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Old 10-04-2012, 03:07 PM   #2051
sc00by4life
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17x8 +45 would probably be the ideal setup.
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Old 10-11-2012, 02:47 AM   #2052
Frey Bone
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Default Very straight forward question.

Could this thread be more confusing?

If nirvana is:
8.0" ....... +43 to +47 (assuming for a stock suspension set-up)


...and stock STI wheels (05-07) are 8" wide--

Why are the stock wheels +53 offset?

Did I read through ALL 53 odd pages. NO. Did I read through a bunch?

YES.

Did I do a bunch of searches?

YES
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Old 10-11-2012, 03:16 AM   #2053
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Quote:
Originally Posted by Frey Bone View Post
Could this thread be more confusing?

If nirvana is:
8.0" ....... +43 to +47 (assuming for a stock suspension set-up)


...and stock STI wheels (05-07) are 8" wide--

Why are the stock wheels +53 offset?

Did I read through ALL 53 odd pages. NO. Did I read through a bunch?

YES.

Did I do a bunch of searches?

YES
why don't our cars have all forged internals? why aren't the EJ255/7 tunes better? why do USDM sti seats suck? hell, why are upgrades even available for cars?

Things aren't always the "best" from the factory.
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Old 10-11-2012, 03:25 AM   #2054
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Damn, the USDM seats sure do suck, thanks for reminding me.

...so, is it the case the consensus is that +43 - +47 is a "better" offset.

When it comes to offset- (which really isn't explained here btw):

Clear the brakes
Clear the suspension
Doesn't rub on the fender
Isn't hard on the wheel bearings

I'm guessing by better- the 43-47 measure beats the +53 in these facets of fit?

Are there any other aspects I'm missing?

Thank you by the way.
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Old 10-11-2012, 04:00 AM   #2055
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offset doesn't really mean much in terms of brake clearance, that is almost purely based on wheel design.

lower offsets also widen the track of the car, reducing weight transfer.

going too low results in an increased scrub radius and moves the "dave point" away from the center of the contact patch, reducing steering feel and kickback.
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Old 10-11-2012, 04:24 AM   #2056
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...ok, good, I like where this is going.

So- you go too low, and the tire rubs on the fender? -is also harder on wheel bearings?
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Old 10-11-2012, 04:35 AM   #2057
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...is there any formula that correlates offset (in mm) to change in scrub radius?

Most of the information I found on scrub radius talked mostly in terms of ease when parking, or what happens in the event of a braking circuit failure- not in terms of changes in handling while driving + or -
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Old 10-11-2012, 04:39 AM   #2058
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...or better yet- do you know where the Dave point would be on a stock '05 sti relitave to a wheel with say +47 offset?

That is, do you know if the Dave point is inside the center of the tire on the stock +53 wheel/suspension set up?

THANKS!
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Old 10-11-2012, 02:14 PM   #2059
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Quote:
Originally Posted by Frey Bone View Post
...ok, good, I like where this is going.

So- you go too low, and the tire rubs on the fender? -is also harder on wheel bearings?
Whether something rubs on the fender has a few different contributing factors. The combination of wheel width + offset being one of them, the second being tire size.

Quote:
Originally Posted by Frey Bone View Post
...is there any formula that correlates offset (in mm) to change in scrub radius?

Most of the information I found on scrub radius talked mostly in terms of ease when parking, or what happens in the event of a braking circuit failure- not in terms of changes in handling while driving + or -
The change in scrub radius is mostly only noticed at low speed tight cornering. . As far as a formula that directly correlates to track width to how much scrub radius is increased, I'm not exactly sure off the top of my head, but I don't doubt thats it exists somewhere on the internet.

Quote:
Originally Posted by Frey Bone View Post
...or better yet- do you know where the Dave point would be on a stock '05 sti relitave to a wheel with say +47 offset?

That is, do you know if the Dave point is inside the center of the tire on the stock +53 wheel/suspension set up?

THANKS!
A change in 5mm would effectively move the dave point a fraction of that length rearward. Its definitely a subtle difference, but not nearly enough of to outweigh the benefits of the *slightly* wider track. Idealy, the dave point should be just be centered on the tires contact patch. Obviously....there are plenty of ways to adjust the dave point in relation to relative offset, but that is far beyond the average enthusiests understanding of steering and suspension.

Again though.......this is mostly relevant for track cars. Will the average driver notice these things under normal conditions? no.

Last edited by sc00by4life; 10-11-2012 at 03:36 PM.
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Old 10-11-2012, 08:58 PM   #2060
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07 STi
Coilovers
245/40/17
17X9 et 30 or 42?
Will be rolling front and rears.

Thanks for opinions.
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Old 10-11-2012, 09:26 PM   #2061
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^^ Disregard. I read the details wrong. It was +25 not +30. I'm definitely not going that low... Guess I'll stick with +42
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Old 10-11-2012, 10:42 PM   #2062
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2012 wrx here. looking at some 18x9.5s or 18x10s will be soon lowered on BC coilovers. just wondering il stay within the 30-40offset range. lower being it will poke more. i just want it inside the fenderwells. im looking at either 235/45/ or a little more beef 245 or 255...
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Old 10-11-2012, 11:26 PM   #2063
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Quote:
Originally Posted by S1CkWrx
2012 wrx here. looking at some 18x9.5s or 18x10s will be soon lowered on BC coilovers. just wondering il stay within the 30-40offset range. lower being it will poke more. i just want it inside the fenderwells. im looking at either 235/45/ or a little more beef 245 or 255...
Run an 18x9.5, roll all around and have fun going low with a 265.

Still at a loss as why people buy a brand new car and put the cheapest coilovers possible on it.
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Old 10-11-2012, 11:47 PM   #2064
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car will be on air by the end of winter. just need something to hold me over
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Old 10-16-2012, 06:30 PM   #2065
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i have 04 wrx with 17x8 running 235/35/17 and no issues future i would like to have 17 8.5 since most have issues with 17 9 and run 245/40 or 45/17 for better handling???
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Old 10-16-2012, 07:54 PM   #2066
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I searched and I read...........would appreciate a quick answer. Whats great about this site is all the different opinions it also drives you crazy sometimes. My 2010 Sti stock wheels are 18X8.5 55 offset........I'm getting ready to buy a winter setup. Rim size would be 17x7-17X7.5-or 17X8 depending on which wheel I choose. If I stay with an offset of 45 or higher I should have no issues with brake clearance ???.....The last thing I want to do is ship back 4 wheels. Thank you in advance !!
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Old 10-16-2012, 10:13 PM   #2067
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It's going to be an individual wheel basis. In a totally generic standpoint, a lower offset will be more likely to clear the brakes. But really, individual wheel design matters infinitely more.
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Old 10-17-2012, 01:10 AM   #2068
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Quote:
Originally Posted by RobNJ36
I searched and I read...........would appreciate a quick answer. Whats great about this site is all the different opinions it also drives you crazy sometimes. My 2010 Sti stock wheels are 18X8.5 55 offset........I'm getting ready to buy a winter setup. Rim size would be 17x7-17X7.5-or 17X8 depending on which wheel I choose. If I stay with an offset of 45 or higher I should have no issues with brake clearance ???.....The last thing I want to do is ship back 4 wheels. Thank you in advance !!
Offset means literally nothing in terms of brake clearance.

It's ALL based on the wheel design.
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Old 10-17-2012, 06:05 PM   #2069
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Guys..........understood thank you.......So if I order from Tire Rack or Discount Tire the wheels they have in stock specified for my vehicle all should fit with no clearance problems then. I assume they did their homework? 17x7 or 17X8 with a 45 or 47 offset all good ?
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Old 10-17-2012, 09:18 PM   #2070
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why don't you pm Luke@TireRack and have him help you out if you are unsure .
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Old 10-18-2012, 08:08 PM   #2071
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All good...got it sorted out thank you
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Old 10-29-2012, 03:43 PM   #2072
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Default Rota Grid Fitment

Disregard post

Last edited by 11stikmd; 10-29-2012 at 09:00 PM. Reason: Will keep searching threads
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Old 11-06-2012, 06:19 PM   #2073
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Helped a lot
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Old 11-07-2012, 07:38 PM   #2074
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I'm looking to purchase enkei RPF1 in an 18 inch wheel what is a good size to where is clears brembos and me not having to rolls fenders also same for a set of NTO3's as well.

Thanks,
Grant
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Old 11-09-2012, 12:33 PM   #2075
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What kind of fender mods will I be looking at with a 17x9 +25 or +35 offset wheel? On a 08-10 body style sedan With a 235/45 tire. EDIT forgot to mention im on coilovers.

Last edited by Slow Scoobie; 11-09-2012 at 06:21 PM.
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