Campy triple bb question

[Alan]

I am trying to buy a Phil Wood bb for a used Racing Triple crankset I
purchased. I'm guessing that it is a 2000 or later crank. It is an
english BB and has a 31.9 seat tube so I need a 115 bb but I don't
know if I need a symmetric or asymmetric bb. I think I need a
symmetric bb as all Campy triples after a certain date are symmetric.
My dealer thinks I need an asymmetric bb. Can anyone confirm what I
need?

Thanks!!!

Alan

 

[A Muzi]

Alan wrote:
> I am trying to buy a Phil Wood bb for a used Racing Triple crankset I
> purchased. I'm guessing that it is a 2000 or later crank. It is an
> english BB and has a 31.9 seat tube so I need a 115 bb but I don't
> know if I need a symmetric or asymmetric bb. I think I need a
> symmetric bb as all Campy triples after a certain date are symmetric.
> My dealer thinks I need an asymmetric bb. Can anyone confirm what I
> need?

Campagnolo's Racing Triple in the 90s used the symmetric Athena
(111/113). 2000 RT use ACH symmetric (111/115) BB.

It's the later Chorus Triple and Record Triple which mated to the
asymmetric 113 BB format.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

 

[Pete Biggs]

Alan wrote:
> I am trying to buy a Phil Wood bb for a used Racing Triple crankset I
> purchased. I'm guessing that it is a 2000 or later crank. It is an
> english BB and has a 31.9 seat tube so I need a 115 bb but I don't
> know if I need a symmetric or asymmetric bb. I think I need a
> symmetric bb as all Campy triples after a certain date are symmetric.
> My dealer thinks I need an asymmetric bb. Can anyone confirm what I
> need?

Symmetric.

But you won't necessarily need a 115 (even though Campag say you will). Try
a 111 first for the sake of a better chainline and q factor. You only need
a 115 if it's not possible for the front derailleur to shift to the inner
position without the seat tube obstructing it. You could even file a bit
off the back of the deraileur to allow more travel.

~PB

 

[[email protected]]

On Nov 29, 1:00 am, "Pete Biggs"
<[email protected]> wrote:
> Alan wrote:
> > I am trying to buy a Phil Wood bb for a used Racing Triple crankset I
> > purchased. I'm guessing that it is a 2000 or later crank. It is an
> > english BB and has a 31.9 seat tube so I need a 115 bb but I don't
> > know if I need a symmetric or asymmetric bb. I think I need a
> > symmetric bb as all Campy triples after a certain date are symmetric.
> > My dealer thinks I need an asymmetric bb. Can anyone confirm what I
> > need?
>
> Symmetric.
>
> But you won't necessarily need a 115 (even though Campag say you will). Try
> a 111 first for the sake of a better chainline and q factor. You only need
> a 115 if it's not possible for the front derailleur to shift to the inner
> position without the seat tube obstructing it. You could even file a bit
> off the back of the deraileur to allow more travel.
>
> ~PB

I use a triple Centaur crankset with the 111mm ACH bottom bracket on a
bike with a 31.8mm seattube. Works perfectly well. I would not even
try the 115mm length on a bike with a 35mm seattube.

 

[Pete Biggs]

A Muzi wrote:
> Alan wrote:
>> I am trying to buy a Phil Wood bb for a used Racing Triple crankset I
>> purchased. I'm guessing that it is a 2000 or later crank. It is an
>> english BB and has a 31.9 seat tube so I need a 115 bb but I don't
>> know if I need a symmetric or asymmetric bb. I think I need a
>> symmetric bb as all Campy triples after a certain date are symmetric.
>> My dealer thinks I need an asymmetric bb. Can anyone confirm what I
>> need?
>
> Campagnolo's Racing Triple in the 90s used the symmetric Athena
> (111/113). 2000 RT use ACH symmetric (111/115) BB.
>
> It's the later Chorus Triple and Record Triple which mated to the
> asymmetric 113 BB format.

Chorus and Record Triple is asymmetric 111mm - for use with all seat tubes.
No 113 or 115.

~PB