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Old 06-26-2009, 01:07 PM   #1 (permalink)
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Auto-x tires

I final corded my cheap test and tune tires (Hoosier 245/35 definitely the wrong tire) and am going to step up to a Hoosier A6 295/30 or a A6 275/35.
I run A-Stock so I am wondering if anyone has had trouble getting the 295 on the 8" wheel.
Anyone run the 275, looks to be a little taller.

What pressures are you running your Hoosiers at?
I had the 245/35 at 30-32 front and 26-28 rear
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Old 06-26-2009, 04:07 PM   #2 (permalink)
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Originally Posted by GoDog View Post
I final corded my cheap test and tune tires (Hoosier 245/35 definitely the wrong tire) and am going to step up to a Hoosier A6 295/30 or a A6 275/35.
I run A-Stock so I am wondering if anyone has had trouble getting the 295 on the 8" wheel.
Anyone run the 275, looks to be a little taller.

What pressures are you running your Hoosiers at?
I had the 245/35 at 30-32 front and 26-28 rear
I started on 245s and changed to 295s when I killed the 245s. HUGE difference. I have also tried 285s. Don't waste your time, get the 295s. The 275s offer NOTHING on the LNF Kappas.

Pressures are a function of car set up and surface (concrete or asphalt) as well as preference. I get smoother I need LESS pressure. No surprise there. I like the "feel" of higher pressure, but lower pressurees deliver better times.
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Old 06-26-2009, 04:26 PM   #3 (permalink)
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I have also tried 285s. Don't waste your time, get the 295s.
You're not squeezing those 295s on the 18" X 8" stock wheels are you SoB.
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Old 06-26-2009, 07:14 PM   #4 (permalink)
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You're not squeezing those 295s on the 18" X 8" stock wheels are you SoB.
I think he is...he was trying to sell his 18 x 8 Ultraleggeras a little while ago so that he could get the 18 x 9 Allegerittas
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Old 06-26-2009, 08:38 PM   #5 (permalink)
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You're not squeezing those 295s on the 18" X 8" stock wheels are you SoB.
They slip on just like a stock tire
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Old 06-27-2009, 09:51 AM   #6 (permalink)
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Been using the 295 A6s on the 18 x 8s for 2 years. Just had set #7 mounted. They fit fine. Don't try it with the same size Kumhos tho, won't work. The only sure way to determine correct air pressure is with a probe type tire temp meter. Chalking the sidewalls is a waste of chalk and sure sign of a novice, especially with street tires. Look at the tread after running if it looks like oatmeal (not counting the OPR rubber you picked up) you are overdriving the tires. I'd suggest picking a pressure something between 30- 45 # and sticking with it, bleeding the tires to that pressure after each run until they stop changing. Playing with the pressures will just confuse you are to what is really needed (change of shock adjustment, change of driving style. The latter is usually the one that needs changing most often.) until you are running very consistant times, then make one adjustment per event and evaluate the effect it makes. It takes a very skilled and consistant driver to appreciate the difference a couple #s of air pressure change might make.
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Old 06-27-2009, 08:29 PM   #7 (permalink)
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You're not squeezing those 295s on the 18" X 8" stock wheels are you SoB.
A6 Hoosiers. No other 295s will pinch down on an 18X8" wheel. I now have 315/30X18 A6s on 18x9 OZs with no problems.
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Old 06-27-2009, 08:31 PM   #8 (permalink)
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Originally Posted by "Maine"-iac View Post
I think he is...he was trying to sell his 18 x 8 Ultraleggeras a little while ago so that he could get the 18 x 9 Allegerittas
Done, but it was for 18X9 Ultraleggeras. They are on the car now with 315s on the back and 295s on the front. VERY good.
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Old 06-29-2009, 05:24 AM   #9 (permalink)
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As a tire engineer I would not recomend putting a 315/30R18 on a 9" width rim. As I've told Bob before I think the 295 on the 9" rims would give you better performance (even though it's still 1/2" narrower then Hoosier recomended rim widths). The tire profile shape will be compromised mounting the tire on a 2" narrow rim and the chance of debeading the tire goes up.
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Old 06-29-2009, 07:03 AM   #10 (permalink)
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As a tire engineer I would not recomend putting a 315/30R18 on a 9" width rim. As I've told Bob before I think the 295 on the 9" rims would give you better performance (even though it's still 1/2" narrower then Hoosier recomended rim widths). The tire profile shape will be compromised mounting the tire on a 2" narrow rim and the chance of debeading the tire goes up.
With all respect, Alex, I spoke with Hoosier about this. They agreed that while 10 or 11 inch rims would be better, 9 inch rims would work. My logic was, and is, that 295s have been working WITHOUT issues on Kappas for three seasons on 18x8" rims on our cars. There is NOT other "DOT" tires that will do that as the Hoosiers are so pliable. The 315 is .8" wider than the 295 and is mounted on an inch wider rim. The 295s on the 18X9 rims ARE working somewhat better than the on the 8s, but at the same pressures they are show the same types of temps and wear across the faces of the tires. The rears showed identical types of wear and temps as the 295s on 8s. Pressures use this weekend were the same as I used on 295s on 8s and it worked great. The rear traction was significantly improved (tire width) while the fronts were better (better side wall support). As a point of reference I ran a Divisional this weekend at Salina, Ks., on on old municipal runway. It is clearly THE stickiest surface anybody knows of. It's like racing on Velcro. This impression of traction is backed up by data recorders and multiple Nat Solo Champs (Greg Reno, Ron Williams, Andy Hollis, Mike Johnson, etc.). If there are going to be "issues", this would be the place. Would I prefer 10 or 11 inch rims? Absolutely. For now, cash flow does not allow the luxury. Do I feel unsafe? ABSOLUTELY not. But I would NEVER attempt this on ANY other tire than a Hoosier, because nothing else will tolerate "pinching" like this, yet the A6s DO and work. Hoosiers are just a different breed of tire.
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Old 06-29-2009, 07:28 AM   #11 (permalink)
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I now have 315/30X18 A6s on 18x9 OZs with no problems.
Any rubbing issues? Especially in the back near the frame?
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Old 06-29-2009, 11:01 AM   #12 (permalink)
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Any rubbing issues? Especially in the back near the frame?
Yup, but it can easily be resolved.
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Old 06-29-2009, 12:19 PM   #13 (permalink)
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With a big hammer or...?
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Old 06-30-2009, 06:46 AM   #14 (permalink)
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And here is how the 295f/315r look under high side load. REAL hard transition, VERY high grip surface, ~36psi (MUCH lower on asphalt), well into 2nd (probably 5000 or so at about 50ish mph).
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Old 06-30-2009, 09:59 AM   #15 (permalink)
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And here is how the 295f/315r look under high side load.
No 315's up front? Did you use a spacer out back to get rid of the rubbing by any chance?
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