Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 07-12-10, 01:22 PM   #1
Lawrence08648
Advisor
Thread Starter
 
Join Date: Mar 2008
Location: Central New Jersey
Bikes:
Posts: 544
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Difference BB 30 & "other" bb

I've changed my bottom bracket over the years several times and now am using ISIS.

I know what BB30 is but I've never seen a frame that is setup for the BB30 without it.

Am I getting the impression that a bike frame has to be built for the BB30? and no other BB can be used? If so, this means I can't decide to put a BB30 on my bike that is currently using ISIS?

Looking at the bb frame, what does the setup for a BB30 look like? How does it differ from the "normal", such as the threaded bb for using ISIS, Octalink, etc.
Lawrence08648 is offline   Reply With Quote
Old 07-12-10, 02:16 PM   #2
CACycling
Senior Member
 
CACycling's Avatar
 
Join Date: Feb 2008
Location: Oxnard, CA
Bikes: '08 Fuji Roubaix RC; '07 Schwinn Le Tour GS; '92 Diamond Back Ascent EX
Posts: 4,565
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
BB30 uses a completely different BB shell. It is larger diameter and narrower than what you are used to seeing.
CACycling is offline   Reply With Quote
Old 07-12-10, 02:50 PM   #3
cycle_maven
Collector of Useless Info
 
Join Date: Aug 2009
Bikes:
Posts: 1,408
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
No, a standard frame can't use a BB30 bottom bracket. It's way different- larger diameter with bearings that are pressed right into the frame.

If your frame is already BB30, you can get an adapter that converts it to a standard english bottom bracket. I don't know why anyone would do that, but it's possible.
cycle_maven is offline   Reply With Quote
Old 07-12-10, 07:28 PM   #4
Lawrence08648
Advisor
Thread Starter
 
Join Date: Mar 2008
Location: Central New Jersey
Bikes:
Posts: 544
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The bearings pressed in? I thought the bearings were on the outside? If I have a bike that is BB30, is replacing the bearings something I can do myself? On a replacement or just a frame, are the bearings something I can press in using a C clamp? Is this something most bike shops would have the tool to press the bearings in?
Lawrence08648 is offline   Reply With Quote
Old 07-12-10, 08:00 PM   #5
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Lawrence08648 View Post
The bearings pressed in? I thought the bearings were on the outside? If I have a bike that is BB30, is replacing the bearings something I can do myself? On a replacement or just a frame, are the bearings something I can press in using a C clamp? Is this something most bike shops would have the tool to press the bearings in?
A high end shop will have tools to deal with BB30. It's not extremely common yet so I doubt most regular road shops will have the tools to service it.
operator is offline   Reply With Quote
Old 07-12-10, 11:43 PM   #6
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 22,233
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 1155 Post(s)
external bearing crank, but the frame was made wider so the big diameter bearings, with lots of little balls is back internal in the frame.

Kind of like a 3 piece crank adapter for an American One piece crank Frame.
if you want to use older spline or square taper BB's back in the day

perhaps look for a Normal BB frame ... How about a metal one?
fietsbob is offline   Reply With Quote
Old 07-13-10, 12:08 AM   #7
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by fietsbob View Post
external bearing crank, but the frame was made wider so the big diameter bearings, with lots of little balls is back internal in the frame.

Kind of like a 3 piece crank adapter for an American One piece crank Frame.
if you want to use older spline or square taper BB's back in the day

perhaps look for a Normal BB frame ... How about a metal one?
Looks like somebody was smoking a bit too much pot today.
operator is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 06:18 PM.