Campy BB axle length questions

Bob said:

I'm new to Campy and looking at buying some vintage NR stuff. The
components will likely be fitted to a '79 Raleigh Competition.

left out one question: what's the difference between a 68-ss and
a 70-ss ?

70-SS is for Italian BB. 68-SS is for English. My memory the width is
about 114mm, asymetical.

"Bob" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Bob said:

I'm new to Campy and looking at buying some vintage NR stuff. The
components will likely be fitted to a '79 Raleigh Competition.

left out one question: what's the difference between a 68-ss and
a 70-ss ?

Bob said:

I'm new to Campy and looking at buying some vintage NR stuff. The
components will likely be fitted to a '79 Raleigh Competition.

My BB question:I'm used to French BB axles where the lengths
are typically 118mm for a double... I think that's Japanese standard
too for more doubles. Campy seems to come in at 115mm. Are Campy
cranks closer to the BB by a couple mm ? Just on one side ? Are
campy bearing flanges closer together with a different wall thickness
than I'm used to ?

Thanks,

Just get a Campagnolo Super, Nuovo Record or grand Sport or a Phil Wood
with the rpoper threadintg. 115mm, not symmetric. English threading for
the Raleigh.

On Mon, 12 Sep 2005 02:18:04 GMT, "Wannagofast" <[email hidden]>

Quoted message said:

70-SS is for Italian BB. 68-SS is for English.

Thanks, figured that out this morning. It was way too late to be
posting questions.

Quoted message said:

My memory the width is about 114mm, asymetical.

Any particular reason Campy has shorted axles than most other BB's ?
Are the tapers different so the cranks sit farther out ? OR do they
just like them a little closer to the BB shell ?

Bob,

all your bottom bracket questions are answered in Campagnolo Catalogue
#17. Get it and study it to find the answers you are looking for.

http://www.campyonly.com/history/catalogs.html

- Don Gillies
San Diego, CA

Bob,

all your bottom bracket questions are answered in Campagnolo Catalogue
#17 (1973) and 17a Supplment (1979). Get them and study them to find
the answers you are looking for.

http://www.campyonly.com/history/catalogs.html

In particular, there are two types of campy bottom brackets. Before
1978 the BBs are more narrow, the front mechs have a flat outer cage,
and the crank arms are closer to the chain wheels, to minimize "Q
factor". In 1978 and after, due to CPSC meddling, campy had to add a
lip to the front derailleur, widen the gap between chainwheel and
crank arm, and widen the bottom bracket to 114 mm.

You need to know the date codes on the back of your crank arm (no code
or <1> - <7> is an earlier crank) to decide what bottom bracket to
use.

You need to measure the size of your BB (measure 114 mm or 111 mm.)

You need to know the type of derailleur (with or w/o lip)

If you use a later derailleur with an earlier crank arm, your
derailleur will cut grooves into your crank arm.

If you use an earlier bottom bracket with a later crank arm, your
chainwheel might possibly hit the chain stays.

- Don Gillies
San Diego, CA

I've scanned an article from a 1982 edition of
Campagnolo "Record News" that goes into detail
(more so than catalogues do) about BB specs,
how to tell BBs apart, and so on.

See http://www.minortriad.com/campbb.html

Tom Ace