BB axle install

Joseph S. said:

While re-installing an older bottom bracket I noticed the axle can go in either end first. Does it
matter which way the axle goes in? Only markings I see are stamped on one end it says "3R". help
needed and appreciated.

I belive the 3R size is symmetrical, but, in any case, there is an easy way to know which whay they
face. This is true of all bottom brackets that I'm aware of.

If you imagine it installed in a transparent bicycle, the marking should read right-side-up to the
rider looking down.

Sheldon "Wouldn't A Transparent Bike Be Cool!" Brown
+--------------------------------------------------+
| Take sides! Always take sides! | You will sometimes be wrong--but the man who | refuses to take
| sides must _always_ be wrong. | Heaven save us from poltroons who fear | to make a choice.
| --Robert A. Heinlein |
+--------------------------------------------------+ Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041 harriscyclery.comharriscyclery.comOpen ↗ Hard-to-find parts shipped Worldwide
captainbike.comcaptainbike.comOpen ↗ sheldonbrown.comsheldonbrown.comOpen ↗

I did measure it and yes it is symmetrical. Thanks for the tip on axle print reading. I'm sure it
will come in handy on future servicing.

Joseph S.

"Sheldon Brown" <[email hidden]> wrote in message "]news:[email hidden]...

Quoted message said:

Quoted message said:

Sheldon "Wouldn't A Transparent Bike Be Cool!" Brown

It's been done, and even gone one better. It was described in an episode of "Scientific American
Frontiers"

pbs.org1309 1.htmOpen ↗

"In his course called "How to Make (Almost) Anything," Gershenfeld's students fabricate tangible
objects from the plans they design on computers, using computer-controlled machines to cut through
materials ranging from plastic to steel. Alan tries out a one-of-a-kind bicycle made by one student
based on a model of Matisse's Blue Nude Number Two."

"Joseph S." <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

While re-installing an older bottom bracket I noticed the axle can go in either end first. Does it
matter which way the axle goes in? Only markings

I

Quoted message said:

see are stamped on one end it says "3R". help needed and appreciated.

A type "R" is more asymmetric than most (25mm left, 42mm right) . Long side on the right.

--
Andrew Muzi yellowjersey.orgyellowjersey.orgOpen ↗ Open every day since 1 April 1971

Peter Cole said:

"Sheldon Brown" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Quoted message said:

Sheldon "Wouldn't A Transparent Bike Be Cool!" Brown

It's been done, and even gone one better. It was described in an episode of "Scientific American
Frontiers"

pbs.org1309 1.htmOpen ↗

"In his course called "How to Make (Almost) Anything," Gershenfeld's students fabricate tangible
objects from the plans they design on computers, using computer-controlled machines to cut through
materials ranging from plastic to steel. Alan tries out a one-of-a-kind bicycle made by one student
based on a model of Matisse's Blue Nude Number Two."

Damn... there goes another dream!