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Old 03-31-2005, 04:36 PM   #1
ndw1138
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Default widest tire that can be run on a STi without rolling fendors?

I'm interested in going up to 235 which should be possible on 17X8.5? But my question is what's the widest tire that can go on a 04-05 STi without having to roll the fendors? Would appreciate any info..

thank you

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Old 03-31-2005, 04:58 PM   #2
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Well I run a 255/40-17 on a Rota 17x8 -48 offset with no problems. This is on a completely stock 05 STi. I am pretty sure they put a 275/40 on stock wheels on the 05 STi's for autocrossing as well, but I don't have concrete proof on that.

235/40s on a 17x8.5 wheel is not problem. I don't think 255/40 on the 8.5 would be either.
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Old 03-31-2005, 07:38 PM   #3
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^at stock height
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Old 03-31-2005, 08:44 PM   #4
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Quote:
Originally Posted by vtecTHIS
^at stock height
I'll be putting on STi Coilovers (adjustable) before these wheels go on (track tire/wheels). I believe they lower the car about 3/4" by default. So should I assume this is too low for 245's?

And thank you both for the comments, really appreciated.

nathan
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Old 03-31-2005, 09:03 PM   #5
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There are a number of other concerns that you are ignoring. I have 17X8 wheels with the stock Bridgestones on them and they rub in the rear....reason why? The offset, these wheels, VOLK TE37s, have a +44 offset which makes for a much wider outside edge. Oddly though the outside edge of the wheel/tire only sits approx 15mm wider so it still suprises me that they rub but oh well

Good Luck
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Old 03-31-2005, 11:23 PM   #6
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You should also consider camber, suspension height and tire geometry - some tires have larger radii on the edge than others - so they may be the same size in terms of model number but they may be different in terms of overall width at the location next to the fender. The stock tires have small radii - they're really wide for 225's. Pretty good tread width. This should be considered along with the offset of the wheels, wheel size, etc.
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Old 03-31-2005, 11:49 PM   #7
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I am running 255/40R17 Azenis (wider than your average 255) on stock 17x8 BBS wheels with STI Pink springs. No problems at all. -1.9 camber in front, -1.8 camber in rear (camber achieved with camber bolts, NOT plates - this is worst case scenario for clearance between tires and struts). There is about a 1/2" gap between strut and tire in the rear and about 3/8" gap in the front.


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Old 03-31-2005, 11:59 PM   #8
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^ am I seeing double?
Are there 2 STi's in your garage?
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Old 04-01-2005, 12:25 AM   #9
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Quote:
Originally Posted by zavigm
^ am I seeing double?
Are there 2 STi's in your garage?
yeah but one of them is a 2004 with S-03s - belongs to my roommate.
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Old 04-01-2005, 01:46 PM   #10
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2004 STi, pink springs, -1.7 camber rear, -2.8 front. 235/40-17 on 17x7.5 (OEM size) fits with lots of room to spare. 245/40-17 Kumho Ecsta V700 (R compound, wider than street tires) fits on 17x8.5 with no rubbing unless you're autocrossing with a full passenger load in the back seat. 225/45-17 Hoosier A3S04's on 17x8.5 (ET48 offset) require 4mm of spacers to keep away from the strut body, but otherwise fit with only minor rubbing.

Based on this and what I've read, 255/40-17 race tires on a 17x8.5 rim (one inch larger than stock) will not fit without rolling the rears on a 2004 STi. Perhaps aftermarket coilovers would give more interior room, 2005 STi's apparently have more room, and obviously going to a smaller rim gives you far more options (e.g. 17x7.5 OEM rim fits 255/40-17 Victoracers with plenty of room).

So, given the scope you requested: 2004 STi with 17x8.5 rims (what offset or type?), 235/40-17 tires shouldn't be a problem, 245/40-17 tires will probably fit but will likely require at least removing the fender protector trim, and my guess is that 255/40-17 tires will need minor rolling. As others have stated, the tire brand and geometry does matter as well.

I have a 2004 STi, now with coilovers, 17x8.5 rims, and just got my letter this morning from Tire Rack that my 255/40-17 Victoracers have shipped. So I'll be finding out in a week or two just how much work it is to make them fit.
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Old 04-01-2005, 06:26 PM   #11
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Thank you! much appreciated.

Interesting, why would the 05 have more room? The hub/bearing is really that much different in size? That's sorta suprising.. I actually do have a 05, and the wheels I'm considering are SSR comps at 17X8.5 with 235 or 245 45 side wall Bridgestone S03's. But as mentioned I will be dropping about 1/2-3/4", but the camber will stay rather neutral. I guess best bet is to install suspension and then measure it out as best as possible with current stock wheels..

again I appreciate any feedback..

nathan



Quote:
Originally Posted by WRX_Mundi
2004 STi, pink springs, -1.7 camber rear, -2.8 front. 235/40-17 on 17x7.5 (OEM size) fits with lots of room to spare. 245/40-17 Kumho Ecsta V700 (R compound, wider than street tires) fits on 17x8.5 with no rubbing unless you're autocrossing with a full passenger load in the back seat. 225/45-17 Hoosier A3S04's on 17x8.5 (ET48 offset) require 4mm of spacers to keep away from the strut body, but otherwise fit with only minor rubbing.

Based on this and what I've read, 255/40-17 race tires on a 17x8.5 rim (one inch larger than stock) will not fit without rolling the rears on a 2004 STi. Perhaps aftermarket coilovers would give more interior room, 2005 STi's apparently have more room, and obviously going to a smaller rim gives you far more options (e.g. 17x7.5 OEM rim fits 255/40-17 Victoracers with plenty of room).

So, given the scope you requested: 2004 STi with 17x8.5 rims (what offset or type?), 235/40-17 tires shouldn't be a problem, 245/40-17 tires will probably fit but will likely require at least removing the fender protector trim, and my guess is that 255/40-17 tires will need minor rolling. As others have stated, the tire brand and geometry does matter as well.

I have a 2004 STi, now with coilovers, 17x8.5 rims, and just got my letter this morning from Tire Rack that my 255/40-17 Victoracers have shipped. So I'll be finding out in a week or two just how much work it is to make them fit.
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Old 04-01-2005, 07:22 PM   #12
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Quote:
Originally Posted by ndw1138
Thank you! much appreciated.

Interesting, why would the 05 have more room? The hub/bearing is really that much different in size? That's sorta suprising..
For a couple reasons really:

1) the 05STi rear fenders are already wider than the 04STi
2) the 05STi hubs are stiffer so there's less flex at the hub to let the wheel/tire to deflect inward (to rub struts) or outward (to rub fenders) on cornering.
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Old 04-05-2005, 05:10 PM   #13
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Thanks for the '05 answer, nluhr.

Here's a good reason why the specific tire and geometry matter. Click for larger image with readable text:



All tires unmounted. The two sets on the left are both the same rated size: 225/45-17. You can see there's a big difference in actual width (as well as weight and price, with the Michelin's actually being the most expensive since the Hoosiers went on sale). That extra inch of width can make a big difference in fitment. I'd hope this is exagerated given I'm comparing a street tire (albeit a pricey "ultra high performance all-season") to a Hoosier race tire, but I'm sure there is some variation in all examples.

In a few days I should be able to show RE070's mounted on 17x7.5, new A3S04's mounted on 17x7.5, and used A3S04's mounted on 17x8.5. All the same 225/45-17 size.
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Old 04-06-2005, 04:22 PM   #14
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^^ thats crazy!!! i kneww thre was a differencs but that is a lot

travis
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Old 04-06-2005, 04:55 PM   #15
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http://forums.nasioc.com/forums/showthread.php?t=746983

according to the pix in this thread, the hoosiers are 20mm wider each, than the ps2 and about the same height difference as your tires that are the same size.

weird.
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Old 04-06-2005, 06:24 PM   #16
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Quote:
Originally Posted by WRX_Mundi
Thanks for the '05 answer, nluhr.

Here's a good reason why the specific tire and geometry matter. Click for larger image with readable text:



All tires unmounted. The two sets on the left are both the same rated size: 225/45-17. You can see there's a big difference in actual width (as well as weight and price, with the Michelin's actually being the most expensive since the Hoosiers went on sale). That extra inch of width can make a big difference in fitment. I'd hope this is exagerated given I'm comparing a street tire (albeit a pricey "ultra high performance all-season") to a Hoosier race tire, but I'm sure there is some variation in all examples.

In a few days I should be able to show RE070's mounted on 17x7.5, new A3S04's mounted on 17x7.5, and used A3S04's mounted on 17x8.5. All the same 225/45-17 size.

What size are the Kumho victoracers on the far right? 255/40?
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Old 04-06-2005, 06:46 PM   #17
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click on the picture buddy....




As a SAFE assumption.. I will tell you this...

First off, its all about wheel offset here..

I run a 18x8.5 +48 offset... I also use 235/40s on these... I find that there is PLENTY of room in the front, on the OUTSIDE of the fender to run 255s faily easily... the inside I'm not so sure about. There was about a finger width between the rim and my TEINs when I put the wheel on by itself. In the rear, the clearance between the rim and the coilover is about the same... and here's a picture of the outside...





As you can kinda see here, there's plenty of room in the front.


I run -1.5 camber in the rear/-3.0 in the front.


My personal plan is to try 255s next and roll my rear fenders.. I might also get some spacers... maybe a 3mm or a 5mm to try in the front at least if there's a inner clearance issue.

Last edited by jsalicru; 04-06-2005 at 06:57 PM.
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Old 04-07-2005, 01:13 AM   #18
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Yes, the tires on the right are 255/40-17 Victoracers. I had the Hoosiers mounted today and they're quite a bit wider than the 235/40-17 RA-1's they replaced. The RA-1's have the gearing advantage though (not to mention usable lifetime and hence price).

jsalicru, nice photos. Here are mine with the 225/45-17 Hoosier A3S04 on Rota 17x7.5 SDR's (17x7.5 +48mm -- same as stock size but 5mm less offset), no spacers, coilovers set to 13" height hub-to-fender:




Lining up behind the Camaros with these tires in 335/35-17 size is intimidating. I'm surprised how much these fill the fender even with the 7.5" wheels. But it's not like these are tires you'd use every day.
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Old 04-07-2005, 01:33 AM   #19
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Quote:
Originally Posted by jsalicru
click on the picture buddy....


My personal plan is to try 255s next and roll my rear fenders.. I might also get some spacers... maybe a 3mm or a 5mm to try in the front at least if there's a inner clearance issue.
Hi, I am wondering what tire(brand/model) are you running? Also, if you don't mind, can you snap a few close-up shots of your tire on the rim. I want to see how 235 sits on 8.5 inch rim as I am debating whether to go 235/40 or 255/35 on my 8.5' rim
Thanks
Cal
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Old 04-08-2005, 07:03 PM   #20
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Without considering wheel gap...what is the widest tire that an 8" wide (STi) rim can hold?
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Old 04-08-2005, 08:35 PM   #21
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Quote:
Originally Posted by nhluhr
I am running 255/40R17 Azenis (wider than your average 255) on stock 17x8 BBS wheels with STI Pink springs. No problems at all. -1.9 camber in front, -1.8 camber in rear (camber achieved with camber bolts, NOT plates - this is worst case scenario for clearance between tires and struts). There is about a 1/2" gap between strut and tire in the rear and about 3/8" gap in the front.

I don't understand this. My '05 STI with stock wheels and tires has only 1/2" gaps between the strut body and the tire in the rear. Do you have wheels spacers?

Thanks
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Old 04-08-2005, 09:04 PM   #22
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all depends on offset
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Old 04-09-2005, 04:36 AM   #23
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just the wheels themselves...if they were removed from the car.
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Old 04-09-2005, 04:59 AM   #24
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Quote:
Originally Posted by 04STiguy
I don't understand this. My '05 STI with stock wheels and tires has only 1/2" gaps between the strut body and the tire in the rear. Do you have wheels spacers?

Thanks
nope. I would never run spacers. Perhaps my guess at the gap was off or perhaps yours is, but it is definitely "enough".
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Old 04-09-2005, 10:27 AM   #25
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I am running toyo ra-1's 255/40 all around with no fender rolling at all. Front wheels are 17x9 rears 17x8.5. I do have like 3 deg neg camber front 2.5 rear. But there is no rubbing issues. Car is lowered on zeal vunction v6 with 12k/10k setup.
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