Know the rules The Paceline Forum Builder's Spotlight


Go Back   The Paceline Forum > General Discussion

Reply
 
Thread Tools Display Modes
  #1  
Old 03-08-2009, 06:03 PM
Satellite's Avatar
Satellite Satellite is offline
Senior Member
 
Join Date: Mar 2004
Posts: 1,689
Question on Shimano 7800 Bottom Brackets Help

I have just tore down two of my bikes to tune them up for the return of Spring.

All my bikes are dressed in D/A 7800 and I have just noticed that two of my bottom brackets are different. The one on the left has a larger bearing surface. Did Shimano change the designs is one better than the other? Do I have to match the cranks to the proper bottom bracket because I am NOT sure which is which now.

Any help is appreciated,

Satellite
Attached Images
File Type: jpg bottombracket.jpg (139.0 KB, 122 views)
Reply With Quote
  #2  
Old 03-09-2009, 09:58 AM
LegendRider LegendRider is offline
Senior Member
 
Join Date: Feb 2004
Location: Atlanta, GA
Posts: 3,377
Anyone?
Reply With Quote
  #3  
Old 03-09-2009, 10:20 AM
Spicoli Spicoli is offline
"I piss excellence!"
 
Join Date: Dec 2004
Location: Dunkin Donuts
Posts: 1,074
Same spec.

I had the same thing, My original 7800 group had a different BB than another 7800/01 group I got a little less than a year later. I believe the one on the right is just the newer version? Cranks however did not change so it should not matter which crank goes where. The inner spec and width are the same on both BB's to the best of my knowledge.
Reply With Quote
  #4  
Old 03-09-2009, 11:02 AM
Ken Robb Ken Robb is offline
Senior Member
 
Join Date: Dec 2003
Location: La Jolla, Ca.
Posts: 15,141
I guess the first one was the Beta version. I hope it doesn't make your computer lock up.
Reply With Quote
  #5  
Old 03-09-2009, 11:04 AM
LegendRider LegendRider is offline
Senior Member
 
Join Date: Feb 2004
Location: Atlanta, GA
Posts: 3,377
Speaking of 7800 bottom brackets, mine are stuck. Should I use a rubber mallet to give my ratchet a tap OR should I find some sort of cheater bar for add'l leverage?
Reply With Quote
  #6  
Old 03-09-2009, 11:24 AM
Ken Robb Ken Robb is offline
Senior Member
 
Join Date: Dec 2003
Location: La Jolla, Ca.
Posts: 15,141
I would try gentle taps first because they may undo any corrosion and allow you to get the bb out without using as much torque as you would need to apply with a cheater bar to achieve the same end.
Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -5. The time now is 10:30 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.