66 GTO Rear Wheel and Tire Fitment - pricing too

[old66tiger]

I am measuring up for new rims and tires for my 66 GTO and have a question. Looking from the side of the car and picturing the hands of the clock (3, 6, 9 and 12), using a straight edge on the flange of the axle, I measure the closest interferance on the inboard and outboard side of the wheel well.

Starting at 12:00 position the closest inboard side interference is 7" and the closest outboard side interference is 4.6" for a total width of about 11.6"

Also, the wheel well has some interesting contours on the rear most portion of the inboard side of the wheel well. At the 3:00 position, here are the following inboard measurements:



At 13.25 from center of the axle: 6.3"
at 12.25 from center of the axle: 6.6"
at 11.25 from center of the axle: 6.8"

If I am thinking straight, the most critical measurement at this location is the 11.3" as this would be at the max cross section of the tire which should occur at 11.25". The 10.8" would be at the tread of the tire at 13.25".


Is it reasonable to fit a 9" rim in here?


I got a great deal on a set of Billet Specialties Daggers at the Good Guys show from Billet Specialties (direct). I haven't paid for them but they guaranteed the pricing for as long as it takes to get the brakes on the car for final measurements. I would also be interested in entertaining wheel and tire packages from other vendors as long as the pricing is competitive

[muthstryker]

Should beable to fit a 10in wide wheel in there. With a 285 or 295 if you roll the fender lips. Im sure Jon from driverz inc will chime in but a 9in should be fine.

[old66tiger]

I don't think it is possible to roll the fender lips. The wheel well is a bit narrower than the pinch weld.

[JT_67Tempest]

I don't think it is possible to roll the fender lips. The wheel well is a bit narrower than the pinch weld.

I am running a 20x10 wheel in the rear. For the part of the wheel well that you describe that is narrower, I actually trimmed that piece of the inner wheel that you described so I could run the wider 10" wheel.

Wheel specs are:
19x8, 5.5" backspace with 1.5" caliper clearance to clear his brakes and center hub length.

20x10, 6.375" backspace, with only a .50" pad to help with wheel depth with that backspace.


Here's a picture of the car.

[DriverzInc]

Yeah, we normally fit 10s in the rear of the 66-67 A-bodies with either a 275, or 285 wide tire. The inner fender well is the most critical part of the rear fitment, and ride height will make a difference. 9's are a slam dunk.

We'll match whatever Billet Specialites quoted you on the wheels, if you buy a wheel and tire package from us. This way we can mount, balance, and ship the wheels complete with tires and ready to bolt on for you. I'm sure this would be cheaper and easier for you in the long run.

We're in the process of moving, but give me a call Monday if you like, and we'll get you all settled.

[69CamaroPT]

I'd talk to Frank at Prodigy. I have a 67 convertible that we are working on and only a 9" will go with no modifications. We are running a 275/40/19 out back. We had previously ordered a 10" and it was a no go with with a 285/35/19.