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Main
Date: 12 Jun 2007 04:38:31
From: Mike Howsam
Subject: Which BB design in a frame with threads the 'wrong' way round?
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Hallo,
A nice vintage frame I recently acquired from that eBay has an English
threaded bottom bracket, but the shell appears to have been threaded
the wrong way round - the only possible way to install a BB is if the
fixed cup goes in (clockwise) to the non-drive side, and the
adjustable cup (anti-clockwise) to the drive side.
I've read many threads from this group that have provided a range of
opinions and advice on the mechanical / safety aspects of this issue,
so I'm aware that it's not that unusual and that many French & Italian
BBs have given satisfactory service with drive-side cups that are also
threaded in the 'wrong' direction.
I'm really writing to canvas opinion on a design of BB that will guard
best against unscrewing of the BB cups: is there any advantage in a
model with lockrings on both sides, for example?
Tchin-tchin,
Mike.
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Date: 13 Jun 2007 05:41:58
From: dustoyevsky@mac.com
Subject: Re: Which BB design in a frame with threads the 'wrong' way round?
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On Jun 13, 2:52 am, Mike Howsam <mike.how...@univ-lille2.fr > wrote:
> On 12 juin, 20:04, John Everett
>
> <jevere...@sbcglobal.DEFEAT.UCE.BOTS.net> wrote:
> > Now I'm confused. Did you really mean to say, "all British threaded
> > BBs I've installed (TA Axix-Light Ti, Campanolo Veloce AC-H, Edco
> > competition) can only be installed with the adjustable cup on the
> > drive side and the fixed cup on the non-drive side"? If so you've gotten a hold of a few really weird BBs.
>
> Yes - that is exactly what I meant to say: it's not the BBs that are
> weird, merely the threading of the bottom bracket shell of the frame
> which must be "backwards" since the BBs I've tried will only go in the
> "wrong" way round.
>
> > All British (I.S.O.) bottom brackets have the fixed cup on the drive (right) side and are left
> > hand threaded. The adjustable cup goes on the non-drive (left) side
> > and are right hand threaded. See:
> >http://sheldonbrown.com/gloss_bo-z.html#bottom
>
> Indeed.
>
> > Now...what was your question?
>
> My question was whether there was a design of BB that was better
> suited to this situation than others, and I asked if, for example, a
> BB with adjustable cups on both sides (and hence, lockrings on both
> sides) would go some way to guard against unscrewing of the BB given
> that both cups would presumably have a tendency to undo.
What crankset do you intend to use?
http://www.xxcycle.com/php/boutique/page.php?nom=PRODUITpp&key=1706&FROM=bestwebbuys
http://www.bikepro.com/products/bottom_brackets/strong.sht
I switched taps once long ago, produced a situation similar to yours
on my very own brand-new English-threaded frame. A careful re-chase
with correct taps left enough thread to give trouble-free service with
Campy Nuovo Record BB cups (steel, fairly deep threaded area). Use
included loaded touring w/triple crank (small gears, heavy load), lots
of fixed/SS miles also. Phil alloy rings did not work. Cutting oil of
choice is Rigid Dark, used copiously.
I have an old Merckx Ti race bike that was originally set up with
Mavic, uses the Mavic "no thread" BB, as 1rst link above. Works
fine. --D-y
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Date: 13 Jun 2007 00:52:29
From: Mike Howsam
Subject: Re: Which BB design in a frame with threads the 'wrong' way round?
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On 12 juin, 20:04, John Everett
<jevere...@sbcglobal.DEFEAT.UCE.BOTS.net > wrote:
> Now I'm confused. Did you really mean to say, "all British threaded
> BBs I've installed (TA Axix-Light Ti, Campanolo Veloce AC-H, Edco
> competition) can only be installed with the adjustable cup on the
> drive side and the fixed cup on the non-drive side"? If so you've gotten a hold of a few really weird BBs.
Yes - that is exactly what I meant to say: it's not the BBs that are
weird, merely the threading of the bottom bracket shell of the frame
which must be "backwards" since the BBs I've tried will only go in the
"wrong" way round.
> All British (I.S.O.) bottom brackets have the fixed cup on the drive (right) side and are left
> hand threaded. The adjustable cup goes on the non-drive (left) side
> and are right hand threaded. See:
> http://sheldonbrown.com/gloss_bo-z.html#bottom
Indeed.
> Now...what was your question?
My question was whether there was a design of BB that was better
suited to this situation than others, and I asked if, for example, a
BB with adjustable cups on both sides (and hence, lockrings on both
sides) would go some way to guard against unscrewing of the BB given
that both cups would presumably have a tendency to undo.
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Date: 12 Jun 2007 16:03:11
From: Marcus Coles
Subject: Re: Which BB design in a frame with threads the 'wrong' way round?
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If you need an asymmetric BB for whatever reason then use one with both
cups removable and just switch them or I would use a regular symmetrical
cartridge Bottom Bracket of suitable dimension for the crankset with a
metal not plastic adjustable cup and use blue 242 Loctite on the threads
in both cases.
Marcus
I am not a bicycle mechanic nor do I play one on TV.
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Date: 12 Jun 2007 06:22:57
From: Mike Howsam
Subject: Re: Which BB design in a frame with threads the 'wrong' way round?
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Qui si parla Campagnolo wrote:
> I guess it's too early. On British threaded BBs, the left side is
> righty-tighty and the right side is lefty-tighty..do ya mean the left
> side is left threaded and the right side is right threaded?? THAT
> would be backwards.
I guess that is what I mean, yes: all British threaded BBs I've
installed (TA Axix-Light Ti, Campagnolo Veloce AC-H, Edco competition)
can only be installed with the adjustable cup on the drive side and
the fixed cup on the non-drive side (or, in the case of the Edco which
has two adjustable cups, the cup marked "L" will only go into the
drive side).
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Date: 12 Jun 2007 18:04:34
From: John Everett
Subject: Re: Which BB design in a frame with threads the 'wrong' way round?
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On Tue, 12 Jun 2007 06:22:57 -0700, Mike Howsam
<mike.howsam@univ-lille2.fr > wrote:
>Qui si parla Campagnolo wrote:
>
>> I guess it's too early. On British threaded BBs, the left side is
>> righty-tighty and the right side is lefty-tighty..do ya mean the left
>> side is left threaded and the right side is right threaded?? THAT
>> would be backwards.
>
>I guess that is what I mean, yes: all British threaded BBs I've
>installed (TA Axix-Light Ti, Campagnolo Veloce AC-H, Edco competition)
>can only be installed with the adjustable cup on the drive side and
>the fixed cup on the non-drive side (or, in the case of the Edco which
>has two adjustable cups, the cup marked "L" will only go into the
>drive side).
Now I'm confused. Did you really mean to say, "all British threaded
BBs I've installed (TA Axix-Light Tic, Campanology Velonews AC-H, Ed
co competition) can only be installed with the adjustable cup on the
drive side and the fixed cup on the non-drive side"? If so you've
gotten a hold of a few really weird BBs. All British (I.S.O.) bottom
brackets have the fixed cup on the drive (right) side and are left
hand threaded. The adjustable cup goes on the non-drive (left) side
and are right hand threaded. See:
http://sheldonbrown.com/gloss_bo-z.html#bottom
Now...what was your question?
--
jeverett3<AT >sbcglobal<DOT>net (John V. Everett)
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Date: 12 Jun 2007 23:05:36
From: Dan Burkhart
Subject: Re: Which BB design in a frame with threads the 'wrong' way round?
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Mike Howsam Wrote:
> Hallo,
>
> A nice vintage frame I recently acquired from that eBay has an English
> threaded bottom bracket, but the shell appears to have been threaded
> the wrong way round - the only possible way to install a BB is if the
> fixed cup goes in (clockwise) to the non-drive side, and the
> adjustable cup (anti-clockwise) to the drive side.
>
> I've read many threads from this group that have provided a range of
> opinions and advice on the mechanical / safety aspects of this issue,
> so I'm aware that it's not that unusual and that many French & Italian
> BBs have given satisfactory service with drive-side cups that are also
> threaded in the 'wrong' direction.
>
> I'm really writing to canvas opinion on a design of BB that will guard
> best against unscrewing of the BB cups: is there any advantage in a
> model with lockrings on both sides, for example?
>
> Tchin-tchin,
> Mike.
Are you saying the lock ring is on the left threaded (drive side,) an
the shoulder is on the right threaded (non drive side) cups? If so, tha
is something I have not encountered. What I have run into is cartridg
BBs made in that configuration, but they are scarce.
Dan Burkhart
www.boomerbicycle.c
--
Dan Burkhart
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Date: 12 Jun 2007 05:35:55
From: Qui si parla Campagnolo
Subject: Re: Which BB design in a frame with threads the 'wrong' way round?
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On Jun 12, 5:38 am, Mike Howsam <mike.how...@univ-lille2.fr > wrote:
> Hallo,
>
> A nice vintage frame I recently acquired from that eBay has an English
> threaded bottom bracket, but the shell appears to have been threaded
> the wrong way round - the only possible way to install a BB is if the
> fixed cup goes in (clockwise) to the non-drive side, and the
> adjustable cup (anti-clockwise) to the drive side.
I guess it's too early. On British threaded BBs, the left side is
righty-tighty and the right side is lefty-tighty..do ya mean the left
side is left threaded and the right side is right threaded?? THAT
would be backwards.
>
> I've read many threads from this group that have provided a range of
> opinions and advice on the mechanical / safety aspects of this issue,
> so I'm aware that it's not that unusual and that many French & Italian
> BBs have given satisfactory service with drive-side cups that are also
> threaded in the 'wrong' direction.
>
> I'm really writing to canvas opinion on a design of BB that will guard
> best against unscrewing of the BB cups: is there any advantage in a
> model with lockrings on both sides, for example?
>
> Tchin-tchin,
> Mike.
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