Will these offsets fit on the front wheels?

[tay10rrr30GTO]

I need to know if these offsets will fit for my front wheels.

The specs are:
18x8 e38/76.1

Is there anyway I could get those to fit? I have a set of rears that I can buy but need a set of front wheels and cannot find them anyone. Thanks for the help.

[Lothar]

Yeah 38 is fine for 8" wheels on the front. You'll want hub rings though.

[tay10rrr30GTO]

Yeah I heard that the GTO has around a 69 hub. I just didn't know if the hub ring would compensate for that.

[My Little GTO]

They should fit. They will be pushed out about 10mm further than your stockers. GTO hub size is 69.5mm FYI.. I also recommend hub rings for the fronts. It doesn't seem to make much of a difference on the backs...

[tay10rrr30GTO]

Where exactly can I buy the hub rings? Also, what would happen if I didn't? Vibration?

[My Little GTO]

Skulte Performance is where I got mine. I heard he was phasing out making rings and spacers though. Jamesbiz at Billet Prototypes may be able to help you as well. BP is a vender on this forum as well.

And yes you will more than likely feel a vibration at certain speeds without hubrings. I haven't had any personal experience regarding this because I needed spacers and had hubcentric rings built into them. From other posts, it seems there is a high probability of a vibration without them.

[tay10rrr30GTO]

Thanks for the information. Are all of the hub rings a certain size? Or do they vary based on what wheel/application?

[My Little GTO]

They are based on wheel application. The inside diameter (I.D.) is the size of the GTO hub. 69.5mm, the outside diameter (O.D) is whatever the inside diameter of your wheel is. In your case, I believe it is 76.1mm if that is what you meant by the OP.

[tay10rrr30GTO]

So the hub rings would have to be 76.1mm? Or could I use the BP 72.5 rings?

[psu goat]

Yeah, a 38mm offset should work in the front, but depending on if your car is lowered and how your alignment is, the tires might come close to rubbing the front fender...but it should be ok.

Hopefully sporaclic will offer his input, as I seem to recall he had some tire rub issues with a 40mm offset with a lowered suspension in front. He also has some wide 245 dunlop z1 star specs though.

So am I safe in assuming that you found someone that is selling the Rota P45F for a bmw hub bore and 5x120 bolt pattern? :)

And to further add to the hub ring questions, I think when CSIJason sold his on here, he actually made them 69.6mm for the inside dimension, to help them go on and off a little easier. I had a set of his for my old wheels and they worked great. Just make sure you put anti-seize on the hub assembly and inside the hub ring itself, so that they come on and off easy (I needed this in my case, since I was swapping wheels for racing and the stock 18's obviously wouldn't fit with the hub rings still on the hub assembly).

[psu goat]

So the hub rings would have to be 76.1mm? Or could I use the BP 72.5 rings?

You couldn't use the BP ones and have them work properly. In other words, if the wheel you're buying has a 76.1mm hub bore, you want a custom made hub ring that would be 76.1mm overall outside diameter, and then the inside diamter would be 69.6mm, to essentially make the aftermarket wheel fit perfectly on the GTO hub.

If you had a 72.5mm outside diameter down to a 69.6mm inside diameter, there would still be ~4mm between the hub ring and the wheel, so the wheel would still be able to move around and not fit hub-centric.

Hopefully that made sense.

Edit: Some people run aftermarket wheels that aren't hub-centric without using hub rings and they have no issues, saying you'll be fine if you torque the lug nuts down in a star pattern, going in increments of say, 30 lb-ft, 60 lb-ft, 90 lb-ft, etc. since this would center the wheel and have even torque on all lugs nuts. Me personally, since I autocross the car, there was no way I was going to do that, because that would probably put more unnecessary forces on the wheel studs and lug nuts during hard cornering. Then I sold my ASA wheels and found some proper hub-centric wheels :)

[tay10rrr30GTO]

psu, thanks. That info helped a lot. I probably will not change my wheels once I have them on... but you never know. I have found a set of rears for the GTO with all the right offsets, and yes the fronts will be a BMW fitment. The fronts are bronze but all the wheels will be getting powder coated flat black once I get them. I might run some 235's in the front if the 245's rub. Hopefully I can get the right hub rings for them. I think the Rota P45r's powder coated black on my IBM will look beyond good. I also plan on adding the Mav. Man CF Lip. I'm on stock suspension right now but may add shocks/struts/springs later.

Thanks for the info!

[r0nd3L]

Motorsport-Tech can make you custom hub rings.

[tay10rrr30GTO]

I wonder how hard it would be to find the hub ring that goes from 76.1 to 69.6?

[tay10rrr30GTO]

Motorsport Tech looks really good. They exact match everything. Thanks again guys.

[psu goat]

psu, thanks. That info helped a lot. I probably will not change my wheels once I have them on... but you never know. I have found a set of rears for the GTO with all the right offsets, and yes the fronts will be a BMW fitment. The fronts are bronze but all the wheels will be getting powder coated flat black once I get them. I might run some 235's in the front if the 245's rub. Hopefully I can get the right hub rings for them. I think the Rota P45r's powder coated black on my IBM will look beyond good. I also plan on adding the Mav. Man CF Lip. I'm on stock suspension right now but may add shocks/struts/springs later.

Thanks for the info!

Awesome! Did you find the P45r's in 18x9.5 with a 50mm offset? If so, I imagine they will have the same issue as the ones that 2FAST4LA sold on here, where you either need to mill the bore of the wheel some for it to fit on the GTO rear hub (making the center cap no longer fit) or run a 3mm spacer in the rear (which allows the center caps to fit).

If you end up needing a 3mm spacer, plan on eventually getting ARP wheel studs for the rear wheels, as my Rota's broke a few of the soft OEM wheel studs, most likely due to launching the car and hard cornering, and I was constantly checking torque specs, so I know that wasn't the problem. Talking to a few of the other Rota P45r owners on here through PM's, I'm not the only one to have this issue.

Edit: Double check on that 69.6mm hub ring measurement before you order them...I was just going off of memory. There should be a thread on here somewhere to confirm.

[tay10rrr30GTO]

Yes, 2FAST is selling me the rears. He says the centers have been machined and he recommends running a 3mm spacer.

And thanks for the info on the wheel studs. I will be sure to look into that.

The GTO hub is 69.5 according to Motorsport Tech. It was defaulted in when I put in my Make/Model. They can do any hub ring you want.

I'm pumped! lol

[psu goat]

Sweet. Be sure to post pics when you get everything sorted out.

If he already machined the rears, I thought you wouldn't need the spacers? With a 50mm offset instead of 47mm, you would get a little more tire clearance and wouldn't need to roll the rear quarter panel lips as much, if at all.

[tay10rrr30GTO]

Well I e-mailed the other seller about the front wheels so I will probably receive that e-mail back tomorrow. Once he says they are in stock and gives me the price I will order everything. I update this as it goes. I can't imagine how good this is going to look :turbonaug