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02-18-2005, 09:15 AM | #1 |
Scooby Newbie
Member#: 69674
Join Date: Sep 2004
Location: Maryland
Vehicle:2005 WRX STi Blue! |
What size tires for AX on an '05 STI?
I'm going to be running AS this year in my new '05 STI. I'm thinking about trying some RA-1's but I'm wondering what size. I was considering 255/40/17. Also, I have a set of Rota Torques (17x8), and I was wondering what wheels would work better for the R's, the stock BBS (also 17x8 now) or the Rota wheels. Not sure there is a big enough difference to worry about it. The main reason I'm thinking about Toyos is the $750 gift certificate for Toyos I won last month. Otherwise I'd probably be thinking about V710 Kumhos.
This car is going to be a lot different than the Miata I ran last year on Azenis. Thanks Steve
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02-18-2005, 10:02 AM | #2 |
Scooby Specialist
Member#: 39191
Join Date: Jul 2003
Location: Houston
Vehicle:2004 WRX STi WRB Red 1990 Spec Miata |
Steve...
Congrats! My opinion is to use the BBS wheels for autocross. They are as light as anything else on the road and because they are forged, not cast like the Rotas, they may be safer -- The STi is a heavy car with immense power and grip. The STi tends to be quite hard on tires (or I do, not sure which)... so budget for that. I've not run the RA-1's on an autocross (just on the specmiata) but I've heard very good things about them and the gift certificate makes it a no-brainer, but they may not like the lack of camber in the front end of the STi. The Kuhmo 710's are also getting great reviews and I'll be running them for the El Paso nationals if I get to go. Kuhmo designed them to be tolerant of camber-challenged cars like ours. Right now I'm running the V700s and have found them very good for the STi. The only tires I have had bad luck with are the Dunlop Sport Race which I had to buy when the V700's were in short supply. By the way, the 710's come in either 245 or 275 for a 17". I have an 04 with the 7.5" wheels so I would prefer the 245's.You have the 8" wheels, so the 275 might fit without too much tread curl. However, Kumho recommends a 9" wheel for the 275, so I'd be careful about using the 275. Toyo also recommends a 9" wheel for the 275. As they say.... YMMV Now you just have to figure out how to get the beast to rotate and how to ignore the weird things the DCCD does. Enjoy!!! |
02-18-2005, 10:41 AM | #3 |
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I run a 275 710 on a 7.5" rim with no problems. Mounting them took a while though.
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02-18-2005, 10:42 AM | #4 |
Scooby Newbie
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My wife is currently using RA-1s for her WRX wagon (running in DS). Driving her wagon at an AX school and the Subaru Challenge (Norhteast?) is all I've done on R's so far. All my other AX time has been in a Miata on Azenis and somewhat worn stock tires. They certainly do stick well, but I'm wondering if we should have gotten them shaved before running them. They have an odd bumpy wear pattern now. And they are VERY loud! I think she's going to get them flipped around soon. Maybe that's the result of being camber-challenged?
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02-18-2005, 11:30 AM | #5 |
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I am running AS with my 05 Sti this year as well. Currently using some Rota Slipstreams (17x8 - 48 offset) and some shaved 255/40-17 Kumho Victos on them. Which, fit just fine on a stock 05 STi. The combination weights exactly 47 lbs, and on the same scale the stock BBS & RE070's weight 47 lbs as well. So, at least I am not adding weight from what I drive everyday.
If I used the BBS wheels to autocross the weight would come down about 6 lbs a wheel (3 lbs less a wheel and tire), but I would rather not mess up those wheels as they are much more expensive to replace. I went with the kumho victos because they are a great value (performance & price). 710's would have been my 1st choice, but the budget did not allow. I was considering the RA-1s as well, but they are a bit more expensive than the kumhos, and from my research are more of a track day tire. Take more time to warn up and not as good for autocross, but I am sure willlast much longer. I used to run Azenis sports on my STX WRX and the r-compound kumhos stick sooo much better than them. It is a different world. Last edited by rankink; 02-18-2005 at 11:36 AM. |
02-18-2005, 11:56 AM | #6 |
Subtly Outspoken
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Vehicle:OG05 STi 51E |
you can fit 275's on s 8 but its pretty tight...255 would probably be the best choice if your racing local....national stuff...the tires will be to narrow.....
You might have a clearence issue as well on the rear unless you go with a different offset....48mm might be tight back there for a even a 255...so you might consider a 43 offset for race only type situation.. Bill |
02-18-2005, 12:07 PM | #7 | |
Scooby Specialist
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Quote:
I have the 255/40 on my 17x8 rotas with the 48 offset and there are no clearance/rubbing issues front and back. 275's would be extremely tight though. |
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02-18-2005, 12:42 PM | #8 |
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I'm just not from the 'more is better' school of thought when it comes to wide tires on narrow wheels. Maybe I need to reconsider....
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02-18-2005, 12:59 PM | #9 | |
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02-18-2005, 01:06 PM | #10 | |
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Quote:
For sure on the STi a 275 is going to be faster than a 255. It don't think there is a safety issue running 275's on a 8" wheel either. |
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02-18-2005, 01:13 PM | #11 | |
Street's closed, pizza boy
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02-18-2005, 01:23 PM | #12 | |
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02-18-2005, 01:25 PM | #13 | |
Scooby Specialist
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02-18-2005, 01:27 PM | #14 | |
Scooby Specialist
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02-18-2005, 02:21 PM | #15 | |
Scooby Specialist
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02-18-2005, 02:38 PM | #16 | |
Scooby Specialist
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02-18-2005, 02:43 PM | #17 | |
Scooby Specialist
Member#: 12901
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Vehicle:2005 STi/95 VX Pastelito Racing / SFSOC |
Quote:
of course... I fully inspect wheel, tires, suspension, etc the day before each race. |
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02-18-2005, 02:48 PM | #18 | |
Subtly Outspoken
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Quote:
about 1" more grip...and better load distribution..on all 4 corners...meaning more contact patch in ANY given scenerio..= MORE Grip....Better cornering loads.. 315's are what some ESP contenders are going to run on STi's this year... Bill |
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02-18-2005, 02:53 PM | #19 | |
Scooby Specialist
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02-18-2005, 03:10 PM | #20 | |
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02-18-2005, 03:11 PM | #21 | |
Subtly Outspoken
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Bill |
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02-18-2005, 03:12 PM | #22 | |
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Quote:
Go with the RA-1's, particularly if they're heavily subsidized. They'll stand up to new car syndrome-based mistakes better than the alternatives (, said the guy who made a bunch while switching from his 2 seater to a subie). That said, those weird grooves on you all's other set would give me pause, too. |
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02-18-2005, 03:16 PM | #23 | |
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02-18-2005, 03:28 PM | #24 | |
Scooby Newbie
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Quote:
We did an autocross school at the end of the year, late october I think, and the tires were really noisy, almost sounded like something rubbing, but it was just tire noise. |
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02-18-2005, 03:31 PM | #25 | |
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