Re: GTA wheels

[Simon Favre <simon@domain.elided>]

On the bolt circle, it appears the IAP catalog has thrown us all for
a loop. It wouldn't be the first time a catalog had misinformation in 
it. I would tend to believe they were all 4x108mm until the Alfetta
came along.

On the subject of what wheel fits what car, more confusion results!
I tried a standard set of 14x5.5" Cromodoras from a later GTV or
Spider on my '67 GTV. They did not fit. The problem wasn't the calipers,
it was the steering knuckle. It turns out there were about 4 different
types of hub/knuckle/caliper bracket unit. My car had a 2-piece knuckle
where the caliper bracket was a separate piece held on by 4 large bolts.
This was for the Ate calipers with the small bolt spacing. This knuckle
was only used from late '66 to mid '67. In mid '67, they switched to a
1-piece knuckle and caliper bracket. This had 2 small bolts to hold on
the backing plate, and 2 large ones to hold on the steering arm. This
was also for the Ate caliper with the small bolt spacing. This one was
used through '68. In '69, they came out with the bigger caliper with a
larger bolt spacing, and a different knuckle. This one soldiered on for
many years. Juniors came with a different knuckle that used the smaller
caliper bolt spacing. Before '67, there was another one for the Dunlop
calipers, but I believe most of these have been weeded out of the fleet.

Bottom line, if the suspension parts on your car were designed for a 15"
wheel, you may not be able to fit any 14" wheel. Check it before you buy!
If the car was upgraded at some point to use the 115 series (2 liter)
front suspension, then you should be able to fit either 14" or 15" at will.
IMO, there's no point putting new 14" wheels on anything, because the tire
choices in that size are vanishing.

Simon

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