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 http://www.sheldonbrown.com/bbsize.html 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
news:[email hidden]...

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 message said:

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

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 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

-

"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

"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:
http://www.aardvarkcycles.com/bottombracket.html

More RaceFace:
http://www.speedgoat.com/prod/store/categorie.asp?cid=5&m=RaceFace

AC have adjustable and non-adjustable ISIS BB's:
http://www.amclassic.com/BBs.html

Dunno about a unit that does the whole range though.

hippy

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