borg who is running a C5 in B Street on Hankook RS3's is the favorite to win that class. God any knows with A Street and Super Street what will happen.
If you want competitive street rubber its RS3's, ZII's or Rivals. That is all anybody is running for the 200 tread wear requirements. Anything else and your getting left behind.
Tire Rack SCCA Solo Nationals are this week, look at the results and you'll see the tire brand listed for every car.
Lane Borg who is running a C5 in B Street on Hankook RS3's is the favorite to win that class. God any knows with A Street and Super Street what will happen.
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
The Hankook RS-3 is not available in a 275/40-17 nor is the BFG Rival. Doesn't look like the Dunlop ZII's are available in that size either.
The Falken Azenis RT615K is available in a 275/40-17 and has a 200 tread wear value. The Kumho XS is availabe in that size but has a 180 treadwear rating.
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Safety Car
Joined: Sep 2010
Posts: 3,752
Likes: 190
From: Indiana PA
Biggest the Rivals, RS3's, or ZII's go is 255/40/17.
You have to go to 18" wheels to get the width back. Hence, the +/- 1 rule for SCCA Street classes.
The Falken Azenis RT615K and the Nitto NT05's are NOT competitive rubber. Your better off with the 255's than run on those.
The Kumho XS makes a great track day tire but is **** poor for auto-x takes to long to get any heat in them for auto-x use. VERY nasty in the wet/cool/damp conditions.
It really comes down to how fast you want to go? If I just wanted to putz around, anything works, if I want to be somewhat competitive then run the 255's in any of the BIG 3 that are available. I've done this for 2 years and I've been fine locally. Still not enough tire but you can have fun and go kinda fast (A LOT depends on how good a driver you are). Here some results, http://stcsolo.com/content/results/2...lts-Event6.pdf 255's work but keep in the mind the two S2000's I was chasing have 500lbs less weight and one of them wears 245's at all fours. That and they both out drove me. I was 23rd, they where 12th and 13th. Not a big raw time difference however, about .4.
If you want to build the car to the SCCA rule book then 18" wheels with 275/35/18 or similar or nothing.
