wheels

[Avanti 67]

does anyone know the correct bolt hole pattern for a 1967 Avanti II. I had the tire shop measure the rim but the rims on the car were "multi-fit" rims and the bolt hole pattern could be 5 on 5, 5 on 4.5 or 5 on 4.75.

we are leaning to 5 on 4.75 but looking for confirmation.

doug

RQA0239

[Gunslinger]

The bolt circle is 5 x 4 1/2". It stayed that way until they went to a GM platform in the mid-1980's. As long as the car is on the original Stude design chassis it has a 4 1/2" bolt circle...same as Ford, Mopar and American Motors of the same era.

[Ray K.]

I recently replaced the wheels on my 82 Avanti (RQB3420) with 5 x 4 1/2 bolt pattern wheels from a Mopar. However, the center hole on the Mopar wheels is 2 13/16, whereas the Avanti hub diameter is 2 7/16. I have been told that the wheel bolts are there to hold the wheel to the hub, and are not designed to support the weight of the vehicle. Vehicle weight is supposed to be supported by the center hub (end of the axle that pokes through the center hole of the wheel). Evidently, after-market wheels with too-large center holes have been used without incident, but I doubt that the government or insurance companies are keeping any statistics on wheel failure from this source. According to the website :

http://www.carbibles.com/tyre_bible_pg2.html

a spacer ring should be placed between the hub and wheel. I have been unsuccessful in locating spacer rings for this purpose. Does anyone know where such rings are available?

[WayneC]

According to the website :

http://www.carbibles.com/tyre_bible_pg2.html

a spacer ring should be placed between the hub and wheel. I have been unsuccessful in locating spacer rings for this purpose. Does anyone know where such rings are available?

I haven't used them, but Google is your friend; try searching on "hubcentric rings"

... here are a couple of hits, but you need to take your measurements in millimeters:

http://www.1010tires.com/hubrings.asp

http://tinyurl.com/22ryen

http://tinyurl.com/28leea

Here's a table for converting inches to mm: http://tinyurl.com/37bw79

My guess is that if the wheels do not use a centering-type lugnut, eg, if the lugnuts

for alloy wheels are not the tapered type that center the wheel holes on the studs

(the old steel wheels used an "acorn" style nut in a wheel hole designed for them),

but rather just clamp down on the outer face of the wheel, then you probably need

a hubcentric spacer ring.

Be aware that some alloy wheels may need to have the center hole enlarged (machined)

to fit over your hub.