Go Back  Bike Forums > Bike Forums > General Cycling Discussion
Reload this Page >

What is this hole/mark on my Giant TCR?

Notices
General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

What is this hole/mark on my Giant TCR?

Old 05-27-22, 03:20 PM
  #1  
Jicafold
Senior Member
Thread Starter
 
Join Date: Jun 2013
Posts: 940
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 286 Post(s)
Liked 85 Times in 63 Posts
What is this hole/mark on my Giant TCR?

So I have this 2006 Giant TCR Advanced carbon frame. Under the top tube there is a hole with a plug in it with surrounding discoloration. It is underneath the top tube about where the letter "N" is. So...

A. Why is this hole here? What is it for?
B. What is with this discoloration? Concerning?




Jicafold is offline  
Old 05-27-22, 07:50 PM
  #2  
Rolla
Former Member
 
Join Date: Sep 2020
Posts: 2,597
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 1156 Post(s)
Liked 2,831 Times in 1,250 Posts
Has it been there for 16 years?
Rolla is offline  
Old 05-27-22, 09:47 PM
  #3  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 3,516

Bikes: lots

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 1773 Post(s)
Liked 2,604 Times in 1,348 Posts
Probably a riv nut for a number holder.
cxwrench is offline  
Likes For cxwrench:
Old 05-28-22, 08:52 AM
  #4  
Iride01 
MotuekaCascadeChinook
 
Iride01's Avatar
 
Join Date: Jul 2017
Location: Mississippi
Posts: 11,433

Bikes: Tarmac Disc Comp Di2 - 2020

Mentioned: 43 Post(s)
Tagged: 0 Thread(s)
Quoted: 4643 Post(s)
Liked 3,144 Times in 2,190 Posts
Used frame you bought from someone else? If so, you need to ask them.
Iride01 is offline  
Old 05-28-22, 09:10 AM
  #5  
FBOATSB 
Senior Member
 
FBOATSB's Avatar
 
Join Date: Jul 2014
Location: Central Indiana
Posts: 2,096

Bikes: Old Stuff

Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 841 Post(s)
Liked 380 Times in 263 Posts
To me it looks like aluminum corrosion from the riv-nut. Looks exactly like the corrosion around the bottle bosses on the down tube. Have you considered scrubbing it off with a soapy tooth brush?
FBOATSB is offline  
Likes For FBOATSB:
Old 05-28-22, 09:33 AM
  #6  
alcjphil
Senior Member
 
alcjphil's Avatar
 
Join Date: Jun 2002
Location: Montreal, Quebec
Posts: 5,158
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1457 Post(s)
Liked 1,105 Times in 663 Posts
Originally Posted by cxwrench View Post
Probably a riv nut for a number holder.
That was my thought even before I saw the pictures
alcjphil is offline  
Old 05-28-22, 10:01 AM
  #7  
FBOATSB 
Senior Member
 
FBOATSB's Avatar
 
Join Date: Jul 2014
Location: Central Indiana
Posts: 2,096

Bikes: Old Stuff

Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 841 Post(s)
Liked 380 Times in 263 Posts
And that plastic bit riveted on there next to the riv-nut has the same corrosion due to the aluminum pop rivets used. Any mild acid will clean that up. A little Coca-cola mixed with a little dish soap and a tooth brush.
FBOATSB is offline  
Old 05-28-22, 10:26 AM
  #8  
_ForceD_
Senior Member on Sr bikes
 
_ForceD_'s Avatar
 
Join Date: Jul 2015
Location: Rhode Island
Posts: 1,904

Bikes: Several...from old junk to new all-carbon.

Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 831 Post(s)
Liked 514 Times in 283 Posts
On the newer models itís for the Di2 cable routing.

_ForceD_ is offline  
Old 05-29-22, 07:06 AM
  #9  
Jicafold
Senior Member
Thread Starter
 
Join Date: Jun 2013
Posts: 940
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 286 Post(s)
Liked 85 Times in 63 Posts
Originally Posted by Iride01 View Post
Used frame you bought from someone else? If so, you need to ask them.
That's a large assumption. Just because someone owned something in the past doesn't mean they know anything about it. Ever watch "Antiques Roadshow"? He likely would not know. He didn't even know what "Dura Ace" was.

I'll try the soapy or Cocacola toothbrush today and see what happens. Thank you.
Jicafold is offline  
Old 05-29-22, 07:32 AM
  #10  
Jicafold
Senior Member
Thread Starter
 
Join Date: Jun 2013
Posts: 940
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 286 Post(s)
Liked 85 Times in 63 Posts
So I cleaned it up with a soapy toothbrush. Much better. Clearly a threaded mount for something.

Jicafold is offline  
Likes For Jicafold:
Old 05-29-22, 09:16 AM
  #11  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 3,516

Bikes: lots

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 1773 Post(s)
Liked 2,604 Times in 1,348 Posts
As I said previously that's for a race number holder.
cxwrench is offline  
Likes For cxwrench:

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.