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Old 10-26-2001, 01:59 PM   #1
turbocharged
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Default What a Subaru Tech at the dealer told me about 18's

I know very well that therre are all kinds of people on this forum who have put 18 inch rims on their WRX's with various tire configs, but when I told the tech at the dealer today that I was going to put 18's on my car He got down on one knee right next to the rear tire and told me to feel inside the wheel well where the bottom of the plate that the spring rests on it.

Between that plate (Sorry I don't know the formal name for this thing.) and my stock tires there was no more that a single inch in clearance. He tokd me they won't fit, and that jus the other day a guy with 18's konig tantrums and 40s tires came in because that plate I am talking about had carved a groove in both rear tires from rubbing during an Auto X. ***?

He told me that the only way that 18s would work is with 35s tires and even they that they will rub. I am totally familiar with the whole +2 rim -2 tire sizing scheme. And mainly I just think that this guy is full of ****. Is there any truth to what this guy is saying.

Have you guys with 18's ever had interferance with that plate thing I am talking about. Because whether is was blowing it out his butt or not, there really isn't much clearance between the plate and the stock tire.

I don't think that it should matter, and plenty of people on this board have gone with the 18s. I guess all I want to know is whether or not there are some wheel and tire combos that have caused some rubbing? Alright Cool.


Thanks.
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Old 10-26-2001, 02:13 PM   #2
mrbell
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well... 18's, in and of themselves doesn't not mean that there will be any changes to the outer diameter of the tire, nor the width of the tires, so it is possible to put 18's on your car and have them work w/o rubbing.... however... usually 18's are wider, so you may have problems w/ that, also, if you don't get tires that are low enough profile to keep the same rolling radius, you will hit the spring perch(the piece I believe you are talking about... he's right about 35 series maybe being the only way to go, you'll have to calculate the rolling radius of your tire, and of the wheel/tire combo you want to put on, and see if there's a difference, if not, you should be fine... but 18's are pretty big anyway... I think 17's are probably what you really want if you're going to drive this car on real roads..
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Old 10-26-2001, 02:19 PM   #3
nhluhr
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Quote:
Originally posted by mrbell
you'll have to calculate the rolling radius of your tire, and of the wheel/tire combo you want to put on, and see if there's a difference, if not, you should be fine... but 18's are pretty big anyway... I think 17's are probably what you really want if you're going to drive this car on real roads..
here's all the size combinations with the outer diameter calculated:

Width Aspect Wheel Diameter
205 55 16 24.87795276
215 50 16 24.46456693
225 50 16 24.85826772
225 45 16 23.97244094
235 45 16 24.32677165
245 40 16 23.71653543
245 45 16 24.68110236
215 40 17 23.77165354
215 45 17 24.61811024
225 35 17 23.2007874
225 40 17 24.08661417
225 45 17 24.97244094
235 35 17 23.47637795
235 40 17 24.4015748
235 45 17 25.32677165
245 35 17 23.7519685
245 40 17 24.71653543
225 30 18 23.31496063
225 35 18 24.2007874
225 40 18 25.08661417
235 35 18 24.47637795
235 40 18 25.4015748
245 35 18 24.7519685
245 40 18 25.71653543
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Old 10-26-2001, 03:00 PM   #4
jim-bob
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i was under the impression that prodrive recommended 18" P1s for the new age impreza. i've been wrong before, though...
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Old 10-26-2001, 03:01 PM   #5
Luke@tirerack
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The main problem with what the tech told you is ... that he doesn't know anything about wheels and wheel configuration (the guy with the Konigs didn't eihter) If the wheel tire combination has the correct offset and proper diameter it will not cause any rubbing issues. There are some wheels that have a correct offset but, there design does not offer proper clearances in critical areas (i.e. brakes, suspension, etc.)

The proper 18" tire size for a WRX is 225/40-18


Luke
877-522-8473 ext. 362
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Old 10-26-2001, 03:02 PM   #6
DLC
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Coilovers fix the spring-perch problem
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Old 10-26-2001, 03:33 PM   #7
kastle
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As Luke pointed out..... the Konig's aren't the right offset for a Subaru.... the person who had them on and the mechanic are morons for suggesting just because you are putting on 18's they won't fit..... I just love people....
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Old 10-26-2001, 06:11 PM   #8
NotoriousWRX
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Just goes to show that dealer mechanics don't know their a$$ from their elbow when it comes to doing anything to a car that is not in their OEM manuals.

Again, I will repeat my advice to live by when it comes to the dealer service departments. Stay away unless you're getting free parts and labor under warranty. (I wouldn't even let them change my oil)
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Old 10-26-2001, 06:56 PM   #9
hkwan
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These dealers, they should shut the heck up if they don't have any constructive contribution. Luke has pointed out, if you have the correct offset, you will be OK. For 225/40-18, the overall diameter of the wheel is about 0.4% bigger than stock and the offset should be 48+ or higher.
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Old 10-27-2001, 09:58 AM   #10
rsr911
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I got my 18" wheels from Mike Shields at SPD because Luke at Tire Rack did not carry them.
I got my tires from Luke and he helped me install them. Thanks again Luke. The wheel offset is 48mm
as it should be for an 18 x 7.5" rim for a Subaru.
I have run a full track event and 1 auto cross.
NO RUBBING!

So there you go.

Owen
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Old 10-27-2001, 10:42 AM   #11
ANZAC_1915
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I think 48mm is less than optimal (perhaps why Luke doesn't sell them). Something in the 52-55 range is better. I forget what the P1's are.
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Old 10-27-2001, 11:38 AM   #12
rsr911
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Glenn,

48mm on an 18" X7.5 is fine. Luke does not carry
Speedline GT1s which is what I got. They actually come from Scooby Sport it is what Pete Crowley has on his own car.

By the way how are you doing after your shunt? I hope you are well. How is the car?

All the best.

Owen
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