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

Foam-Filled 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.

Foam-Filled Frame.

Old 04-29-11, 06:51 AM
  #1  
Gerry Hull
Banned.
Thread Starter
 
Join Date: Jan 2011
Posts: 359
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Foam-Filled Frame.

Recently I built a machine with a gigantic-tubed aluminum frame. The increased noisiness was getting me a bit out of joint, so I packed the downtube with pieces of light rubber foam shoved in through the headtube. Sealed it at both ends so it couldnt get waterlogged. It helped a great deal. Much less racket from all sources.

Didnt want to use Great Stuff or anything like that. Messy and irreversible.

Anyone have experience with something like this?
Gerry Hull is offline  
Old 04-29-11, 08:40 AM
  #2  
jsharr
You Know!? For Kids!
 
jsharr's Avatar
 
Join Date: Apr 2005
Location: Just NW of Richardson Bike Mart
Posts: 6,166

Bikes: '05 Trek 1200 / '90 Trek 8000 / '? Falcon Europa

Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 32 Post(s)
Liked 9 Times in 9 Posts
Never done it, but sounds okay I guess. Wonder if in the future, you could use an air compressor and rig some sort of blowing device to blow home insulation in there?
__________________
Are you a registered member? Why not? Click here to register. It's free and only takes 27 seconds! Help out the forums, abide by our community guidelines.
Originally Posted by colorider View Post
Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
jsharr is offline  
Old 04-29-11, 08:50 AM
  #3  
canam73
Senior Member
 
Join Date: Jun 2007
Location: Haunchyville
Posts: 6,400
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Liked 5 Times in 2 Posts
No experience, but I believe Sampson sells some frames like that.
canam73 is offline  
Old 04-29-11, 12:05 PM
  #4  
cyclist2000
Senior Member
 
cyclist2000's Avatar
 
Join Date: Sep 2009
Location: Up
Posts: 4,430

Bikes: Masi, Giant TCR, Eisentraut (retired), Jamis Aurora Elite, Zullo, Cannondale, 84 Stumpjumper, Waterford, Tern D8, Bianchi, Gunner Roadie, Serotta, and looking for a Brompton M6R

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 259 Post(s)
Liked 1,460 Times in 420 Posts
My Bianchi frame says it has structural foam in it. Whatever that is.
cyclist2000 is offline  
Old 04-29-11, 06:46 PM
  #5  
HillRider
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 32,859

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

Mentioned: 38 Post(s)
Tagged: 0 Thread(s)
Quoted: 1671 Post(s)
Likes: 0
Liked 529 Times in 396 Posts
Never did it to quiet an entire frame but the older bonded Aluminum frame Treks (1100, 1200, 1400 series) that ran the rear brake housing inside the top tube used to rattle like mad on rough roads. A few pieces of soft plastic foam jammed into the toptube worked well to stop the rattle.
HillRider is offline  
Old 04-29-11, 06:51 PM
  #6  
Kimmo 
bike whisperer
 
Kimmo's Avatar
 
Join Date: Dec 2009
Location: Melbourne, Oz
Posts: 9,312

Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1270 Post(s)
Liked 495 Times in 357 Posts
Originally Posted by cyclist2000 View Post
My Bianchi frame says it has structural foam in it. Whatever that is.
It's awesome stuff. Very strong for its minimal weight... used extensively in composite construction.
Kimmo is offline  
Old 04-30-11, 04:10 AM
  #7  
MichaelW
Senior Member
 
Join Date: Feb 2001
Location: England
Posts: 12,948
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
You can get an chemical expanding foam for use as a filler for DIY. I think this is what Bianchi use.
MichaelW is offline  
Old 04-30-11, 06:02 AM
  #8  
HillRider
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 32,859

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

Mentioned: 38 Post(s)
Tagged: 0 Thread(s)
Quoted: 1671 Post(s)
Likes: 0
Liked 529 Times in 396 Posts
Originally Posted by MichaelW View Post
You can get an chemical expanding foam for use as a filler for DIY. I think this is what Bianchi use.
Many carbon frames are molded around a foam "armature" which remains inside after the epoxy in the composit is cured.
HillRider is offline  
Old 04-30-11, 07:30 AM
  #9  
byte_speed
Roadkill
 
byte_speed's Avatar
 
Join Date: Sep 2004
Location: East Tennessee
Posts: 858

Bikes: 2002 Lightspeed Classic; 2010 Pedalforce RS

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by cyclist2000 View Post
My Bianchi frame says it has structural foam in it. Whatever that is.
Structural foam? This is a carbon frame?

Does anyone know if it really adds any real strength to the assembly, or does 'structural' just mean they can't figure out how to get it out of there so they will pretend it helps?

On reflection, if the foam helps to keep the tubes from collapsing, that would let them make the walls a bit thinner.
byte_speed is offline  
Old 04-30-11, 08:11 AM
  #10  
Looigi
Senior Member
 
Looigi's Avatar
 
Join Date: Dec 2010
Posts: 8,951
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Likes: 0
Liked 8 Times in 7 Posts
Originally Posted by byte_speed View Post
On reflection, if the foam helps to keep the tubes from collapsing, that would let them make the walls a bit thinner.
This.
Looigi is offline  
Old 04-30-11, 11:32 AM
  #11  
LarDasse74
Guest
 
Join Date: Jul 2008
Location: Grid Reference, SK
Posts: 3,768

Bikes: I never learned to ride a bike. It is my deepest shame.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Skis and snowboards often have foam cores... I think they are just to prevent them from collapsing, and as the ski flexes under the skier, the top and bottom go into compression and tension respectively.

My experience has been that wood core skis are stronger (seen a lot more foam core skis broken than wood core), but the foam core are generally acceptable.
LarDasse74 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
AlexCyclistRoch
Bicycle Mechanics
22
07-06-16 03:37 PM
royalflash
Bicycle Mechanics
77
11-18-15 07:54 PM
kongolml
Classic & Vintage
15
08-07-14 06:06 AM
hyhuu
Road Cycling
4
09-02-11 08:21 AM
k2krafty1
Road Cycling
10
05-10-10 10:32 PM

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.