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Old 08-14-2009, 09:32 PM   #1
Roel03
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Default Tire size

I'm getting 17x8 5zigen fno1rc and i wanted to know what tire size i should be running. I do autox my car once a month and wanted to know which would be the ideal width. Thanks
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Old 08-15-2009, 12:14 AM   #2
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Ideally for autoX you would get the widest tire that you could fit on the rim. For a 17x8 rim with street tires I'd go with the Bridgestone RE-11's in a 255/40R17.
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Old 08-15-2009, 10:17 AM   #3
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Quote:
Originally Posted by Roel03 View Post
i wanted to know what tire size i should be running.
The widest and stickiest tire allowed by your class rules.

Quote:
Originally Posted by Roel03 View Post
I do autox my car once a month and wanted to know which would be the ideal width. Thanks
The widest and stickiest tire allowed by your class rules that you can afford and fit on the car without rubbing (badly).
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Old 08-15-2009, 11:55 AM   #4
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ok thanks guys. i really appreciate your input
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Old 08-15-2009, 12:23 PM   #5
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Quote:
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ok thanks guys. i really appreciate your input
i guess if you want to avoid rubbing use lower profile if your allowed.. i am running 245 / 35 /18 on 18's and i dont have any rubbing issues, before i had the 40 profile and in hard cornering it used to
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Old 08-15-2009, 06:08 PM   #6
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I have 17x8 rpf1 and running 245/40 on stock 04 sti suspension and have no rubbing and I think it's perfect. I think if you want 255 you may have to roll your rear fenders
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Old 08-15-2009, 06:14 PM   #7
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i guess if you want to avoid rubbing use lower profile if your allowed.. i am running 245 / 35 /18 on 18's and i dont have any rubbing issues, before i had the 40 profile and in hard cornering it used to
your situation doesn't really apply. 245/40/18 is much taller than 245/40/17, which is nearly the same as the oem 225/45/17.
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Old 08-15-2009, 07:23 PM   #8
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I'm running RE-11's and getting rubbing issues, but i'm on 17x7 rims 225/45R17. I know a lot of people running these tires (cuz i work for bridgestone) and in the larger sizes they are not having the same issue as me. So I would recommend them in that size.

Its about time for me to sell all my cars.
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Old 08-16-2009, 07:55 PM   #9
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I'm running RE-11's and getting rubbing issues, but i'm on 17x7 rims 225/45R17. I know a lot of people running these tires (cuz i work for bridgestone) and in the larger sizes they are not having the same issue as me. So I would recommend them in that size.

Its about time for me to sell all my cars.
You need a better alignment if you are rubbing with 225/45-17's.
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Old 08-16-2009, 08:28 PM   #10
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Originally Posted by recnelis View Post
The widest and stickiest tire allowed by your class rules.



The widest and stickiest tire allowed by your class rules that you can afford and fit on the car without rubbing (badly).
The widest tires are not always the best. If you have tires that are too wide, they can lower performance.
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Old 08-16-2009, 08:31 PM   #11
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^^^^This is the autocross section. Most every Subaru running today is heavy enough to heat up all but the most extremely wide tires out there.

Jay
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Old 08-16-2009, 08:53 PM   #12
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I have heard that I can run 255's or even 275's on the OEM rims is this true?

Quote:
This is the autocross section. Most every Subaru running today is heavy enough to heat up all but the most extremely wide tires out there.
What do you mean by this?

What DOT race tires do you think is best for autocrossing?
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Old 08-16-2009, 09:11 PM   #13
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You need a better alignment if you are rubbing with 225/45-17's.
I have a good alignment. the backs are OK. I'm running 1/8th degree toe out front, 0 back

I've increased front camber from 0 to -6 gradually over the past few AutoX's and they are still rubbing.



this is with -6 camber. 225/45R17 RE-11's. 40psi in the front (i've gradually increased from 30 weekend to weekend)
I'm not willing to go any farther since I'm already at twice the typical camber regime. I have reduced the amount of rubbing, its not making it all the way down to the turn-up anymore.

Last edited by Dirty25RS; 08-16-2009 at 09:16 PM.
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Old 08-16-2009, 10:02 PM   #14
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My car is lowered on coilovers so i dont think I will go to 255 because I don't want to worry about any rubbing issues.
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Old 08-16-2009, 10:18 PM   #15
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Quote:
Originally Posted by Dirty25RS View Post
I have a good alignment. the backs are OK. I'm running 1/8th degree toe out front, 0 back

I've increased front camber from 0 to -6 gradually over the past few AutoX's and they are still rubbing.

this is with -6 camber. 225/45R17 RE-11's. 40psi in the front (i've gradually increased from 30 weekend to weekend)
I'm not willing to go any farther since I'm already at twice the typical camber regime. I have reduced the amount of rubbing, its not making it all the way down to the turn-up anymore.
-6 degree of camber??? Wow, that's alot. what camber plates you have that can get -6 camber?
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Old 08-16-2009, 11:34 PM   #16
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Quote:
Originally Posted by Dirty25RS View Post
I have a good alignment. the backs are OK. I'm running 1/8th degree toe out front, 0 back

I've increased front camber from 0 to -6 gradually over the past few AutoX's and they are still rubbing.
If you have -6 degrees of camber, you do not have a good alignment. That is way too much.

I have setup WRX's with 245/40-17's and have not had rubbing issues, if you are running a 20mm thinner tire, you should be able to get your setup to not rub without any issues.
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Old 08-17-2009, 07:13 AM   #17
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What do you mean by this?

What DOT race tires do you think is best for autocrossing?
In autocross, the most rubber on the track is almost always the best way to go. There's no concern with rolling resistance, aerodynamic drag or anything like that. Subarus are heavy, you can get heat into some big-big tires....especially if you have a codriver helping out. IIRC, it's not until you're looking at 300+ series tires that you have to be concerned about not getting heat into them. Lower if your car is lighter. We have no problem heating up 275's in an FSP car weighing 2450lbs......that should tell you something when you're driving a car that's 2900+ lbs.

Oh, and the best autocross tire out there right now is the Hoosier A6. They don't last too long, but good lord...... the grip is just amazing. Downright Addictive......mmmmmm!

Jay
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Old 08-17-2009, 07:46 AM   #18
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Originally Posted by speedyHAM View Post
If you have -6 degrees of camber, you do not have a good alignment. That is way too much.

I have setup WRX's with 245/40-17's and have not had rubbing issues, if you are running a 20mm thinner tire, you should be able to get your setup to not rub without any issues.

I guess I'll have to repeat. I've gradually increased weekend to weekend from 0 to -6. I know its too much but the rubbing decreased as I got closer to -6. -1 on the bolt (maybe just -0.9), -5 on the plates.

And i listed my other alignment settings, which are good. And are still accurate.

But this isn't my thread so Im done discussing my rubbing issue.
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Old 08-18-2009, 12:59 PM   #19
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deleted (but I still would like to see a head on shot with 6 degrees of camber)


275 can fit on stock bbs's, but they will rub. People do it fairly often in AS class

Last edited by xcdhridr; 08-18-2009 at 02:15 PM.
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Old 08-27-2009, 01:00 AM   #20
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dont make the mistake of gettin the widest tires, they wont improve performance
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Old 08-27-2009, 06:36 AM   #21
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dont make the mistake of gettin the widest tires, they wont improve performance
We've got results to prove otherwise.....

Jay Storm
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Old 08-29-2009, 09:36 PM   #22
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The widest, stickiest tires that will fit on your rim and under your fenders is definitely the way to go for AX. Since you will be driving the car on the street as well, you will likely choose to compromise on the AX performance to get a decent daily driving experience (no rubbing and no r-comps).
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Old 08-31-2009, 03:55 PM   #23
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My car is lowered on coilovers so i dont think I will go to 255 because I don't want to worry about any rubbing issues.
What other mods do you have? Are you trying for a specific class?
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Old 09-03-2009, 11:50 AM   #24
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I have a wrx with a vf39 and sti topmount, with a turboback. I just started in autocross so I am not really competetive. I want to incerease my driving first then start to get more competetive.
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Old 09-03-2009, 08:03 PM   #25
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Then get some really good extreme performance street tires. Something like the Dunlop Direzza Star Spec or Kumho XS. Those tires are quite forgiving and give great feedback as you approach the limits of traction, which makes driving and IMPROVING your driving far easier. I would avoid r-comps until you get a better feel for the ways traction works, and until you get used to autocrossing.
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