115 wheel studs, and parts-book reprints

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

In AD8-0148 Roy Moreno had posted a question about wheel-mounting studs for
his '85 Spider which he was switching from stock steel wheels to Turbinas. I
missed any on-digest replies, but in AD8-0166 he wrote "Thank you very much to
all who responded to my question regarding lugs on an 85 Graduate fitted
currently with steel wheels waiting for Turbina wheels.  For anyone else's
benefit, the consensus was that the studs with the current lugs will be
functional with regards to having enough thread and working well, but long and
awkward."

 I'm not sure I follow this completely. From 1972 on both the steel wheels and
the Turbina alloys used the same studs - 105.12.21.418.00 front,
105.12.17.418.00 rear- with two different nuts, 105.12.28.100.02 for the steel
wheels, 105.12.28.100.03 with the alloy wheels. The 105.12.28.100.02 nuts for
the steel wheels are the odd deep ones (to cover the length of stud required
for the alloys) with the unique ledge to retain the little 105.12.28.024.00
hubcaps used on all steel-wheeled 1972-and-later 105/115 cars. The
105.12.28.100.03 nuts for use with the alloy wheels are quite neat short
acorns closed with a truncated cone closure, and I believe have an appreciably
larger conical bearing surface at the wheel/nut interface than the steel-wheel
nuts do. One sees the steel-wheel nuts used with Turbinas, but I believe it is
technically, aesthetically, and philosophically incorrect to do so. YMMV.

 I recently noticed that Centerline is listing several copies of factory parts
books, most of them for the earlier 750, 101, and early 105 cars, and none as
late as the Bosch cars. One covers the roundtails; a second is one of the big
and important ones, covering 105 Sprint GT, GTV, GTC and GTA; a third, listed
as "2000 1972-74 Rapid Reference Catalog", seems to be comparable to the
"Catalogo Rapido" which I have for the Alfettas and may be the same as the
#2235 Catalogo Rapido covering the 1300, 1600, 1750 and 2000 Arese Euro cars
(but not any Spiders or injected engines). The full parts catalogs are very
desirable, if you can find them, and the fiches for the later cars are a lot
better than nothing and perhaps better in some respects than hardcopy. I don't
know how well the CarDiscs cover such needs - they may-, but I am very partial
toward having the best available information on tap whenever such questions
might come up, and very partial toward having clearer images of exploded
drawings of assemblies than I would get on a fiche reader or on my monitor.
Some of the greybeards may have it all in their heads, but I don't have that
much experience or that good a memory, and I am glad to see Centerline
offering such a useful range of shop manuals, parts books, and wiring
diagrams.

 John H.

Raleigh, N.C.

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