lonely, looking for 15x10 companion
#21
Will it be stiffer on a 10"? Yes. Will it be faster than 9" wheel? I don't think so when talking about stock bodywork. That extra 26mm will be hanging on the outside if the car exposed to air. It's going to come down to the lessor of evils. I feel the 245 is better suited to the 9" rim on a stock body. The only way to find out is for someone to do the back to back testing.
Bob
#22
I would agree with you if this were bench racing. however the same logic was proven wrong by a large margin on past occasions with 225's. Every 225 I have tried was faster when mounted on a rim nearly an inch wider than the tire manufacturer recommended. So I won't take anybodies word on this subject based on this logic without some credible people actually trying it.
Bob
Bob
I for one look forward to seeing some actual data.
#23
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Plenty of data on every other tire out there - wider is faster.
205 NT-01 on 7 vs 8 - 8 is faster
205 R6 on 7 vs 8 - 8 is faster
225 nt-01 on 8 vs 9 - 9 is faster
225 R6/A6 on 8 vs 9 - 9 is faster
225 RS3 on 8 vs 9 - 9 is faster
IIRC CoralDoc in Florida said that a couple of the folks down there have run a 205 Hoosier R6 on a 9" wheel and said it was better than the same tire on an 8" wheel (also said that the 205/50 R6 had a wider tread patch than a 225/45 RA1, both on 8" wheels).
The definition of insanity is doing the same thing over again and expecting a different result.
205 NT-01 on 7 vs 8 - 8 is faster
205 R6 on 7 vs 8 - 8 is faster
225 nt-01 on 8 vs 9 - 9 is faster
225 R6/A6 on 8 vs 9 - 9 is faster
225 RS3 on 8 vs 9 - 9 is faster
IIRC CoralDoc in Florida said that a couple of the folks down there have run a 205 Hoosier R6 on a 9" wheel and said it was better than the same tire on an 8" wheel (also said that the 205/50 R6 had a wider tread patch than a 225/45 RA1, both on 8" wheels).
The definition of insanity is doing the same thing over again and expecting a different result.
#25
Guys keep in mind all of your examples are from DOT-R tires. We are talking about a true racing slick here with VERY stiff sidewalls. I have played with LOTS of slicks on other marques so even though I have a low post count I am not exactly a newbie.
Stay open to what I am saying and let the results speak for them self. Nothing to be gained by taking such a firm stance on the matter one way or the other.
Stay open to what I am saying and let the results speak for them self. Nothing to be gained by taking such a firm stance on the matter one way or the other.
#26
Will it be stiffer on a 10"? Yes. Will it be faster than 9" wheel? I don't think so when talking about stock bodywork. That extra 26mm will be hanging on the outside if the car exposed to air. It's going to come down to the lessor of evils. I feel the 245 is better suited to the 9" rim on a stock body. The only way to find out is for someone to do the back to back testing.
Anybody running this amount of tire and spending this much money should have already incorporated a splitter, wheel spats, and canards.
///STFU and post data if you want to continue the argument, and post an into thread or I'll have you banned
Last edited by jacob300zx; 09-14-2011 at 02:44 AM. Reason: spelling
#29
This car Im thinking of building would incorporate tubbed inner fenders and most likely drop spindles. A seriously well thought out cage integrated into a structurally lightened chassis Simi tube frame maybe move some stuff around to optimize weight distribution. I’m getting some take off tires in a couple weeks to start playing with and am sort of looking for a cheap mostly straight chassis to start hacking on.
Bob
Bob
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#32
Guys keep in mind all of your examples are from DOT-R tires. We are talking about a true racing slick here with VERY stiff sidewalls. I have played with LOTS of slicks on other marques so even though I have a low post count I am not exactly a newbie.
Stay open to what I am saying and let the results speak for them self. Nothing to be gained by taking such a firm stance on the matter one way or the other.
Stay open to what I am saying and let the results speak for them self. Nothing to be gained by taking such a firm stance on the matter one way or the other.
I have spoken with Hoosier when developing both the 9" and 10" versions of the 6UL. This goes back before the 275 existed and I was talking to Jeff Speer about a 245/40. When they decided to do a 275 instead, he contacted me because he knew I was working on a 9" wheel. I think I was the first guy to post the 275 news on a forum. Anyway, I talked to an engineer there about the 275 and whether it needed an 10.5 or 11" wheel and he said that due to its cantilevered design, the 10.5 or 11 would not give it any more support than a 10" wheel. Thus, we made a 10" wheel.
The non DoT slick isn't cantilevered though so its needs a wider wheel relative to it's tread width.
If you have ever obtain any conclusive data under controlled conditions (same car/day/driver/track/weather/setup) that shows the 245/580R15 Hoosier is faster on a 9 than a 10" wheel, I'd like to see it.
Class they're designed for is both SCCA STU and Grand Am, both limited to 8" wheels for some cars. We supply wheels to a Grand Am team running a Mini that uses a version of this tire (Conti) on an 8" 6UL.
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#33
I have customer that built a Miata something like this. His solution to the roll center problem was to sorta channel the tub and lower the body on the frame rails. Has to be a class that allows that but I think it might be the easiest way to fix that without custom spindles.
Bob
Last edited by bbundy; 09-14-2011 at 07:35 PM.
#40
I guess with all the logic being thrown around by some all the extra frontal area will make my car slow when I build a car around these bad boys.
275/35/15 DOT Hoosier versus 23.5X11R16 Hoosier Radial slicks. Not sure yet if I will use 16X10 or 16X11 wheels. They acually look good mounted on 10's
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Bob
275/35/15 DOT Hoosier versus 23.5X11R16 Hoosier Radial slicks. Not sure yet if I will use 16X10 or 16X11 wheels. They acually look good mounted on 10's
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Bob