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Old 12-20-2005, 08:54 PM   #1
mx_9
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Default AutoX tire width input needed: 04 STi with 7.5" rims

I've searched through various sites looking for info regarding tire sizing on the stock 7.5" rim but what I mostly found was info regarding what tire sizes look good versus what can be used in competition. I'm considering Advan A032R's in soft compound for this coming autoX season and would like to go with their 245/45/17s. However, the Tirerack web site shows the minimum rim width to be 8.0". Yet, Falken shows a minimum of 7.5" for their rt-615s. So, it seems like 245's are 'doable' but not recommended by Yoko for the 245/45s. I understand the issue of bulge and potential loss of sidewall strength if using 245's on a 7.5" rim, but is the added tread width worth the tradeoffs? I am far from smooth, so does the potential to break a bead increase with far-from-smooth transitions? Any input would be appreciated.

I will also be buying a set of RT-615's as daily drivers so it will be interesting to compare the two tires (I'll get them in the same size).

I will be running in SM due to: a) ECUTEK and TBE, and b) no one is running locally in BSP.
04 STi
Front camber: -1.4
Rear Camber: -1.8
JDM pinks

Thanks, Chris
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Old 12-21-2005, 12:25 AM   #2
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I ran 245-45-17 v710's on my stock BBS's. They fit the wheel fine. If your going to run the yok's I think the 245-40-17 would be better. My 245-45's fit but do rub the front inner fenders.

James
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Old 12-21-2005, 10:18 AM   #3
ratt_finkel
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Don't waste your time on the Yok's. If you're worried about longevity. Go with some Victoracers, they should last you more than a season are much sticker and cheaper than the Yoks.
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Old 12-21-2005, 11:59 AM   #4
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And get some camber bolts from Dale - I'll help you install them. You NEED more camber in front.
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Old 12-21-2005, 12:05 PM   #5
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Quote:
Originally Posted by ratt_finkel
Don't waste your time on the Yok's. If you're worried about longevity. Go with some Victoracers, they should last you more than a season are much sticker and cheaper than the Yoks.

not sure about lasting more than a season? my victoracers dropped off about halfway through the season, corded about 3/4 of the way through.. i guess it depends on how many events you run..

but i agree, i'd take the victoracers any day of the yoks.

i also saw a huge improvement in tire wear once i installed the strano bar.. an added benefit besides the improved handling.
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Old 12-21-2005, 12:27 PM   #6
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I know of a STU STI driver that won a National Solo2 event using 245/45/17 Azenis's on stock 7.5" wheels ... so that've quite do-able ... but you REALLY should get some relatively inexpensive 8.5" Rota Slipstreams. To bad I just sold my two sets.
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Old 12-21-2005, 12:32 PM   #7
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Quote:
Originally Posted by Fred
And get some camber bolts from Dale - I'll help you install them. You NEED more camber in front.
Wouldn't more camber increase the likelihood of rubbing on the inside of the tire? I'm just hoping to get 245's on there without any type of rub. Front or back. What size tires are you running on your 04 this year?
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Old 12-21-2005, 01:22 PM   #8
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Yokos run wide, so get the 235. The 245 Yoko is too wide for an 8" wheel

Obligatory Hankook > *.* comment

-Tom
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Old 12-21-2005, 01:28 PM   #9
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well i don't see why the 245 wouldn't be do able as i run a 245/45/16 on the stock wrx wheels. granted i do put a 1/4 inch spacer to accomodate them
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Old 12-21-2005, 04:38 PM   #10
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I'll be running the 225/45/17 RE070's until they're gone (shouldn't take much more than the 2nd annual 240SX vs. WRX driftoff at the Test & Tune ), then the 225/45/17 RT-615's that are currently in use for daily driving.

I'm not fast enough to get 100% from 225's, so 245's would be a waste of money.
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Old 12-21-2005, 05:24 PM   #11
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Quote:
Originally Posted by mx_9
Wouldn't more camber increase the likelihood of rubbing on the inside of the tire? I'm just hoping to get 245's on there without any type of rub. Front or back. What size tires are you running on your 04 this year?
There are several guys I know that have run 245s with 3+ degrees negative camber in front without any rubbing issues so the 2.5 degrees or so you will get with camber bolts should be fine.
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Old 12-21-2005, 06:19 PM   #12
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i'm running 255/40-17 Pirelli Corsas on 17x8 Rotas on my '04 STi. Zero rubbage. I have Tein Flex 10/8 setup, 13.75" ride height. Plenty of room in the back. I only rub a little on the left front fender liner when I come off the last turn at Thunderhill and nip the curb. And i think that fender liner is a little out of place from when i rubbed it during my 275/40-17 Hoosier days.

static photo:



Chris H.
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Old 12-21-2005, 09:44 PM   #13
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Quote:
Originally Posted by Fred
I'm not fast enough to get 100% from 225's, so 245's would be a waste of money.
Kevin..thanks for taking the wind out of my sails! I'm not fast enough to get 100% out of 155/70/17's but plan on getting more rubber anyway. I think your speeds in the STI will have you wanting more lateral grip with the way you'll be entering elements at mach-2.
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Old 12-22-2005, 08:05 AM   #14
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Hey, if I wanted grip I'd get R compounds, not switch to barely wider street tires. I'm looking forward to autoxing the STi this year not because of how fast I can go in it, but because of how much fun I can have going fast sideways.
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Old 12-22-2005, 11:01 AM   #15
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Quote:
Originally Posted by Fred
Hey, if I wanted grip I'd get R compounds, not switch to barely wider street tires. I'm looking forward to autoxing the STi this year not because of how fast I can go in it, but because of how much fun I can have going fast sideways.
I hear ya on the sideways thing... then again, at our driver meetings each race, they make it a point to announce "This is not a drifting event..." boooo!
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Old 12-22-2005, 01:45 PM   #16
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We have a guy in our club named Randy Melton - has a Mustang that he runs in ESP. Used to have a V8 Pinto that sometimes ran FTD. Great - and I mean GREAT! - driver. Year before last, he would bring the Mustang out on bald street tires and drift the entire course from start to finish, and even last year on 315 V710's he would sometimes spin through the finish if it was safe to do so and then do a couple of donuts afterward. Highly entertaining, but the officers had to ask him to tone it down because he was "setting a bad example for the novices."
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Old 12-22-2005, 07:11 PM   #17
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Quote:
Originally Posted by ratt_finkel
Don't waste your time on the Yok's. If you're worried about longevity. Go with some Victoracers, they should last you more than a season are much sticker and cheaper than the Yoks.
Sure the Yok's dont have the grip of the Vic's, but as far as longevity, the Yok's will SIGNIFICANTLY outlast the Vic's. So if he's looking for longevity, the yok's are the way to go.
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Old 12-22-2005, 07:42 PM   #18
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Quote:
Originally Posted by solo2wrx
There are several guys I know that have run 245s with 3+ degrees negative camber in front without any rubbing issues so the 2.5 degrees or so you will get with camber bolts should be fine.
Most people with -3 degrees of camber are getting it with camber plates, those dont affect strut to tire clearance. Doing it through the camber bolt puts the tire closer to the strut which could lead to rubbing issues.
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Old 12-22-2005, 07:42 PM   #19
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Quote:
Originally Posted by REX8
Sure the Yok's dont have the grip of the Vic's, but as far as longevity, the Yok's will SIGNIFICANTLY outlast the Vic's. So if he's looking for longevity, the yok's are the way to go.
I'm actually just looking for a 'better' tire for AutoX that can be used on 7.5" rims without any kind of modification to make it work. I kind of settled in on the A032Rs since they *can* be driven to events if desired. Plus, GRM August edition, had some good things to say about them with respect to first-timers on R-comps. That's me It's now simply a matter of do I try to stay close to stock size or do I/can I upsize without rubbing.
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Old 12-22-2005, 07:51 PM   #20
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Quote:
Originally Posted by mx_9
I'm actually just looking for a 'better' tire for AutoX that can be used on 7.5" rims without any kind of modification to make it work. I kind of settled in on the A032Rs since they *can* be driven to events if desired. Plus, GRM August edition, had some good things to say about them with respect to first-timers on R-comps. That's me It's now simply a matter of do I try to stay close to stock size or do I/can I upsize without rubbing.
In your case, I like the Yok's. Since you're autoxing for fun, long lasting tires, that are great in the rain, that can be run on the street seem like a good fit for you. No one is going to recommend the "slower tire", well maybe no one except me. Don't rule out the "H" compound either. You're car is heavy, so if you plan on doing any track days (which you REALLY need to try), your tires will last forever.
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Old 12-22-2005, 08:10 PM   #21
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I appreciate the input...Thanks. What I meant by 'better' was that I am considering something other than the RE070s that I've been using and it's my understanding that I'll have to go wider to get something that is stickier than them. Pure race tires like Hoosiers are not an option at this point.
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Old 12-23-2005, 11:09 AM   #22
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A032R's will heat-cycle to death before they run out of tread, but they'll last a fair bit longer than Victoracers.

Toyo RA-1's are about 1/2 way between the two. A little faster than the Yok but wears a little faster. The Toyos keep getting faster until they cord.
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Old 12-23-2005, 11:32 AM   #23
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You can drive the Victoracers on the street as well. I still say the Yoks are a waste of money. Sure the tread lasts a long time, but any usable performance will be long gone before that.
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Old 12-23-2005, 12:21 PM   #24
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Quote:
Originally Posted by mx_9
I appreciate the input...Thanks. What I meant by 'better' was that I am considering something other than the RE070s that I've been using and it's my understanding that I'll have to go wider to get something that is stickier than them. Pure race tires like Hoosiers are not an option at this point.

Basically, he is looking for a tire that is better than stock (more grip), that he can drive to the event on, drive back home, and change to street rubber. Anything that can take that (100+ mile trips x 8 ) and not heat cycle to death in one season == good

Drakken:: When you had clearance issues, it was on the inside of the tire on a +48 offset 8" rim? You ever run the 255s on the 7.5" (or I missed it)? What alignement settings were you running?

Just trying to help out, Chris

- dow
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Old 12-23-2005, 12:25 PM   #25
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Used Toyo RA-1's for sale here ... 3 to 4 heat cycles. In WRX perfect 235/40/17. I don't think they have other sizes.

http://tinyurl.com/8ro2w

Goto Clearance/Used items at the bottom of that page ... find RA-1's. This company races BMW's in the World Speed Challenge series ... where the RA-1 is the Spec tire.

Two Quality levels, $50 and $100 a piece ... perhaps a good way to try them out.
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