Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Bottom Bracket (tiny gap between cups and frame)

Notices
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.

Bottom Bracket (tiny gap between cups and frame)

Old 01-16-21, 02:53 AM
  #1  
Danfidanya
Trainee
Thread Starter
 
Join Date: Jan 2021
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Bottom Bracket (tiny gap between cups and frame)

I tried to post images but was not allowed since this is my first post!

I have stripped my bike to its frame to clean and rebuild. When reinstalling the bottom bracket I noticed a small gap between the cups and the frame on the bottom (on the top the cups are touching the frame and if i tighten any more the cups will dig into the frame.

Should I be concerned?

The spindle turns fluidly without any play, but it was really tough to thread the adjustable cup (fixed cup was smooth), but both cups have a small millimeter gap.
Danfidanya is offline  
Old 01-16-21, 04:22 AM
  #2  
cb400bill
Inoxidable Moderator
 
cb400bill's Avatar
 
Join Date: Jul 2007
Location: Kalamazoo MI
Posts: 18,845

Bikes: Fuji SL 2.1 Carbon, Cannondale Synapse Alloy, Trek 710 531 Steel

Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 2207 Post(s)
Liked 2,198 Times in 1,372 Posts
pic assist

https://www.bikeforums.net/g/album/20310203





__________________
Be nice


cb400bill is offline  
Old 01-16-21, 04:59 AM
  #3  
Danfidanya
Trainee
Thread Starter
 
Join Date: Jan 2021
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks for adding my photos🙏
Danfidanya is offline  
Old 01-16-21, 05:46 AM
  #4  
100bikes
Industry guy
 
Join Date: Nov 2007
Location: Minnesota
Posts: 280

Bikes: To many to name - I ride a custom built steel frame.

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 84 Post(s)
Liked 37 Times in 25 Posts
With conventional bottom brackets, especially on better quality ones,
the shell should be faced(milled in metal working terms).

This brings the surfaces to parallel, and aligns everything correctly.

The cups would seat properly and the alignment perfect.
rusty
100bikes is offline  
Old 01-16-21, 09:35 AM
  #5  
DaveSSS 
Senior Member
 
Join Date: Sep 2008
Location: Loveland, CO
Posts: 6,217

Bikes: TWO Cinelli superstar disc with SRAM Force AXS

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 576 Post(s)
Liked 251 Times in 202 Posts
That's a huge gap. Almost looks like the BB is cross threaded.
DaveSSS is offline  
Likes For DaveSSS:
Old 01-16-21, 11:35 AM
  #6  
aSmelly1
Newbie
 
Join Date: Jan 2021
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Someone please correct me on this if I'm wrong, haven't been working on vintage for too terribly long.
Make sure your cups are on the correct sides. The adjustable cup should always be non drive side... If my brain is orienting the pictures correctly, it looks like the adjustable might be on drive side. I did the same thing/had the same gap on the first old basket case I tried to fixie convert.. fortunately it was a cheap bike when new and even more fortunately I didn't strip or cross any shell threads. If they do seem to be on the wrong sides, dont use too much force when twisting them in the correct sides. If you feel a deal of resistance and suspect any cross-threading, take that frame to your LBS and see if they can chase the threads (or give any other advice) before it gets any worse.
And if you didn't already, liberally lube those shell threads.
aSmelly1 is offline  
Likes For aSmelly1:
Old 01-16-21, 12:20 PM
  #7  
HillRider
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 32,677

Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

Mentioned: 36 Post(s)
Tagged: 0 Thread(s)
Quoted: 1595 Post(s)
Likes: 0
Liked 428 Times in 332 Posts
The only way the cups could have been reversed is if the shell is Italian threaded (or even less likely French) or the cups were horribly cross threaded. If the threads are correct and the cups installed on the proper sides, that frame is badly in need of facing.
HillRider is offline  
Old 01-17-21, 12:06 AM
  #8  
Litespud
Senior Member
 
Join Date: Oct 2017
Location: Chapel Hill NC
Posts: 1,186

Bikes: 2000 Litespeed Vortex Chorus 10, 1995 DeBernardi Cromor S/S, Nashbar 3sp commuter

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 447 Post(s)
Liked 438 Times in 248 Posts
Originally Posted by cb400bill View Post
just to clarify, is that a lock ring on the drive side? If so, I think its on the wrong side. When you installed the cups, were you able to at least start the threading by hand before you took a wrench to them? Did they both screw in clockwise or was one counterclockwise? Is there anything engraved on either of the cups (Im thinking of something like 1.37 x 24tpi or 36mm x 24tpi)? Trying to determine what sort of BB threading you have.
an uneven gap suggests that you might need to have the BB shell faced at the LBS
Litespud is offline  
Old 01-17-21, 07:30 AM
  #9  
dedhed
SE Wis
 
dedhed's Avatar
 
Join Date: Apr 2005
Location: Milwaukee, WI
Posts: 7,307

Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400, 2013 Novara Randonee, 1990 Trek 970

Mentioned: 27 Post(s)
Tagged: 0 Thread(s)
Quoted: 1486 Post(s)
Liked 985 Times in 668 Posts
Originally Posted by HillRider View Post
The only way the cups could have been reversed is if the shell is Italian threaded (or even less likely French) or the cups were horribly cross threaded. If the threads are correct and the cups installed on the proper sides, that frame is badly in need of facing.
The perceived (because photo angles) unevenness of the gap on the fixed cup suggests to me a cross threading issue.
OP - How did the cup gap look before you initially removed them?
dedhed is offline  

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.