[patox]

HI everyone... trust me I searched and read a lot and found no helpful info so far...

I have a 66 GTO bone stock besides son aftermarket disk brakes front and rear (originally drums at the four corners).
My original 14" Rallye I´s are showing its age and finding tires is getting harder every day, so based on reviews here and other places I bought a set of WV 15x8 for my car.

In the front I have some inline tube (I guess) disk kit and the wheels worked like a charm, 225/60/15 BF's looks pretty good.
On the rear I had '00 2wd blazer disks, dual pistons with parking brake that fitted under my 14" Rallye just with spacers, and longer bolts and I liked neither of them!, so I moved to the mentioned 15".

Long story short... they didnt fit! OK my fault, blazer brakes, not the standard, instead of blaming the wheels, I bought new brakes... inline tube again, simple, cheaper kit for a 66 GTO, with parking brake on the caliper (which I dont like!) and guess what... they WONT fit either!!!

The kit is supposed to work on "most 14" and all 15", but it seems it won’t work on my brakes, and using the hated spacer will put the 245/60/15 rubbing against the lip of the fender.
So now, after buying new brakes, now I cannot use the car.

Have anyone used those WV with rear disks? I tried grinding the caliper a bit... didnt work, I dont want to roll the fenders, what are my options? 15x7? is there other offset I can use?
Really need some help here... this wheel thing is frustrating me...

Thanks

[ZeGermanHam]

What diameter rotors are you using in the rear?

[chrisp]

What is the backspacing of the wheel you are using ?

[patox]

The kit does not mention the rotor size, but heres the link.
https://cgi.ebay.com/ws/eBayISAPI.dl...=2009863668008

The wheel is 5" bakcspace... this one
https://www.summitracing.com/parts/WVI-59-583405

Thanks

[ZeGermanHam]

Your eBay link doesn't work for me (just goes to a login page), but based on the wheels you linked to, I think your problem may be due to the backspacing being too high. I'll defer to the pros here, but in my experience, a backspacing of 4.25" to 4.5" is where you need to be, not 5" as is the case with your current wheels.

[patox]

Maybe this one will work?
https://www.ebay.com/itm/1964-77-A-G...S/181987592334

I kind of assumed that WV knew their job... and offered the wheels on the best most comon fitting sizes... just trusted them!

[ZeGermanHam]

I wouldn't be so quick to blame Wheel Vintiques, or anyone else for that matter. They don't know what brakes or tires you're going to use. None of the parts you are working with here are original equipment to your car. Said another way, it's all custom fitment and getting it right requires a solid amount of homework.

To narrow in on the backspacing issue, would the wheels fit over the brakes if they were 0.5" to 0.75" further outboard from where they are currently? I know that won't fit with your 245 tires, but I'm just thinking about wheel & brake fitment at this stage.

[66sprint6]

I don't even know how you guys get 8's to fit anyways. I've got 7's and they just fit on my '66. I guess that tire size makes the difference. I don't have disc brakes, but I'm thinking that the offset required for the 8's to fit inside the wheel well pushed the smaller (diameter) part of the rim into the calliper.

[b-man]

In order to tuck an 8” wide wheel inside the confines of the rear wheel well on these cars a 5” backspace is pretty much the minimum needed. If you really get inside there and take some measurements you’ll see that even as much as 5.5” may be required if you’re really set on putting the widest tire possible on that 8” wheel such as a 275/60-15. Centering the wheels from side to side is a must, often a custom backspace must be specified.

With that said, before buying any disc brake setup, either front or rear, you must do as much homework as possible to be reasonably (or best absolutely) sure that the wheels you’re using will clear the brake calipers. The better suppliers of disc brake kits will have templates available to check for caliper clearance.

When I was installing C6 Corvette Z06 brakes on my ‘64 Tempest the company I was dealing with (KORE3) had a selection of different brake profile templates available to download and print out, you glued the paper templates to a thin sturdy piece of cardboard and inserted them inside your wheels to check for fit. In my case 18” wheels at minimum were needed because of the size of the brake rotors/calipers (14”/6-piston & 13.4”/4-piston) and not just any 18” wheel would have the needed clearance, the spoke design had to have the right inside profile in order to work.

Unfortunately you might find that you’re going to have to skip running rear discs altogether to use a 15x8” wheel with enough backspace to tuck in the tires for a good fit. There are big 11” rear drum brakes which came on station wagons that are a nice inexpensive bolt-on upgrade.

Maybe a smaller diameter disc brake rotor that moves the caliper down enough might do the trick, if 11” rotors won’t work perhaps there’s a 10” or 10.5” setup that will. Good luck.

[Scarebird]

We have a bracket that should work - it uses the 82-87 F rear disc and the Eldo caliper. It fits most 14's we have seen.

[ZeGermanHam]

Originally Posted by 66sprint6

I don't even know how you guys get 8's to fit anyways. I've got 7's and they just fit on my '66. I guess that tire size makes the difference. I don't have disc brakes, but I'm thinking that the offset required for the 8's to fit inside the wheel well pushed the smaller (diameter) part of the rim into the caliper.

That's my suspicion as well. 15x7" wheels with 4.25" backspacing likely would fit over his calipers because the wheel wouldn't be so far inboard. Personally, I'd keep the brakes and go with 15x7" wheels and 235/60R15 tires. You only give up a small amount of tire width and there shouldn't be any conflicts with the disc brakes.

[gtospieg]

b-man is correct...My 67 GTO required a 5.5" backspace for the 17x8 wheels and 255/45 17 tires with Baer 12" rotors on all 4 corners. No rubbing anywhere front or rear.

[ZeGermanHam]

Originally Posted by gtospieg

b-man is correct...My 67 GTO required a 5.5" backspace for the 17x8 wheels and 255/45 17 tires with Baer 12" rotors on all 4 corners. No rubbing anywhere front or rear.

I don't think anyone would question a 12" rotor setup in a 17" wheel, as there would be acres of space.

[gtospieg]

Z...I was referring more to the backspace required for the 8" wheels to fit...

[ZeGermanHam]

Originally Posted by gtospieg

Z...I was referring more to the backspace required for the 8" wheels to fit...

I understand that, but your comparison in reference to backspacing is not apples-to-apples here because of the different wheel diameter involved (17" vs. 15") and the nature of the problem (brake interference).

If OP was running 17" wheels like you, he wouldn't have a brake fitment issue either, even with backspacing over 5". Alas, he is running 15" wheels and evidently needs backspacing closer to 4.25"-4.5" so that the brakes clear, but that also means he needs narrower wheels & tires so the tire doesn't rub the wheel arch.

[66sprint6]

I've got 255/60/15's on the 7's, in the picture that I posted earlier.

[patox]

Originally Posted by 66sprint6

I've got 255/60/15's on the 7's, in the picture that I posted earlier.

It looks pretty good on that pic!
How would you guys feel about putting 15x8 up front and 15x7 in the rears?
Will they look funny considering the tires will be wider in the rear anyway?

[gassman_67]

I had the same problem, I have the rally 1 15x8 for the back and 15x7 for the front The 15x8 have a 5" backspace and would not clear the Wilwood calipers I have on my QP 9", I swapped the 15x7 to the back, and the fit fine! The 15x7 have a 4.25" backspace. The 15x8's fit fine over my Right Stuff setup.

[patox]

Originally Posted by gassman_67

I had the same problem, I have the rally 1 15x8 for the back and 15x7 for the front The 15x8 have a 5" backspace and would not clear the Wilwood calipers I have on my QP 9", I swapped the 15x7 to the back, and the fit fine! The 15x7 have a 4.25" backspace. The 15x8's fit fine over my Right Stuff setup.

Any pic on that setup? Wondering how a 7" in the rear and 8 at front might look

[gassman_67]

Originally Posted by patox

Any pic on that setup? Wondering how a 7" in the rear and 8 at front might look

Sorry, the car is not quite together.