"Cadat caelum" - Pullus Parvus
On 3 Jun 2006 06:06:09 -0700, "Qui si parla Campagnolo"
<
[email protected]> wrote:
>John Dacey wrote:
>> Campagnolo spindles have consistently used ISO taper styles as have
>> some models of Stronglight. Other Stronglight models have used the JIS
>> taper dimension however, so you'll have to offer specifics about the
>> cranks and spindles in question for anyone to provide accurate
>> information about appropriate lengths and offsets.
>>
>> As for compatibility, both ISO and JIS spindles have two degree
>> tapers, so crank damage from mixing crank and spindle from these two
>> styles is usually unlikely.
>BUT altho 2 degree tapers, the actual dimension of the BB spindle
>varies in millimeters, each being a different 'part' of the taper, with
>ISO being smaller. If you use a JIS crank, for instance, it 'may'
>bottom onto a ISO BB spindle and come loose when riding, ruining the
>crank.
A crank bolt that bottoms against the spindle end is easily recognized
by an experienced mechanic when the fastener is brought to its torque
spec. Your caveat creates needless anxiety over a situation that
happens only infrequently and is readily evident when it does.
As a guide, *any* time that cranks and bottom brackets from different
makers and/or models are paired, the resulting match should be
inspected closely for chainline and appropriate depth of insertion of
the spindle within the crank. Even among models that are nominally
"ISO" or "JIS", there may be small differences (tolerances) in how a
particular manufacturer conforms to the generic specification.
-------------------------------
John Dacey
Business Cycles, Miami, Florida
Since 1983
Our catalog of track equipment: online since 1996
305-273-4440
http://www.businesscycles.com
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