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Old 09-23-2022, 08:35 AM   #1
240whpWRX
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Default Questions about 18x8.5s on Bugeye

Hey everyone

I've been in the market for new rims for a LONG while now. My Bugeye still has these awful and ugly 17x7.5 rims since I got the car and I just haven't upgraded yet for various reasons.

I decided to go 18x8 as I like the 18 inch look.

However, in my country (NZ) specifically, it is hard to find 18x8s with the design I want.

I'm after a nice concave (not insanely concave), with the smaller spoke design.

Kudos Tokyo are my favourite wheel as an example of the style I like.

Anyway, I have not upgraded as I:

1. Can't seem to find a wheel I want in the right size, width, offset, stud pattern and color.

2. Am a bit stuck on how big I can go, in regards to rubbing, clearance, etc etc.

So, I was wondering if I can go 18x8.5 on a Bugeye without modding, or with minimal modding?

I'm on stock ride height currently.

Also, I've been adverse to going TOO big or TOO wide because I kept hearing about performance loss due to heavier rims/tyres and a greater rotating mass.

How much of a performance difference would 18x8.5 be compared to 17x7.5?

Cheers!
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Old 09-23-2022, 10:10 AM   #2
K3rm1tth3fr0g
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Get 17x8s

Thank me later
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Old 09-23-2022, 02:03 PM   #3
umscooby
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Without knowing the offset of teh 18x8.5's noone can answer this question. Yes 18x8.5's can fit, easily with the right offset.

Also, there is a tire and wheel forum here with threads for wheel fitment.
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Old 09-23-2022, 02:03 PM   #4
umscooby
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Was a double post, but since I have the spot I'll be nice for a change.

For 18x8.5 on a GD you are looking for a wheel offset in the range of +35 to +45, so you have some leeway.
Anything over +45 and you may rub on the inside, under +35 you may rub on the outside. This is also dependent on tire size. I'd recommend a 245/40 tire on 8.5's. Those are all conservative numbers.

UM

Last edited by umscooby; 09-23-2022 at 06:00 PM.
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Old 09-24-2022, 01:29 AM   #5
240whpWRX
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Quote:
Originally Posted by umscooby View Post
Without knowing the offset of teh 18x8.5's noone can answer this question. Yes 18x8.5's can fit, easily with the right offset.

Also, there is a tire and wheel forum here with threads for wheel fitment.
Will probably be between 35p and 45p
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Old 09-24-2022, 01:31 AM   #6
240whpWRX
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Quote:
Originally Posted by umscooby View Post
Was a double post, but since I have the spot I'll be nice for a change.

For 18x8.5 on a GD you are looking for a wheel offset in the range of +35 to +45, so you have some leeway.
Anything over +45 and you may rub on the inside, under +35 you may rub on the outside. This is also dependent on tire size. I'd recommend a 245/40 tire on 8.5's. Those are all conservative numbers.

UM
Thanks!!

Will I lose much in terms of performance going from a 7.5 width to an 8.5 width as well as going from 17 to 18 inch?
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Old 09-26-2022, 10:44 AM   #7
Unabomber
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Quote:
Originally Posted by 240whpWRX View Post
Thanks!!

Will I lose much in terms of performance going from a 7.5 width to an 8.5 width as well as going from 17 to 18 inch?
Some, none or a lot...we have no idea. I'd recommend you research this topic and come up with your own answer. Changes to tire diameter cause changes to your apparent final drive which impacts acceleration and driveline wear. Weight changes with tire/wheel setups impact acceleration and unsprung weight which impacts suspension. Width has suspension and fitment impacts.

Cliff Notes: You want wheels that fit over your brakes and within the body restrictions. You want wheels/tires that are as light as possible and suited for your driving conditions. You want smaller diameter wheels and tires for the best performance. If you are concerned about looks, then damn the torpedoes and get you some deuce deuces and wrap them in some Vogues and go about your day.
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Old 09-27-2022, 07:16 PM   #8
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You've gotten a lot of good information so far and most of it is what I was wondering when putting the same size wheels on my GD STi. I know you're looking for WRX information but I can tell you a little about my vehicle which is a GD chassis...I am running GR STi 18x8.5 BBS wheels [+55] with factory size 245/40-18 tires. They do rub a little on the inside with the steering fully locked to either side, nothing that I noticed while driving but I did see rub marks on my liners later. I don't feel like the wheels changed the ride too much but I did have RCE black springs and Whiteline sway bars as well. The speedo is slightly off as someone mentioned...a tire with a shorter side wall closer in height to the factory tires would help but I wanted a taller side wall. I've been running the car this way for several years now. I don't recall thinking acceleration was adversely effected. While you're doing your research I would also roam the forum and reach out to someone you see with a setup similar to what you are trying to do and fire off a PM.
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Old 10-06-2022, 04:52 PM   #9
runner19
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I have the same car as you. I also have four sets of oem rims. All rims have ET 51-55

The oem 2002 17 rim is light and strong. It is the lightest with a road tire

The oem 2011 17 inch rim is 8jj. It is near the strut, in the rear with - 1,2 camber. With the same size tyre (225, It is heavier). I notice it on pull off.

I have Prodrive pff7 (these are light for an oem rim) No clearance issue. Even with a 35 mm drop(Whiteline group 4s)

The other OEM 18 rim does not fit with my 330 brake kit. I need a spacer. And it is HEAVY.

My buddies have copy 18 inch rims with 225/40/18 tyres. They have all broken rims. This resulted in damage. My OEM 17 inch rims are still round. You be the judge. You can paint the OEM 2002 rim anthracite. It looks good on a WR blue car.

I will be getting Bridgestone race and Sport tires soon.

My heaviest 18 rim has 3 kgs more than the lightest 17 inch rim

Last edited by runner19; 10-06-2022 at 04:59 PM.
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