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Old 02-15-2008, 03:53 PM   #1
BMARTIN03ZX3
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Another tire question

Is there another tire out there that is legal for sts besides the azenis that have roughly the same price and better performance or are they still pretty much the way to go.

I heard Kuhmo is coming out with a great tire but don't know what it's called.


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Old 02-15-2008, 03:56 PM   #2
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WD40 uses the Khumo SPT's for road and track duty. dont know if he is still in STS though.
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Old 02-15-2008, 04:22 PM   #3
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The new Bridgestone RE06 is supposed to be the new hot shoe.

Technically, it is not a competition tire, but claims to have the same performance.

It is legal to run in STS.
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Old 02-15-2008, 04:26 PM   #4
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Quote:
Originally Posted by scrammer View Post
WD40 uses the Khumo SPT's for road and track duty. dont know if he is still in STS though.
No...the SPTs are daily drivers.
http://www.focusfanatics.com/forum/showthread.php?t=127039
^^^Wo...something happened to the first half of my thread.
In fact, the entire 1st page with 40 posts is gone.

I use the Azenis RT-615 for AutoCross and HPDE:
http://www.focusfanatics.com/forum/showthread.php?t=124065

As far as STS legal tires:
Quote:
14.3 TIRES
Tires must meet the eligibility requirements of the Stock category
(excluding 13.3.F), with the following additional restrictions:
A. Tires may have widths up to and including 225.
B. Tires must have a minimum tread wear rating of 140.
C. Tire models must not appear on the following list, which may be
altered at any time by the SEB upon notification of the membership.
Pirelli P Zero Corsa
Bridgestone, Hankook, Falken, BFG, and Kuhmo all make good STS tires.
This is an older article, but it's still good reference material:
http://grassrootsmotorsports.com/images/samples/august_100_115_tiretest.pdf
The new Bridgestone (RE-01R) made a pretty decent showing at Nationals this year.
I don't know anyone that's been on the new Kuhmo XS yet. (don't even know if they're out yet)

Here's a quote from the SCCA forums:
Quote:
According to Rick Brennan, a 205/50-15 Kumho XS will be available as the only 15" size.
Another size that may work for the EF Civic is a 215/45-16.
I believe a 225/50-16 will also be made.
There will be many sizes available in 17s and 18s as expected.
I spoke to a chief engineer and he tells me that the Falken RT-615 was the benchmark and that their test driver is consistently faster on the Kumho.
Internally the tire has been known as the FK (Falken Killer).
The test driver has also been faster on the new Kumho over the Bridgestone RE-01R.
If you're wondering why the one of the circumferential grooves is closer to the outside, it is for better rain performance without sacrificing dry grip.
Construction and design is finalized.
Compound has yet to be finalized should be in orderly fashion to meet the April deadline.
Cannot say whether all the sizes will be immediately available but time will tell.
Prices should be similar to Falken RT-615 prices which will represent a good deal for such a fast tire.
K-Mo
Pic:
http://www.good-win-racing.com/mazda-talk/images/SEMA07b.jpg
The outer shoulder is identical to the Falken...
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Old 02-15-2008, 04:44 PM   #5
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^^

Is there a difference between the Bridgestone RE06 and the RE01-R?

Or did I completely botch the description/name of the tire?
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Old 02-15-2008, 04:49 PM   #6
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Woops....we both did...it is in fact the RE-01R
(I just looked at your post and "assumed"...and look where that got me. LOL!)
Edited earlier post.
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Old 02-15-2008, 05:18 PM   #7
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Doh !!
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Old 02-15-2008, 06:07 PM   #8
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I've seen some SCCA forum posts about the Dunlop Direzza's being a good tire (especially for wet events) - me, I'm going with a set of the 'Stones this season.

One point a local hotshoe made to me about them (having tried many different tires) is that the RE-01Rs may not be significantly faster at the absolute limit, but they are much easier to drive right up to that limit.

I'll report back how I like them.

Edit - there's also the new Toyo Proxes R1Rs coming out, but that's another unknown quantity.
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Old 02-16-2008, 04:25 AM   #9
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has any one used the pzero nero street tires? might try those after i wear out the kumho's
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Old 02-16-2008, 07:04 AM   #10
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Quote:
Originally Posted by BMARTIN03ZX3 View Post
Is there another tire out there that is legal for sts besides the azenis that have roughly the same price and better performance or are they still pretty much the way to go.

I heard Kuhmo is coming out with a great tire but don't know what it's called.
As of today, there are three tires on the market that have Focus friendly sizing and are considered the best for the street tire classes (STS, STX, STU, STS2). They are...

Falken Azenis RT-615
A great tire for the money.
215/45-17 go for $108. (EdgeRacing.com)
Stiff side wall and good turn in qualities.
The 615's tend to lose maximum grip as they wear. (As much as 15%).
They are more susceptible to heat and will reach their limits and become greasy after a few runs on a hot day. (Spray down the front tires with a water bottle to handle this problem).
If your going to drive these on the street as a daily driver, they are ok in the rain at full tread depth and go downhill from there as they wear.

Bridgestone Potenza RE-01R
More expensive than the 615 at $161 for a 215/45-17. (TireRack.com)
Overall, considered to be a better tire than the 615.
The softer sidewall doesn't do much for turn in but once set, the 01R does have a little more maximum grip than the 615 once some heat has built up.
They are also more resistant to heat buildup but when they do give away, its not as smooth as the 615.
New driver's seem to have an easier time being fast on the 01R vs. 615.
Wet performance is also better than the 615.
The 01R does not lose grip as it wears.

Dunlop Direzza Sport Z1
Pricing is more in line with the RT-615. A 215/45-17 cost $117. (TireRack.com)
Released late last year, the Z1 missed Nationals. Early reports indicate the following:
Very stiff side wall comparable to the 615.
Maximum grip equals the 01R.
Resistance to heat exceeds both the 615 and the 01R.
The Z1 does not lose grip as it wears.

I love the RT-615 and I'm currently on my 3rd set. However, considering the favorable early reporting and the reasonable pricing, I think I'm going to try out the Dunlop Z1's this year.
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