Square Taper BBs

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

"NickZX6R" wrote in message
...

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" wrote:

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 http://www.sheldonbrown.com/bbsize.html for further info.

John

"NickZX6R" wrote in message
...

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 wrote:

Are all square tapers created equal?

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

"Terry Collins" wrote in message
...
NickZX6R wrote:

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

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


especially power tools....;


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flyingdutch wrote:

wrote:
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" wrote in message
.. .
wrote:
Do that means do it. Any excuse to buy more tools is a good excuse.
; )
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 ca
adjust to suit whatever length you want (i have seen reference to hig
end units that are capable of this; Royce and some other name tha
escapes me...

But i wander off thread! Square taper

Is 'old' on Shimano, No

and still current on campag BB


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