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Old 01-02-2006, 09:53 PM   #1
Ohannon7
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Default 7.5" wide rim w/ +42 offset, 05WRX ok?

Who's done it, how long, did your wheel bearings go out, did your car blow up, etc. etc.

Ive read a bunch of different things so far. Thanks

p.s. lookin at 18" now, dont think that makes a difference though
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Last edited by Ohannon7; 01-02-2006 at 10:10 PM.
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Old 01-03-2006, 11:29 AM   #2
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Look at the top of the forum with different STICKIES....
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Old 01-03-2006, 11:39 AM   #3
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They are not going to be the best for your bearings, but running those daily will be better than autoxing your car regularaly on stoc wheels. By the time I get my spacers in for autox I will be running the equivalent of +38/43 front and +48 rear.
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Old 01-03-2006, 12:14 PM   #4
Ohannon7
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Quote:
Originally Posted by sube-trex
Look at the top of the forum with different STICKIES....
I read that and it says its a no go, but I know there are many people out there that dont run those exact offsets b/c there is a limited selction of wheels w/ those offsets.

Im guessing worse case scenario I have to replace the wheel bearings after a year or two, how much is that, anyone know???
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Old 01-03-2006, 12:17 PM   #5
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Quote:
Originally Posted by Ohannon7
I read that and it says its a no go, but I know there are many people out there that dont run those exact offsets b/c there is a limited selction of wheels w/ those offsets.

Im guessing worse case scenario I have to replace the wheel bearings after a year or two, how much is that, anyone know???
If you have the tools and do it yourself it is cheap ~ $30 per axle. If not, the dealer charges like 350 or so per axle. If you do not have the means to replace bearings then get something more bearing friendly.
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Old 01-03-2006, 12:33 PM   #6
Ohannon7
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Quote:
Originally Posted by subieworx
If you have the tools and do it yourself it is cheap ~ $30 per axle. If not, the dealer charges like 350 or so per axle. If you do not have the means to replace bearings then get something more bearing friendly.
Hmmm, ive done brake jobs and packed bearings b4 but not too sure if its different on the WRX, any insight
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Old 01-03-2006, 12:43 PM   #7
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There is a lot of work involved. And if you don't have a press I wouldn't bother. It's not difficult to do assuming you have the correct tools and knowledge.
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Old 01-03-2006, 09:30 PM   #8
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I ran those wheels on my car for almost three years no problems.
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Old 01-03-2006, 09:45 PM   #9
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Quote:
Originally Posted by Clzay
I ran those wheels on my car for almost three years no problems.

hahahahahahahahaha, you got me
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Old 01-03-2006, 10:03 PM   #10
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Everyone mentions "Wheel bearings" whenever someone talks about running an incorrect offset. That's true, but it's only part of the equation. By running such an incorrect-offset wheel, your steering geometry is really screwed up. The steering wheel will tug and pull more on surface irregularities, steering feel will be messed up, torque steer will be amplified...

Of course, all that is subjective and might not actually affect performance. But it seems like a big deal to me.

_Jeff
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Old 01-04-2006, 07:56 AM   #11
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It also increases track width and can thereby increase overall grip.
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Old 01-04-2006, 12:34 PM   #12
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I've been running 17x8 with a +40 offset for a little 1.5 years now (almost 30k miles). I have had no wheel bearing problems. However, I would pay attention to the advice given by Jeff (Portly). +40 may look fine (no rubbing, fit flush, etc.), but they are not the better choice for performance. I would suggest sticking with a wheel that is closer to the stock offset. .....regardless of wheel bearing concerns.
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Old 01-04-2006, 12:35 PM   #13
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I've been running 17x8 with a +40 offset for a little 1.5 years now (almost 30k miles). I have had no wheel bearing problems. However, I would pay attention to the advice given by Jeff (Portly). +40 may look fine (no rubbing, fit flush, etc.), but they are not the better choice for performance. I would suggest sticking with a wheel that is closer to the stock offset. .....even if the wheel bearings were of no concern.
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Old 01-05-2006, 01:55 AM   #14
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05 wrx, 7.5 wide with 53 offset. Now this is a safe setup
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Old 01-05-2006, 02:33 AM   #15
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Quote:
Originally Posted by subieworx
It also increases track width and can thereby increase overall grip.
My understanding of wheel offset and suspension geometry would suggest that your statement is not correct. The farther out from the ideal offset you move the centerline of the tire/wheel the the less traction you will have. Even though you will have a wider track, your suspension/steering which is designed for an offset of +53 will now be rotating the tire inside of the centerline of the tire/wheel. Consequently there will be more scrub on the inside of the tire, and the outside of the tire won't touch the road under hard cornering.

This is kinda hard to visualize but consider this... With the proper offset when you turn your steering wheel the suspension geometry causes the tire/wheel to rotate flat around the contact patch of the tire (the contact patch is where the tire touches the ground across the full width of the tire), keeping the whole contact patch of the tire in contact with the ground throughout the suspension's travel (up and down). Now if you move the center of the contact patch away from the centerline of the suspension geometry (castor and camber will no longer keep the contact patch flat), the whole contact patch of the tire will no longer be in contact with the ground so you will loose traction, you won't have as much tire touching the ground as you would with the centerline of the tire/wheel at the ideal point (offset) of the suspension geometry.

It is my understanding that if you move the offset + or - more than 5mm you will adversely affect the performance of your suspension, and will cause premature wheel bearing failure.

Rocket's two cents...
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Old 01-05-2006, 08:20 AM   #16
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What you say makes sense when the car is moving in a straight line. But as soon as you enter a turn the weight of the car is going to spread the load across the tires more evenly. At that point having a wider track and help overall grip. There is a trick that has been done by autoxers for a while where they utilize a lower offset wheel/wider tire up front in order to increase front grip enabling better rotation in corners. And if you look at most of the road race guys in Subarus most of them are running in the neighborhood of 9" wide wheels with a 35mm offset or less. Check out Luke Russels 1 Lap setup for this year. he is considering somewhere in that area.
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Old 01-05-2006, 11:16 AM   #17
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…from personal experience, I did notice subtle (negative) characteristics under certain circumstances that are probably attributable to the 13mm (1/2”) variance of my wheels. However, tire wear and general drivability has been fine. Of course, hindsight is 20/20 and if I had it to do all over again, I would have searched harder (or waited) for a 17x8 in the proper offset. Although I experienced a noticeable gain in handling, I believe the overall benefits would have been greater with the right wheels.

btw, I have a hard time believing that a 5mm (~ 3/16”) difference would adversely affect performance. With such a minute variance, I’m sure it would have a negligible impact in most cases.
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