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 09-04-10, 04:40 AM   #1
Aquakitty
Canadian Chick
Thread Starter
 
Aquakitty's Avatar
 
Join Date: Jun 2009
Location: BC, Canada
Bikes: Lots
Posts: 641
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Cartridge bottom bracket spindle "feel" is different

So I have some el cheapo Shimano brand new shimano BB's I have been using on my bikes (square taper UN26). Recently I bought a used frameset that already has a square taper BB. Being the conservative sort, I figure there is no reason to replace it if it still has life.
I was feeling for play and the spindle feels nice, no problems so no reason to remove it.

However when i took the cranks off my other bike to install on the new frame, I noticed the newer el cheapo UN26 BB on my other bike is a lot "stiffer" like slower to turn and more like molasses then the used BB. The used BB turns much more easily but there is no noticeable play or anything... which is the correct feel? I am just wondering if I should replace the el cheapo BB's on my old bike to something better or if that's just the way they should feel when new. For $11/BB I am not too concerned about how long it will last, but I don't want it to be sapping my precious power.
Aquakitty is offline   Reply With Quote
Old 09-04-10, 05:50 AM   #2
LesterOfPuppets
cowboy, steel horse, etc
 
LesterOfPuppets's Avatar
 
Join Date: Sep 2008
Location: Rock Springs, WY
Bikes: My War
Posts: 26,666
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 185 Post(s)
Bearings do tend to break in when new. Friction should reduce for a while. Hard to tell whether the new one will ever reach a point where it spins as smoothly as the old one, but not a huge worry.

For the frequency of BB replacement I experience, I typically spring for the un54 for bikes I'm going to keep.

Last edited by LesterOfPuppets; 09-04-10 at 05:53 AM.
LesterOfPuppets is offline   Reply With Quote
Old 09-04-10, 07:07 AM   #3
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,847
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Often on new bottom brackets, the drag is caused by tight seals which will wear in and smooth out after some use.
HillRider is offline   Reply With Quote
Old 09-04-10, 09:42 AM   #4
BCRider
Senior Member
 
BCRider's Avatar
 
Join Date: Mar 2008
Location: The 'Wack, BC, Canada
Bikes: Norco (2), Miyata, Canondale, Soma, Redline
Posts: 5,456
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by HillRider View Post
Often on new bottom brackets, the drag is caused by tight seals which will wear in and smooth out after some use.
That's been my experience even with the higher end BB's. Between the seals, bearing preload and perhaps the excess grease in the bearings that gets pushed to the sides to let the balls run more freely new BB's can feel pretty draggy. Your UN26's will soon spin more freely. They may or may not eventually spin as nicely as the one in your newer frame and they may or may not last as long in poor conditions as the better UN54's.
BCRider 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 12:13 AM.