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 10-04-10, 07:48 PM   #1
akansaskid
Freddin' it
Thread Starter
 
Join Date: Jul 2008
Location: Wichita
Bikes:
Posts: 783
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Tips for BB Replacement Procedure on a Carbon Fiber Frame?

Getting close to installing a new 105 external BB to replace the FSA MegaExo BB on my carbon fiber Roubaix. What tips do you have? Do I need to dress the threads (frame or BB) with anything? I plan to remove and replace using an external cartridge wrench, but no torque wrench. Are the torque specs the same for the BB regardless of frame material? Thanks!
akansaskid is offline   Reply With Quote
Old 10-04-10, 08:43 PM   #2
cracker7213
Senior Member
 
cracker7213's Avatar
 
Join Date: Sep 2007
Bikes:
Posts: 75
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Carbon fiber will require a specific torque that you should not over look. Remember Carbon fiber can crack easily. I would bring it to a shop, but if you have the knowledge and tools, i.e. a facing tool and torque wrench you should be fine. Just look up "how to face a BB on google. The only thing you need to do to the frame before the install is lubricate. Remember, never material on material. Always lubricate.
cracker7213 is offline   Reply With Quote
Old 10-05-10, 11:17 AM   #3
akansaskid
Freddin' it
Thread Starter
 
Join Date: Jul 2008
Location: Wichita
Bikes:
Posts: 783
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Thanks, *******. Why the facing tool? The current BB has been off and back on again in it's life. I was thinking the new one would just spin back on. What does facing do to an already in-use frame? (Not a challenge, I truly don't know.) And what lubricant? Bearing grease? Something specific to carbon? Thanks!
akansaskid is offline   Reply With Quote
Old 10-05-10, 12:46 PM   #4
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 18,841
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 223 Post(s)
well the torque wrench and tools to put the external bearing assembly in are required
then Know the torque specs , anti seize the cups thread, to make the removal go well the next time
torque spec is different than a dry fit.
and if all is aligned the axle tube should slide in both sides, with out binding.
If it binds or doesn't go in easily the threads in the frame are not aligned.
fietsbob 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 02:48 AM.