Re: identifying 105 rotors

["John Hertzman" <johnhertzman@domain.elided>]

Phil Gicante asked: "The 1300 of my '70GTJr was replaced by one of the
previous owners with a 1750. However, I know that the rotors and other front
brake hardware changed between the models/years, and I'm not sure which one is
one my car. How can one identify without doing a side-by-side comparision?
Currently the RHS rotors are left-hand thread and the front calipers are
ATE."

John Basel, responding, wrote "As I understand it, the early cars (up to 67?)
used rotors with left hand threads on the left hand side of the car and right
hand threads on the right hand side.  Later cars used right hand threads on
both sides.  I've heard that the later Juniors such as yours continued use of
the early style front suspension (and rotors?)"

It is a bit more complicated than that, and I'm not sure about an answer to
Phil's original question. The left-hand/right-hand threads were continued
through the last of the 1750s and the concurrent Juniors; uniform threading
came in with the lugnut-secured hubcaps used on the 2000 and the concurrent
Junior 1.3 and Junior 1.6 cars (Junior 1.3 being distinct from 1300 Junior,
etc.) and with the different lugnuts used with the Turbina alloys. (The rarer
Fergat alloys offered for the 1750 had their own distinct lugnuts.)

Suspensions? Harder to pin down, at least for me, too many break-points. But
the 1750 and 2000 spindles and calipers were identical, all 1300 and 1600
variants (except the early Dunlop cars) a different identical set.

Rotors? I'm fairly sure that the 1750 and 2000 rotors were identical except
for the lugbolts, but I know no reason the 1972-up lugbolts can't be used in
any earlier rotors, so handedness proves nothing. (I've considered
retrofitting the ambidextrous lugs and early bronze lugnuts to a later car-
perverse personal preference, they were a part of what I first admired in
Alfismo.)

If somebody else has a good answer for Phil Gicante's question, I hope they
have passed it on, or will, but the presence or absence of lefthanded threads
isn't it. In his case I would resort to doing his last resort, a side-by-side
comparison.

John H.
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