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Old 04-13-2004, 03:40 PM   #151
Kean
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.....so does the Audi TT, Toyota Celica, PT Cruiser, some Neons, etc.
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Old 04-15-2004, 10:20 PM   #152
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Quote:
Originally posted by wRx14pSi
this is interesting..

so advan made the RG's in 17 8.5 +43 offset. now i dont see any other cars that fit the 100 bolt pattern and stuff.. so i assume Advan made this size for subaru..

so would it fit our car with no probs? i am sure they know what they are doing.. .


anyone with insights please help .. i need to buy rims!!
Well, I think those wheels are for cars that are 'differently optimized'. All that matters is stuffing as much rubber as possilbe into the wheelwell, while at the same time having a good sidewall profile with those Avdans. Performance is chosen over all other concerns.

Now, those wheels and tires occupy the same space as stockers, but just add a little on the outside edges. It doesn't sound as scary if you view it that way.

Subaru doesn't share the bore with other cars that have 5x100mm bolt patterns (as far as I know), and doesn't share the offset either. Personally, I'd like to see them go to a larger diameter/stronger bolt circle. Hey, why not go whole hog and copy Porsche's specs?
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Old 04-17-2004, 10:46 AM   #153
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ok - so i'm a complete newbie, and from down under to boot, but Eric, I can't believe how patient you have been in this post. I just spent 30 odd minutes of my life (which, mind you I will never recover) reading this whole thead to date in detail and must have seen you outline the same stuff 50 time or more (so I'm exagerating a little bit, but not much).

You guys in the US are lucky with choice in wheels for Subes. I have been looking for wheels for my MY04 Forester XT, and so far can only find stuff around 17/7.5 with +40m offset available locally (unless I go Prodrive stuff, which is like AUS$1000 a wheel before tyres ... saving, sving, saving).

Thanks for the very informative thread. Much appreciated guys.

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Old 04-21-2004, 09:35 PM   #154
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Default Another Offset Question

What would be the better offset for GC8 with 18x7.5 rims? +42 or +48?

They suggested +42 but what I am reading that the +48 would be better.

Let me know.

Also tires are 215/40-18.
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Old 04-22-2004, 06:44 PM   #155
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The 215 is the widest tire you can run on a GC8 (2001 or earlier).

I am running 215/45x17 ET50 on a 2000 2.5RS.

You shouldn't have any clearance problem with the strut or the fender lip with ET48,which will move the tire out 6mm or approximately (~) 0.2in. further than stock . It will also put the center of the wheel closer to the stock location, than the ET42 will, for better bearing wear.

The ET42 will move the tire (6mm~0.2in. further, 11mm~0.4in. total) away from the strut and toward the fender lip. It will also give you more BBK clearance, but probably increase the stress on the bearing.
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Old 04-27-2004, 06:36 PM   #156
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so a 7.5" rim with 42mm offset won't fit?
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Old 05-01-2004, 11:34 PM   #157
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Either the 42 or the 48 will fit but the 42 will limit tire width to 225 or less under the rear fender. As stated previously, you will experience negative effects when moving the wheel that far outward.

Stick with the +48!
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Old 05-02-2004, 03:19 PM   #158
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ok thanks man, that eliminates the rim i wanted....i'll keep looking..

good thread!
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Old 05-19-2004, 02:48 AM   #159
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Quote:
Originally posted by North Ursalia

Width .... Offset

6.5" ....... +53 to +55
7.0" ....... +50 to +53
7.5" ....... +47 to +50
8.0" ....... +43 to +47
I was shopping around with these offset numbers jotted down when i see this on www.subaruwrxparts.com but for the STI rims, the numbers are:

2004 WRX-STi Gold Wheels
17" x 7.5" +53 offset

I have an 04 WRX Sedan. Which should i use to as a reference? Offset +47~50 or +53?
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Old 06-07-2004, 06:57 PM   #160
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ok ok heres my question... is 17x7.5 with offset of +48 ok for my impreza?
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Old 06-17-2004, 09:14 PM   #161
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I just began looking for new wheels for my car and of course I want the perfect size, offset and all...

so rather than ask around I decided to just educate myself on the topic...

after spending a few hours stairing at various ways to calculate offsets and diagrams of wheel measurments I dont understand why the offset changes with width

the offset is in place and shouldn't be changed as to not put an unusial constant stress on the berings. if the offset is the distance measured from the centerline of the wheel I assume it it such so that the berings (or stresses related to centering the berings) are located at the centerline. if this is so then the offset should never change when you increase the width of the wheel because if you never change the offset the weight (of the car) on the inside of the wheel will always be dispursed the same as the weight (of the car) on the outside

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Old 06-17-2004, 09:48 PM   #162
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Quote:
Originally posted by twistedsymphony
the offset is in place and shouldn't be changed as to not put an unusial constant stress on the berings. if the offset is the distance measured from the centerline of the wheel I assume it it such so that the berings (or stresses related to centering the berings) are located at the centerline. if this is so then the offset should never change when you increase the width of the wheel because if you never change the offset the weight (of the car) on the inside of the wheel will always be dispursed the same as the weight (of the car) on the outside
I'm not too sure I follow you. If I'm right, I think you're wondering why anyone would change from the stock offset since it would obviously change the way the weight/stress is distributed.

As you begin to increase the wheel width (while keeping the same offset), rubbing issues may become a problem on the inner tire/wheel (i.e. against the strut). In order to fit some wheels you need to compromise by selecting a lower offset (shifting the wheel outward). Obviously, there's a balance that must be reached so you still have clearance (both inboard & outboard) while retaining an offset that's as close to stock as possible. ....hope this makes sense ....I'm a bit tired right now.

- Kean
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Old 06-18-2004, 12:02 AM   #163
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Quote:
Originally posted by Kean
I'm not too sure I follow you. If I'm right, I think you're wondering why anyone would change from the stock offset since it would obviously change the way the weight/stress is distributed.

As you begin to increase the wheel width (while keeping the same offset), rubbing issues may become a problem on the inner tire/wheel (i.e. against the strut). In order to fit some wheels you need to compromise by selecting a lower offset (shifting the wheel outward). Obviously, there's a balance that must be reached so you still have clearance (both inboard & outboard) while retaining an offset that's as close to stock as possible. ....hope this makes sense ....I'm a bit tired right now.

- Kean
yes, after doing more research and thinking about it, this is what i've concluded - it's mostly about the clearance and compromise. i think i'd still rather stick with factory specs for rims so i'm going to put off my purchases until i can afford it
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Old 06-18-2004, 12:44 AM   #164
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I can understand that part of it if you were going really big but as long as it's 7.5 or smaller I dont understand why it'd be a concern...

hitting up a few subaru parts sites and looking at wheel specs for the impreza and legacy for everything from the crappy low level steel wheel up to the expensive dealer optional prodives I made up this little chart with all the different subaru designed dimensions. having done an internship with general motors I know that that car manufacturers are sticklers for precise wheel offsets (amoung other wheel things) because of the concerns with bering wear and braking performance

anyway I drew up this little chart:

subaru offsets (found on official wheels made by or produced for production subarus)
15"x6" +55mm
16"x6.5" +55mm
16"x6.5" +53mm
16"x7" +53mm
17"x7" +55mm
17"x7" +53mm
17"x7" +52mm
17"x7.5" +53mm
17"x7.5" +53mm
18"x7.5" +53mm

it can be seen pretty plainly that the +53 to +55 range is the optimal offset for wheels under 7.5" wide... these are offered by subaru as dealer options in these sizes so it's almost guaranteed that there'll be no rubbing/bearing issues at this offset.

with that said I've read/noticed that 7" is as wide as you can go on pre 2002 impreza at this offset with out fender rubbing, past that fender rolling needs to be done. so I'd assume if you went with a lower offset it'd be even worse
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Old 06-18-2004, 12:04 PM   #165
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Quote:
Originally posted by twistedsymphony
I can understand that part of it if you were going really big but as long as it's 7.5 or smaller I dont understand why it'd be a concern...

hitting up a few subaru parts sites and looking at wheel specs for the impreza and legacy for everything from the crappy low level steel wheel up to the expensive dealer optional prodives I made up this little chart with all the different subaru designed dimensions. having done an internship with general motors I know that that car manufacturers are sticklers for precise wheel offsets (amoung other wheel things) because of the concerns with bering wear and braking performance

anyway I drew up this little chart:

subaru offsets (found on official wheels made by or produced for production subarus)
15"x6" +55mm
16"x6.5" +55mm
16"x6.5" +53mm
16"x7" +53mm
17"x7" +55mm
17"x7" +53mm
17"x7" +52mm
17"x7.5" +53mm
17"x7.5" +53mm
18"x7.5" +53mm

it can be seen pretty plainly that the +53 to +55 range is the optimal offset for wheels under 7.5" wide... these are offered by subaru as dealer options in these sizes so it's almost guaranteed that there'll be no rubbing/bearing issues at this offset.

with that said I've read/noticed that 7" is as wide as you can go on pre 2002 impreza at this offset with out fender rubbing, past that fender rolling needs to be done. so I'd assume if you went with a lower offset it'd be even worse
I think it's important to also mention that there may not be a wealth of aftermarket options available in that offset (which may be a another reason someone opts for a lower than stock offset). ....or perhaps an owner wants a little more room so they can go with a more aggressive camber adjustment.

There are several reasons why people may choose a lower offset, but I think the real question has always been how far can you go before adversly affecting the handling characteristics or causing excessive stress on components. To be quite honest, a few millimeters should make little or no difference.

- Kean
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Old 06-19-2004, 10:51 PM   #166
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okay- i want some 17x8 shoes for my 04 wagon, can they fit correcty?
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Old 06-21-2004, 12:16 PM   #167
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Default arrrrrrrrrrrrrrrrrggggggggg

I read this whole thread top to bottom and only a couple mentions of models other than imprezas were mentioned.
I'm wondering if I have more room to work with in my '00 legacy GT. I have a deal on BBS RKs 17X7 +48 offset and want to put medium sized brakes on (perrin or WRX) but am not sure they will clear.
Help
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Old 06-24-2004, 09:00 PM   #168
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Quote:
Originally posted by Kean
I think it's important to also mention that there may not be a wealth of aftermarket options available in that offset (which may be a another reason someone opts for a lower than stock offset). ....
I think it should be noted that there arn't may COST EFFECTIVE aftermarket options... a lot of high end cars use the 53mm offset includeing several porsches and many corvette models...

many of the very high end wheel manufacturers (and by high end I mean $600+ per wheel high end) offer a plethera of +52 through +70mm offset sizes...

lets face it we have expensive tastes
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Old 06-24-2004, 09:22 PM   #169
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Quote:
Originally posted by twistedsymphony
I think it should be noted that there arn't may COST EFFECTIVE aftermarket options... a lot of high end cars use the 53mm offset includeing several porsches and many corvette models...
They may use similar offsets, but what about the bolt pattern? I thought most Corvettes were ~5x120 and Porches were usually ~5x130?
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Old 07-10-2004, 12:39 AM   #170
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Quote:
Originally posted by vile
how do u measure offset? or, how is offset measured?
If someone already responded to this my apologies. Here's how to measure a wheel's offset:

1) Measure the wheel's diameter outer lip-to-outer lip. Obviously it's easier if there's no tire mounted but it can be done either way. Call that D.

2) Measure the distance from the inside lip to the hub mounting surface. See the Tire Tech thread for visuals. Call that H.

3) Offset = H - (D/2). A positive number means it's proably a wheel for a FWD car. Negative means probably a RWD car. Really large positive number - it's a Subie!!!

Last edited by hal9k; 07-10-2004 at 02:45 PM.
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Old 07-10-2004, 08:02 PM   #171
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I have found no where in this thread a satisfying bit of information regarding fitting 17x7's with a +45mm offset to an 04 wrx. Please help me out
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Old 07-11-2004, 06:12 PM   #172
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Quote:
Originally posted by Kean
They may use similar offsets, but what about the bolt pattern? I thought most Corvettes were ~5x120 and Porches were usually ~5x130?
Of course an adapter like this H&R spacer would allow different bolt patterns, but would add an inch (25mm) to the offset.
http://www.fiveomotorsport.com/Parts...Spacer5lug.jpg

Another (not easy) option would be to drill and tap the hub (?) for a different bolt pattern. I think this is what Jun did on the Hyper Lemon car. Porsche or VW-type lugbolts or threaded studs could be used. I'd think that the studs would need to be welded in place.

Maybe the VW world (5x100) already makes an adapter for using Porsche wheels (5x130) on a VW?
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Old 07-11-2004, 06:14 PM   #173
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Old 07-11-2004, 06:52 PM   #174
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http://www.jeepsrus.org/tech/WJhubs/5_WJ.jpg

This is what I meant by drilling and tapping the hub for a different bolt pattern.
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Old 07-22-2004, 10:05 AM   #175
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Question

I am new to the WRX and Subaru as well, so please excuse my belaboring this post.
My intention is put 17X17 Subaru 2005 Legacy GT wheels with 225-45X17 tires on my 2004 WRX, and I have selected the 55mm offset (48mm is also avaiiable).
From what I am reading, the 2004 STi 17X7.5 w/ 53mm offset wheels are a direct "good" fit, although I am assuming that those who have done this are also running the 225-45X17 tires and not the 215-45X17's.
With the STi wheels 1/2" wider width minus the 2mm difference in offset, would put the inside edge of the wheel 0.421" closer to the strut. The '05 Legacy 17X7 (55mm) wheel would only be 0.250" closer to the strut than original.
I would appreciate comfirmation that I would still have plenty of clearance to the inside.
Thanks, and I very much appreciate all that I am learning about Subaru's and especially the WRX from all of you at this forum.
Harry
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