Square Taper BBs

"NickZX6R" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Are all square tapers created equal?

I haven't found any definitive info saying that they are,
but I haven't found anything solid to suggest that one
manufacturer's square taper is different to another's.

Anyone know whether different manufacturers' square taper
BBs and cranks are interchangeable?

If you're desparate, yes. If you're doing the job properly,
and don't want to wreck a crank, no. There's at least 2
types of taper that I'm aware of, JIS(Jap Industry Std) and
ISO. They also come in different lengths, and even two
bottom brackets with the same taper and length can be
different, as they can have different offsets from L->R.
Then there's different BB threadings... Easiest to stick to
the same manufacturer and length, otherwise find the
numbers printed on it and match it to another brand......
Sorry! Gemma

NickZX6R said:

Are all square tapers created equal?

I haven't found any definitive info saying that they are,
but I haven't found anything solid to suggest that one
manufacturer's square taper is different to another's.

Anyone know whether different manufacturers' square taper
BBs and cranks are interchangeable?

Aside from the obviously different lengths available
(usually somewhere from 107 to 127 mm), there are other
differences.

For sealed units, you need to know the shell width
(68, 70 or 73
mm) and thread (English or Italian).

There's also the more subtle difference in the taper size
between the ISO and JIS standards. This effects the fit of
the crank.

I'd expect the "norm" here to be 68 mm shell, English
thread, JIS taper.

See sheldonbrown.combbsize.htmlOpen ↗ for
further info.

John

"NickZX6R" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Are all square tapers created equal?

I haven't found any definitive info saying that they are,
but I haven't found anything solid to suggest that one
manufacturer's square taper is different to another's.

Anyone know whether different manufacturers' square taper
BBs and cranks are interchangeable?

Cheers.

--
Nick

From my experience, I have learned that swapping BB's and
cranks from different manufacturers causes a lot of angst
and unhappiness. The main problem being the different axle
lengths and crank offsets causing things not to line up. The
front derailleur may not cover the distance to the chain
rings or a chainring may not clear the stay. There are other
problems too. Try and stick with one manufacturer.

Marty

NickZX6R said:

Are all square tapers created equal?

Absolutely not. Mix and match can create a lot of problems
and increase your tool count.

"Terry Collins" <[email hidden]> wrote in message
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Quoted message said:

NickZX6R said:

Are all square tapers created equal?

Absolutely not. Mix and match can create a lot of problems
and increase your tool count.

Do that means do it. Any excuse to buy more tools is a good
excuse. ; )

Fraser

Quoted post said:

Do that means do it. Any excuse to buy more tools is a good
excuse. ; )

Fraser [/B]

especially power tools....😉

flyingdutch said:

Quoted message said:

Do that means do it. Any excuse to buy more tools is a
good excuse. ; ) Fraser

especially power tools....😉

Chuckle. {:-).

I have had TA cranks for about 30 years and have about 5
different crank extractors to match the various axles I've
used over the years on everything from a K-mart pre-used
(given) to a MTB. So you are warned.

Unfortunately, I have not found a way to incorporate power
tools {:-(.

Actually, that reminds me, I'm learning to use a lather and
milling machine at TAFE, so must put a few custom axles
(length and clearance) on the foreign orders list {:-)

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

Quoted message said:

Quoted message said:

Do that means do it. Any excuse to buy more tools is a
good excuse.

; )

Quoted message said:

Quoted message said:

Fraser

especially power tools....😉

Or air tools. Because that way you have an excuse to buy a
compressor as well.

Fraser

Having jsut gone down the upgrade path meself (Veloce to Chorus triple) makes me wonder why manufacturers dont make just ONE BB that you can adjust to suit whatever length you want
(i have seen reference to high end units that are capable of this; Royce and some other name that escapes me...)

But i wander off thread!
Square tapers

Is 'old' on Shimano, No?

and still current on campag BBs

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

Quoted message said:

Having jsut gone down the upgrade path meself (Veloce
to Chorus

triple)

Quoted message said:

makes me wonder why manufacturers dont make just ONE BB
that you can adjust to suit whatever length you want (i
have seen reference to high end units that are capable of
this; Royce and some other name that escapes me...)

The top two RaceFace BB's are adjustable to suit two BB
shell widths:
aardvarkcycles.combottombracket.htmlOpen ↗

More RaceFace: speedgoat.comcategoriOpen ↗
e.asp?cid=5&m=RaceFace

AC have adjustable and non-adjustable ISIS BB's:
amclassic.comBBs.htmlOpen ↗

Dunno about a unit that does the whole range though.

hippy

"Fraser Johnston" wrote

Quoted message said:

Or air tools. Because that way you have an excuse to buy a
compressor as well.

Doesn't everybody already have one? :-)

Theo

Gemma Kernich said:

"NickZX6R" <[email hidden]> wrote in
message "]news:[email hidden]...

Quoted message said:

Are all square tapers created equal?

I haven't found any definitive info saying that they are,
but I haven't found anything solid to suggest that one
manufacturer's square taper is different to another's.

Anyone know whether different manufacturers' square taper
BBs and cranks are interchangeable?

Quoted message said:

If you're desparate, yes. If you're doing the job
properly, and don't want to wreck a crank, no. There's at
least 2 types of taper that I'm aware of, JIS(Jap Industry
Std) and ISO. They also come in different lengths, and
even two bottom brackets with the same taper and length
can be different, as they can have different offsets from
L->R. Then there's different BB threadings... Easiest to
stick to the same manufacturer and length, otherwise find
the numbers printed on it and match it to another
brand...... Sorry! Gemma

I forgot to mention that I already knew about the different
lengths and offsets but I wasn't sure about the actual size
and shape of the taper.

Anyway, thanks all for the responses, even if it wasn't the
answer I was looking for 🙂

--
Nick