Shimano bottom bracket help sought

[Alan]

Morning all

I have a Shimano Dure Ace double chainset - probably about 5/6 years old
which has a sealed bottom bracket with the old square splined (old
fashioned/traditional) way of anchoring the cranks via a pressure fit.
Its started making noises and I decided to replace it.

Having removed it from the frame it would appear to be a 68mm and only
about 102mm wide (very narrow). It has a Shimano reference of BB-7410

I popped down my local (reasonably comprehensive) bike shop and it would
appear that there is no longer any form of replacement available -
neither 105/600 et al. The main sticking point being the very narrow
width of the bracket.

Just wondering if anyone out there has any ideas - are there any third
party solutions.

Otherwise my only solution would appear to be to purchase a new chainset
and BB and this will set me back about £240 (ouch)

TIA

Cheers

Alan

 

[Brian G]

Alan wrote:
> Morning all
>
> I have a Shimano Dure Ace double chainset - probably about 5/6 years old
> which has a sealed bottom bracket with the old square splined (old
> fashioned/traditional) way of anchoring the cranks via a pressure fit.
> Its started making noises and I decided to replace it.
>
> Having removed it from the frame it would appear to be a 68mm and only
> about 102mm wide (very narrow). It has a Shimano reference of BB-7410
>
> I popped down my local (reasonably comprehensive) bike shop and it would
> appear that there is no longer any form of replacement available -
> neither 105/600 et al. The main sticking point being the very narrow
> width of the bracket.
>
> Just wondering if anyone out there has any ideas - are there any third
> party solutions.
>
> Otherwise my only solution would appear to be to purchase a new chainset
> and BB and this will set me back about £240 (ouch)
>
> TIA
>
> Cheers
>
> Alan

Try here: http://www.chainreactioncycles.com/Models.aspx?ModelID=156
Not sure if it's the right one, but the dimensions you gave may not be
exact?

--
Brian G

 

[Tony Raven]

Brian G wrote:
>
> Try here: http://www.chainreactioncycles.com/Models.aspx?ModelID=156 Not
> sure if it's the right one, but the dimensions you gave may not be exact?
>

If you get that one make sure the frame is Italian and not English. The
differences can be found at http://sheldonbrown.com/gloss_bo-z.html#bottom
--
Tony

"I did make a mistake once - I thought I'd made a mistake but I hadn't"
Anon

 

[Brian G]

Tony Raven wrote:
> Brian G wrote:
>
>>
>> Try here: http://www.chainreactioncycles.com/Models.aspx?ModelID=156
>> Not sure if it's the right one, but the dimensions you gave may not be
>> exact?
>>
>
> If you get that one make sure the frame is Italian and not English. The
> differences can be found at http://sheldonbrown.com/gloss_bo-z.html#bottom

OK, I nominate me for ******** of the week. I didn't even look at the
thread size, just found a BB of the right code no. with an
approximately close length. It was quite early in the morning :-(

--
Brian G

 

[Tony Raven]

Brian G wrote:
> Tony Raven wrote:
>
>> Brian G wrote:
>>
>>>
>>> Try here: http://www.chainreactioncycles.com/Models.aspx?ModelID=156
>>> Not sure if it's the right one, but the dimensions you gave may not
>>> be exact?
>>>
>>
>> If you get that one make sure the frame is Italian and not English.
>> The differences can be found at
>> http://sheldonbrown.com/gloss_bo-z.html#bottom
>
>
> OK, I nominate me for ******** of the week.

Not necessarily. Italian bikes are sold over here. However I will
agree the number of Italian bikes sold with S*****o groupsets must be
vanishingly small ;-)

--
Tony

"I did make a mistake once - I thought I'd made a mistake but I hadn't"
Anon

 

[Tom]

"Alan" <[email protected]> wrote in message
news:[email protected]...
>
> Thanks for the links guys - am I right in assuming that Campag and
> Shimano are compatable.
>

No!

Shimano and Campagnola use different tapers, so they are not compatible.

Tom

 

[m-gineering]

Tony Raven wrote:
>
> Brian G wrote:
> > Tony Raven wrote:
> >
> >> Brian G wrote:
> >>
> >>>
> >>> Try here: http://www.chainreactioncycles.com/Models.aspx?ModelID=156
> >>> Not sure if it's the right one, but the dimensions you gave may not
> >>> be exact?
> >>>
> >>
> >> If you get that one make sure the frame is Italian and not English.
> >> The differences can be found at
> >> http://sheldonbrown.com/gloss_bo-z.html#bottom
> >
> >
> > OK, I nominate me for ******** of the week.
>
> Not necessarily.


This might actually work as on the Dura Ace axle the RH cup is a
pressfit. I think you could remove the axleunit and use the threaded
bits from your existing axle.

Campagnolo, TA and Stronglight do 103 mm axles, but they will have ISO
squares, instead of the JIS you want.

Otherwise try KSS, Phil Wood or Royce

--
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl

 

[Tony Raven]

Tom wrote:
> "Alan" <[email protected]> wrote in message
> news:[email protected]...
>
>>Thanks for the links guys - am I right in assuming that Campag and
>>Shimano are compatable.
>>
>
>
> No!
>
> Shimano and Campagnola use different tapers, so they are not compatible.
>
> Tom
>
>

True, sorry. You could always buy a gorgeous Phil Woods BB of Sheldon
for just $99 though.
http://harriscyclery.net/site/itemdetails.cfm?ID=1384

--
Tony

"I did make a mistake once - I thought I'd made a mistake but I hadn't"
Anon

 

[James Thomson]

"Alan" <[email protected]> wrote:

> Having removed it from the frame it would appear to be a 68mm
> and only about 102mm wide (very narrow). It has a Shimano
> reference of BB-7410

That's 103mm: the shortest square taper bottom bracket Shimano ever made.
It was only required for the DA 7410 cranks. The originals are fairly
scarce.

I've used an FSA Ultimax. There's a steel model:

http://www.wiggle.co.uk/Default.asp...cle&CategoryName=&ProdID=5110000126&UberCat=0

http://tinyurl.com/75rlm

or a titanium one:

http://www.ukbikestore.co.uk/acatalog/info_210-2203-2216.html

They have replaceable cartridge bearings. You need the JIS taper.

The fact that your bottom bracket shell measures 68mm means that you almost
certainly have a British thread. If you buy the Italian model that somebody
linked to, you *may* be able to press the cartridge unit out of the
mounting cups and use your current cups to mount the cartridge - but I
haven't tried to do that with this model.

James Thomson

 

[Sandy Morton]

In article <[email protected]>, Tony Raven
<[email protected]> wrote:
> > OK, I nominate me for ******** of the week.

> Not necessarily. Italian bikes are sold over here. However I will
> agree the number of Italian bikes sold with S*****o groupsets must
> be vanishingly small ;-)

40 years in the trade and I have never seen an Italian threaded BB!

I did see in the current Acorn catalogue that the other BB's were
threaded BSA - ah nostalgia.

--
A T (Sandy) Morton
on the Bicycle Island
In the Global Village
http://www.millport.net

 

[Tony Raven]

Sandy Morton wrote:
>
> 40 years in the trade and I have never seen an Italian threaded BB!
>

You just used too big a spanner to notice ;-)

(I've known people successfully fit the right cup on the left and vice
versa with a big spanner plus brute force and ignorance)

--
Tony

"I did make a mistake once - I thought I'd made a mistake but I hadn't"
Anon

 

[mb]

In article <[email protected]>, [email protected]
says...

> Not necessarily. Italian bikes are sold over here. However I will
> agree the number of Italian bikes sold with S*****o groupsets must be
> vanishingly small ;-)
>

=:-o are you sure? I've got 2 in the shed...

--
Mike

 

[Tony Raven]

mb wrote:
> In article <[email protected]>, [email protected]
> says...
>
>
>>Not necessarily. Italian bikes are sold over here. However I will
>>agree the number of Italian bikes sold with S*****o groupsets must be
>>vanishingly small ;-)
>>
>
>
> =:-o are you sure? I've got 2 in the shed...
>

Expect a visit from the Campag mafia with a pair of concrete
overshoes..... The Italians get passionate about such matters ;-)

--
Tony

"I did make a mistake once - I thought I'd made a mistake but I hadn't"
Anon

 

[m-gineering]

Tony Raven wrote:
>
> mb wrote:
> > In article <[email protected]>, [email protected]
> > says...
> >
> >
> >>Not necessarily. Italian bikes are sold over here. However I will
> >>agree the number of Italian bikes sold with S*****o groupsets must be
> >>vanishingly small ;-)
> >>
> >
> >
> > =:-o are you sure? I've got 2 in the shed...
> >
>
> Expect a visit from the Campag mafia with a pair of concrete
> overshoes..... The Italians get passionate about such matters ;-)
>

Don't worry. Just drop "did you know Shimano has a factory in Italy"
early in the conversation and they are off like a shot.

--
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl