Non-standard Narrow bottom brackets?

Hello All:

We have a project in my lab in which we would like to use a really
narrow bottom bracket. I have been told that some recumbents might use
narrow bottom brackets but a lot of Google searching did not turn up
anything for me. I have a vague recollection of seeing narrow bottom
brackets at Interbike years ago. Maybe Phil Wood?

Any one have suggestions where I might look?

Thanks,

Jim

On Wed, 10 Oct 2007 19:22:35 -0600, Jim Martin
wrote:

Hello All:

We have a project in my lab in which we would like to use a really
narrow bottom bracket. I have been told that some recumbents might use
narrow bottom brackets but a lot of Google searching did not turn up
anything for me. I have a vague recollection of seeing narrow bottom
brackets at Interbike years ago. Maybe Phil Wood?

Any one have suggestions where I might look?

Thanks,

Jim

Dear Jim,

Sheldon has a list of some bottom bracket dimensions:

http://www.sheldonbrown.com/bbsize.html

The narrowest seem to be Shimano Dura-Ace 7410 double and Sugino RD
5-bolt single, both at 103 mm.

If you figure out how narrow you need, other posters can probably
help.

Cheers,

Carl Fogel

wrote:
Sheldon has a list of some bottom bracket dimensions:

http://www.sheldonbrown.com/bbsize.html

The narrowest seem to be Shimano Dura-Ace 7410 double and Sugino RD
5-bolt single, both at 103 mm.

If you figure out how narrow you need, other posters can probably
help.


Thanks Carl. I was thinking REALLY narrow. Like half of normal. Anyone
seen anything like that? Maybe I should contact the HPV type guys?

Cheers,

Jim

Jim Martin wrote:
We have a project in my lab in which we would like to use a really
narrow bottom bracket. I have been told that some recumbents might use
narrow bottom brackets but a lot of Google searching did not turn up
anything for me. I have a vague recollection of seeing narrow bottom
brackets at Interbike years ago. Maybe Phil Wood?

Phil can make up just about anything.

Narrow as in BSC thread but smaller than 68mm wide?
Or narrow as in a square taper spindle shorter than 102mm overall?
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

Jim Martin wrote:
Hello All:

We have a project in my lab in which we would like to use a really
narrow bottom bracket. I have been told that some recumbents might use
narrow bottom brackets but a lot of Google searching did not turn up
anything for me. I have a vague recollection of seeing narrow bottom
brackets at Interbike years ago. Maybe Phil Wood?

Any one have suggestions where I might look?

I have it on the authority of a movie recently released to DVD that
washing machines are good sources for narrow BB bearings. Get out your
hacksaw and have at it!

Mark J.

"Jim Martin" a écrit:

We have a project in my lab in which we would like to use a really narrow
bottom bracket. I have been told that some recumbents might use narrow
bottom brackets but a lot of Google searching did not turn up anything for
me. I have a vague recollection of seeing narrow bottom brackets at
Interbike years ago. Maybe Phil Wood?

I surfed to this page a day or two ago:

http://www.recumbents.com/WISIL/qfactor/qfactor.htm

James Thomson

On Oct 10, 8:33 pm, wrote:
On Wed, 10 Oct 2007 19:22:35 -0600, Jim Martin
wrote:

Hello All:

We have a project in my lab in which we would like to use a really
narrow bottom bracket. I have been told that some recumbents might use
narrow bottom brackets but a lot of Google searching did not turn up
anything for me. I have a vague recollection of seeing narrow bottom
brackets at Interbike years ago. Maybe Phil Wood?

Any one have suggestions where I might look?

Thanks,

Jim

Dear Jim,

Sheldon has a list of some bottom bracket dimensions:

http://www.sheldonbrown.com/bbsize.html

The narrowest seem to be Shimano Dura-Ace 7410 double and Sugino RD
5-bolt single, both at 103 mm.

If you figure out how narrow you need, other posters can probably
help.

Cheers,

Carl Fogel

Actually, Campagnolo Record/Chorus are 102mm...