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Old 08-03-2005, 11:42 AM   #1
WRX-ERROR
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Default 52mm Offset on stock WRX?

Construction Type Size Bolt Pattern Offset
One piece cast 17x7.5 5x100 +52mm

Will these fit on a stock WRX? Not sure about the 52mm offset.
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Old 08-03-2005, 11:56 AM   #2
Samirr76
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Thats actually very close to ideal.
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Old 08-03-2005, 12:59 PM   #3
SeattleWRX
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Ask Luke @ Tirerack. He's the offset specialist.

Last edited by SeattleWRX; 08-03-2005 at 01:13 PM.
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Old 08-03-2005, 01:01 PM   #4
handbuiltITR
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Luke@Tirerack = offset police

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Old 08-03-2005, 01:28 PM   #5
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What kind of wheels are they? Just curious, ya know!!
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Old 08-04-2005, 08:57 AM   #6
dbrier
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Those would be perfect. Since the 04 STi is 17X7.5 with a 53mm offset, you can't get much better. What is 1mm among freinds?

Did you know your stock wheels have 55mm offset?
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Old 08-04-2005, 10:49 AM   #7
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Quote:
Originally Posted by dbrier
Did you know your stock wheels have 55mm offset?
But are also only 6.5" wide. For gain in width to keep the wheel centered over the hub, you must decrease offset to compensate.

A good 7.5" wide wheel should be around 47 to 50 offset.

Please veiw the stickied Offset Information Thread at the top of this forum: http://forums.nasioc.com/forums/showthread.php?t=335263

That said, depending on the tire that's mounted to the wheel, it still could be fine (thinner tires would help not have rub on the strut), as the tire would be located farther in the wheel well than optimal.

--kC
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Old 08-04-2005, 02:02 PM   #8
ripvw
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Quote:
Originally Posted by KC
...For gain in width to keep the wheel centered over the hub, you must decrease offset to compensate.
hmm...I've seen this posted before - most conspicuously in the Offset Information Thread sticky - and I think it is wrong no matter where it appears and who quotes it. something like this was thrown out as a theory some time ago and effectively shot down - IMO - by subysouth in this thread:

http://forums.nasioc.com/forums/show...ghlight=offset

to cut to the chase, the "ideal" offset for a Subaru Impreza is the stock offset of ET55. That offset will have the least negative impact on the wheel bearings and steering linkages and will maintiain the suspension geometry as Subaru engineers intended. Unfortunately, maintaining that offset with wider wheels and tires will likely cause rubbing on the struts, so even Subaru is forced to sometimes go to a lower offset wheel for clearance sake. some Subaru OEM wheels offsets for the Impreza include:

Subaru BBS 17 x 7" wheels 55mm
OEM UK Subaru 17 x 7 wheels 53mm
JDM STI Rays wheels 17 x 7.5" 53mm
'04 USDM STI BBS wheels 17x7.5 53mm
'05 USDM STI BBS wheels 17x8 53mm

nothing less than ET53 - why bother to stay so close to the ET55 standard if there was no benefit to be gained? why isn't Subaru taking advantage of the "benefit" of keeping the wheel centered over the hub and lowering offsets to the range KC specifies above when increasing wheel width?

there are of course plenty of aftermarket wheels that also stay close to the ET55 standard, including 17x7 ET52, 18x7.5 ET53, and 18x8 ET51 Prodrives and 18x8 ET51 OZ's

I do understand the benefit of lowering the offset to gain strut clearance, and the side benefit of effectively increasing the track width by running lower offsets - good for racers - I run ET48 myself on 17x7.5 wheels. but there is no benefit from "keeping the wheel centered on the hub" nor any hard and fast rule that offset has to decrease with wheel width other than the practical issue of maintaining strut clearance. Another reason that offsets are lowered is to help with clearance of the huge Brembo calipers found on the STI, but those ET43 offsets are not ideal from a wheel bearing point of view and are usually just the result of adapting a non-Subaru specific wheel to the task

sad to say, a lot of the info in the Offset sticky is plain wrong. from a visual point of view, the best way to understand the necessary tradeoffs between strut and fender clearance is the diagram that Jon Bogert created and I copied into the Offset sticky:

Quote:
Originally Posted by Jon Bogert
This'll give you an idea of relative position on an '04 STI. I put this together when shopping for wheels:

So I agree with Samir in stating that the 17x7.5 ET52 wheels that WRX-ERROR has found are indeed close to ideal...
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Old 08-11-2005, 10:42 AM   #9
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Quote:
Originally Posted by ripvw
hmm...I've seen this posted before - most conspicuously in the Offset Information Thread sticky - and I think it is wrong no matter where it appears and who quotes it. something like this was thrown out as a theory some time ago and effectively shot down - IMO - by subysouth in this thread:

http://forums.nasioc.com/forums/show...ghlight=offset

to cut to the chase, the "ideal" offset for a Subaru Impreza is the stock offset of ET55. That offset will have the least negative impact on the wheel bearings and steering linkages and will maintiain the suspension geometry as Subaru engineers intended. Unfortunately, maintaining that offset with wider wheels and tires will likely cause rubbing on the struts, so even Subaru is forced to sometimes go to a lower offset wheel for clearance sake. some Subaru OEM wheels offsets for the Impreza include:

Subaru BBS 17 x 7" wheels 55mm
OEM UK Subaru 17 x 7 wheels 53mm
JDM STI Rays wheels 17 x 7.5" 53mm
'04 USDM STI BBS wheels 17x7.5 53mm
'05 USDM STI BBS wheels 17x8 53mm

nothing less than ET53 - why bother to stay so close to the ET55 standard if there was no benefit to be gained? why isn't Subaru taking advantage of the "benefit" of keeping the wheel centered over the hub and lowering offsets to the range KC specifies above when increasing wheel width?

there are of course plenty of aftermarket wheels that also stay close to the ET55 standard, including 17x7 ET52, 18x7.5 ET53, and 18x8 ET51 Prodrives and 18x8 ET51 OZ's

I do understand the benefit of lowering the offset to gain strut clearance, and the side benefit of effectively increasing the track width by running lower offsets - good for racers - I run ET48 myself on 17x7.5 wheels. but there is no benefit from "keeping the wheel centered on the hub" nor any hard and fast rule that offset has to decrease with wheel width other than the practical issue of maintaining strut clearance. Another reason that offsets are lowered is to help with clearance of the huge Brembo calipers found on the STI, but those ET43 offsets are not ideal from a wheel bearing point of view and are usually just the result of adapting a non-Subaru specific wheel to the task

sad to say, a lot of the info in the Offset sticky is plain wrong. from a visual point of view, the best way to understand the necessary tradeoffs between strut and fender clearance is the diagram that Jon Bogert created and I copied into the Offset sticky:



So I agree with Samir in stating that the 17x7.5 ET52 wheels that WRX-ERROR has found are indeed close to ideal...
And I also said:

Quote:
Originally Posted by kc
That said, depending on the tire that's mounted to the wheel, it still could be fine (thinner tires would help not have rub on the strut), as the tire would be located farther in the wheel well than optimal.
What that pic above doesn't show is the strut relative to the wheel... and the issue isn't the wheel believe it or not... (small part is for bearing longevity.. pushing the wheel away from center over the hub withh wear down the bearings.) it comes down to tires that are on the wheel. If you are going to run wider wheels, chances are very good you're going to be running some pretty good rubber on it.

There are 245 tires that run much wider than other 245 tires (Falken azenis for example are almost like 265s). If you're running an offset that has the inboard side of the wheel closer to the strut than stock, odds are VERY good that you'll have rubbing on the strut unless you put something like 215s on your 8" wide rim...(honeslty.. what's the point of THAT?) whereas you could run a +48 or lower offset and negate the rubbing on the strut.

You also run into this issue when you lower the car... offset actually becomes much more critical with some suspensions with adjustable ride height coilovers (some have a wider shock body than others).

I can tell you this, 245/45-16 Falken GRB451s on +45 offset 16"x8" rims only had 5mm of clearance to stock struts. If I was running any wheel with an offset greater than 48, odds are very good with deflecton of the tire, that I'd be rubbing the hell out of the struts.

It's not a cut and dry issue of 'it fits so it works'. There's just a bit more than that to it. Tire selection plays a fairly big role in the whole thing as it's not the wheel that rubs.. but the tire. The wheel is what pulls the tire away from the strut.

--kC
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