Funny. I have real world experience on autox and road racing. I am a instructor for MSR. Yes YOU do notice a difference. Sorry if you want to DENY it.

 

Great and what was the height of the tire? Like I said, if it has over a 50 series sidewall then yes you can run them. I even said that.

 

Yea they will work. Just not recommended thats all. IMHO, I would do 17x10 all around with 275-285s on the rims. But money is always a factor so you gotta consider that too. I would do what you did if that was the case.

 

Well s***, looks like you're the expert here! My apologies!

Like I said, it's a trade off. Read in between the lines if you want, but show up to the solo nationals this year with a 350z on 235s and have fun while getting laughed at and stomped.

PS. Did you decide to read-over the part of the quantitative data that exists which negates your Godly words of wisdom?

 

FYI, I wouldn't race on these tires. I would have the size above I said in the other post all around. I wouldn't want pressure on the sidewalls at high speeds and have a blow out.

 

Uh...as it says in the post that I referenced 285/30's on 8" rims took 2nd at the 2006 nats.

 

Good for you, glad you didn't have a blow out. Ask any pro driver out there and they will tell you that your nuts to run that size on a 8 inch rim.

 

bala, how come on your website it shows you running a 17x10 then with 275 tires on them?



I also see further down on your website you show 18x8 with 275s. These don't look too bad of sidewall push. So I would put these in acceptable range for that brand of tire at least.

I thank you though for doing all your testing on different size rim and tire combos. That will help others out if they decide to switch to some race rubber. Which tires did you like the best?

 

Just to clarify: that was Thompson. I'm nowhere near that fast but when someone does well at that level with a particular setup I pay attention, as I imagine any decent racer does.

 

My car is competitive locally in FS but the really fast guy around here (Madarash) runs ESP. I thought it would be cool to just slap some more rubber on and see how close I can get to him. I intend run seriously in FS and dabble in ESP. I compared myself against a cohort of 11 drivers across an event on my 18x8's and an event on my 17x10's. The 17x10 with 275 kumho's shaved 2.1% off my times compared to the 18x8 with 275 hoosiers. So 275's on 17x10 are definitely my preferred setup as most would have probably expected from the get go. Plus they fit quite nicely without making the car any wider--great for the slaloms.

 

I still don't know where you are getting your information from.. but every prodriver I know that is competitive in BS at the national level ran 285s on 8s this year! For sure off the top of my head of people that are considered pro's: Isley (isn't he sponsored by Kumho? Why would they give him 285s to run if they knew it was going to put his life in peril? That would be bad PR for Kumho, don't you think?), Thompsons, Buckley & Hertwick.

Then there are the CS solstices doing the same at the national level. Are these people not pro level drivers and are you saying their hands on testing are at fault and that this is putting them and the autocross community in danger? If that's the case, the SEB should be written and 285s on 8s should be restricted for use in autocross.

 

Again I will ask and this is the last time. What was the height of the sidewall? If it is below 50 it is not recommended and is a safety issue. If its 50 or above then yes YOU CAN run 275-285 on a 8 inch wide rim.

I don't consider autox really a huge deal. When you get into road racing, safety is much more of a issue than with autox. Speeds are 2x-3x faster than autox would touch.

 

Last year, *all* of the 350Zs that I know of that ran in the SCCA RUNOFFS (e.g. "road racing") ran 285/30R18s on the 18x8"/18x8.5" rims that they were allowed at the time (the rules have changed for 2007, allowing for even wider rims, but not because of "safety").

Last year, Carter *almost* caught Isley at the Solo National Championships -- running on 285/30R18s.

I have a set of 285/30R18s mounted and have tested them. They are THE ticket.

I have pics from the Packwood NT and Solo Nationals showing that the *245/35R18s* could be a significant safety hazard, since the tires are flexing so much, the bare rim is left less than an inch from the pavement. Hit a bump... However, the 285/30R18s still have tire between the rim and the pavement.

You know, you almost sound like an RX-8 driver who is scared because all of the 350Z drivers are starting to "get it..."

 

lol. Good point on the tire/rim/pavement issue. Didn't even think of that.

 

http://g35driver.com/forums/showthread.php?t=132681

fyi, Eagle1 races, he is a pro. Him and many others do not recommend these sizes and there is a reason for it like I said.

 

Man, you're reaching. If you read the thread that you cited T1 vettes run 315/35R17's on 17x10 wheels which is outside the recommended range for the tire. These are people who go wheel to wheel for national championships. I don't know Eagle1, but the impression that I have is that he does hpde's and a few timeattacks. When evaluating conflicting information from different sources a distinction has to be made based on how experienced and successful that source is and T1 and T2 racers running at the Runoffs for a national championship have to be given greater consideration in that regard. Further, perhaps he is a pro but a pro to me is someone who profits from racing sufficiently enough to cover the cost of racing as well as the cost of living. Hell, I'd even be willing to accept the term if someone could just cover the cost of racing (e.g. car, tires, pads, rebuilds...)

None of the above is meant to be a knock on Eagle1. He's is probably alot faster than I am.

 

And the conclusion there?

Same as the people here (who have been doing this for a while). Wider tires are *fine* and the tire company recommendations are just that -- recommendations.

The only downsides to the 285s V710s is that they are a bear to get mounted on the 8" rims (8.5s were no real problem at all) and the price, but once mounted (and given a chance to "relax"), that they don't look pinched. The "on ground" tread width is noticeably wider than the 245s -- even on the 8" rims, and the entire tread width *is* seeing normal wear.

So, the conclusion from the people who are using the tires? 275s and 285s on 8" wide wheels are not a problem, in spite of what the lawyer-approved recommendations say.

 

And have a blow out when you push the tire hard in a corner because the bead is already pushing its limits.

Actually it IS a problem. Find one MANUFACTURE that recommends that size on a 8 inch rim. Until you do that, it is no recommended and NOT SAFE. EOD.

 

Not reaching, just stating facts. You were told in that thread as well and you are still arguing about it here.

 

Stating the opinions of others is not the same as stating fact. The fact is that T1 and T2 and solo drivers run tires out of spec and there have been no apparent reports of beads blowing. I'm still arguing because the opinions stated here and in that thread ignore that fact. I feel like I'm just repeating myself so go ahead and get the last word in and let the thread die.