I heard somewhere that in racing there are serious bike mechanics who fill mountain bike frames with expansion foam to reduce noise, damp vibrations, and in some cases, actually make the frame stronger. But like anything in racing, it could be that this “upgrade” takes a lot of work, has limited gains, and could potentially ruin a very expensive frame. It could also be that very specific foam is being applied strategically—instead of, you know… a haphazardly applied $6 can of expansion foam from the hardware store.
So before you go and fill your carbon or alloy mountain bike frame with expansion foam, I’m here to test it out and tell you if it’s worth it!
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increase and decrease the weight og the bike half pound at a time and do the same experiment
from an acoustics standpoint:
the empty body/frame will resonate with certain frequencies and thus amplify them. It being essentially thin pipes, they dont resonate much, dont know about the material yours is made from. Also the frame isnt a uniform shape or even a voluminous body (see guitar), so the amount of possible resonating frequencies is less.
The dB meter was set to dBa, which is a perceived volume. The human ear hears different frequencies at different volumes. So the first test just could have had some random rock or jiggle make a higher volume in the 3khz range. Around 3khz is the most important part for understanding speech, so the ear is more sensitive to that, which leads back to the dBa setting on the dB meter.
When you filled the frame with foam, you acoustically made it a solid body. That body not being just a single material affects the resonance very much, especially when its filled with foam. Foam has a lot of air bubbles, different sizes, shapes, etc. Meaning it is very good at dampening sound.
TL,DR:
Foam DOES dampen the sound
The reason for the foam is to stiffen the frame for racing.. it has nothing to do with the so-called quietness.
the key to good science in repeatability. it did what it was supposed to, it is quieter.
That foam is "open cell" foam. That means it will hold water. Once moisture condenses in there it is very hard for it to get out. Oddly, what will be absorbed into a space far more easily than it can evaporate out. Therefore, every place where you sprayed that foam in that van is going to rust out. Trust me. I've been in the vandwelling community for about a decade, and lived in my van since 2018. I've heard nothing but terrible rationalizations from people getting ready to do it, and horror stories from people who did it 5-10 years previously.
What you have just shown me is that you are willing to say anything for YouTube content. I will therefore be filtering out your channel.
you could run the audio through a spectrum analyzer to see what (if any) of the frequencies diminished.
This actually gave me an idea, you see my wife has been mean and acting rude lately. She was OK with my little finger in her exit hole, but she drew the line when i put the straw like tube in.
Spray foam will trap moisture, just something to think about it you have a metal bike
ok after watching the whole video I think your research does not get to the end of it. I mean what are we talking about? This foam won't get your bike any faster but what does it do? I think it does more than the sound aspect you meassured. I think the interesting stuff will pop up when you look at individual parts (however this could be done). Let's talk about mechanical resonance where a little vibration of the right frequency can let to a resonance catastrophy. For a high end bike manufacturer it's all about weight to gain ratio. I think you are on a path to something. Take my like an sub.
7:11 no you don't. you just know that 'longer' sounds are more annoying to your ears and brain. you don't eliminate the peaks with this method but you will get rid of the internal accustic reflections.. or echoes. This is very interesting but overall it's the real internal vibrations that have to be blocked. Let's see, I'm not through the video yet.
Not that I’d recommend this to anyone but it’s worth pointing out that 2dB could be somewhat significant considering 3dB is a doubling or halving of volume.
But like the video says needs further isolation testing.
Doesnt this make the frame even stiffer?
I have never know anyone that wants there bike heaver. I have always tried to find lighter frames. What about just putting a few 1×1" squares of peel and stick sound proofing for car audio to the frame. It would I think add less weight and may have the same results as the foam.
Foam needs moisture to expand. So you at least need to spray some water inside the tube before. Or use 2 component foam.
Wait till the foam starts to crack and rattle in the frame 😂
wth? you ride not with silent hub. making all this pointless.
The forbidden whipped cream.
This seems like a total waste of time. I had a can of expanding foam explode in my shed on a really hot day. That was about five years back, and I’m still cleaning it off tools, windows, clothing, everything…🤣🤣
I got a Giant Stance that's making sounds that I don't like, and I can't find where's is it coming from x_X
Your really using the wrong expansion foam. You would want to use high density structural expansion foam. They use it in high end super cars with carbon fiber tubes to add rigidity to it and reduce road noise. I would think that any metal frame bike wouldn't need it.. but it could made a small like 5% difference in a composite or carbon fiber frame in it's over all strength.
Stupid video.
What was the weight difference?
Poor Oscar
I have 400 dollars I want a mtb am new to biking what should I get
Filling close tube its not good idea. Foam need oxygen to be harden, so i guess you have a lot of sticky unharden foam in your frame.
Majority of expansion foam is not water proof it acts like a sponge soaking up water. By injecting it into your bike frame you have created major rust problems in the future if of course the frame is made of steel, spraying this stuff is not a good idea.
Ok seth great video
But what about long term affect wont the foam eat away the frame frm the inside
I LIVE NEAR FAIRHAVEN STATE PARK AND SEEN KIDS ONE DAY HITTING A BIG JUMP ON TOP OF A Pier INTO THE WATER WITH A ROPE TIED ON AND LIFE JACKETS STRAPPED ON FOR Retrieve ,WILL FOAM FILL HELP IT FLOAT
Does it float?
This Video Is Like three stooges, But The Guy Is Only One ;D
Decibel measurement is not a linear scale…. 2 Db is actually quite a large difference, ( almost half as noisy in fact.)
Oh dear
I could give you a longer list why not to use it in your house,,
Fill every part of the bike with foam and tires or with another material
as someone that dose SPL audio for competition i can absolutely tell you that expanding foam dose deaden sound
Regarding filling tyres with foam, forget that, WHAT ABOUT FILLING THEM WITH HELIUM?!?
May possibly assist with floatation if you were to come unstuck into some deep water. Other than that, it appears to successfully kill time, cost money, and make a mess…
I was wondering more about vibration and feel, like the Spank vibrocore stuff. You'd think a frame full would do something noticeable
When I was a kid, we filled one of our friends bike handlebars with dog poo without him knowing, his bike smelt like sh*t for ages 🤣
Wth dude?! Why, just why?
But will it float🤔