Bottom Bracket Help?

[Ade]

ive currently running a 2000 gt arrowhead

but the bottom bracket makes a grinding noise when being ridden!

so i would like to replace the bottom bracket with a Shimano UN52/3, but im confused by all the
sizes avaible. can anybody help?

[Pete Biggs]

ADE wrote:
> ive currently running a 2000 gt arrowhead
>
> but the bottom bracket makes a grinding noise when being ridden!
>
> so i would like to replace the bottom bracket with a Shimano UN52/3, but im confused by all the
> sizes avaible. can anybody help?

What type & model cranks, and do you know what model and size BB you have at the moment?

~PB

[Ade]

i think its a Shimano Altus chain set

i havent taken this off yet (just ordered the tool to remove the bb)

"Pete Biggs" <pbiggmellon{remove_fruit}s2000@onetel.net.uk> wrote in message
news:blel65$be17g$1@ID-144931.news.uni-berlin.de...
> ADE wrote:
> > ive currently running a 2000 gt arrowhead
> >
> > but the bottom bracket makes a grinding noise when being ridden!
> >
> > so i would like to replace the bottom bracket with a Shimano UN52/3, but im confused by all the
> > sizes avaible. can anybody help?
>
> What type & model cranks, and do you know what model and size BB you have at the moment?
>
> ~PB

[Zog The Undenia]

ADE wrote:
> ive currently running a 2000 gt arrowhead
>
> but the bottom bracket makes a grinding noise when being ridden!
>
> so i would like to replace the bottom bracket with a Shimano UN52/3, but im confused by all the
> sizes avaible. can anybody help?
>
>
Get the same length spindle as you have at the moment, or your middle ring won't line up with the
middle of your cassette. It's that simple!

[Pete Biggs]

> ADE wrote:
>> ive currently running a 2000 gt arrowhead
>>
>> but the bottom bracket makes a grinding noise when being ridden!
>>
>> so i would like to replace the bottom bracket with a Shimano UN52/3, but im confused by all the
>> sizes avaible. can anybody help?

Sorry ADE. I've started to look into it and I'm just as confused as you! (I don't really "do"
Shimano BB's).

The Altus info* indicates that the chainset is designed for a CT92 BB - which comes in two lengths:
116 & 121mm. I would guess that the 121 is for oversized seat tubes, but that is only a guess. Some
shorter Shimano BB's are designed for double chainsets only, but Altus (and similar) chainsets
don't have double options, do they? Other BB models should fit but I suppose you'd still need one
of these sizes.

Try the rec.bicycles.tech newsgroup.

* www.shimano-europe.com/cycling/phpimages/productserie/service_pdf/SI-F910D -EN.pdf

Zog The Undeniable wrote:
> Get the same length spindle as you have at the moment, or your middle ring won't line up with the
> middle of your cassette. It's that simple!

But ADE doesn't know what the existing one is. Could ask the manufacturer or supplier but you won't
be guaranteed to get the correct answer.

~PB