Hey everyone and welcome back to another Tuesday tip where in this week's video
I'm going to be showing you how to tell if your BMX frame is bent more
specifically how to tell if the rear triangle on your BMX frame is bent and all you need to do this are the tools to
take off your rear wheel a piece of string that's long enough and
Something to measure with so let's get right on into it and show you guys what's going on here as you can see we've removed
The rear wheel which I don't need to show you how to do
And we've taken a piece of string and we've wrapped it around the head tube
through the dropout through the other drop out and then back around and tied it at the head tube and as you can see
I've put it underneath all of my braking components made sure that it's not wrapped around the chain and that there's nothing
Impeding things and that the only place the string is in contact with is the frame so that we can get accurate measurements here
We need to get accurate measurements because we're gonna be comparing two things and two
measurements on this frame to see if they're different and tell if the frame is bent and where we're gonna be measuring is from the
string to the seat tube and
if you think about it a
perfectly straight BMX frame should be
Symmetrical on both sides because it should be exactly the same on either side of the frame and either side of the dropout
So when we measure this, it should be exactly the same
So that's why you want to make sure if you have brakes or anything like that. Do you get the string underneath of it?
and that it's not touching anything else to change this measurement and affect it in any way because we need to make sure and be
Precise on this and with that let's just double check here. We've got it
We also probably want to make sure that it's in the same spot on both
Sides and that it's in the same spot on the dropouts
Basically anything that could affect this
Measurement in a way that isn't the straightness of the frame and I think I've got it pretty good here
And I actually have two frames here that are exactly the same so we can compare these
measurements and see and as you can see
I don't have the string on the other one yet because I wanted to run through showing you guys how to do that quickly and
We can time-lapse do that because I feel like it's pretty simple and it's probably already done
So let's get to measuring both of these frames and see if either of them have a bent rear triangle
Sorry for the quick camera change, but my phone was just not having this 90-degree heat either way though
We've got our tape measure now. So let's start taking some measurements and see what we come up with
We're gonna do this in millimeters just so we can be a little bit more accurate
so like I said
We're gonna be taking the measurement from the string to our seat tube. And if we do that in millimeters we get
about
34
Millimeters as you can see right here
Now it's a little harder
to fill measuring the other side, but we're gonna do our best here and as you can see
It is almost in the exact same spot at 34 millimeters
And that's really all we need to do to know that this frame is perfectly straight
So let's take it to the other frame and see what it gives us and as we can see here
this one is 34 millimeters as well and we can see here that the other side is 34 millimeters as
Well, and if our frames were bent here, we would have saw some sort of difference in these measurements
So there we have it according to the measurements. Both of these BMX frames are perfectly straight. I don't know about
Tolerances or anything like that whenever frames are being built. So I don't know if there's any variation there in the numbers
I just know that both of these frames have the exact same number on both
Sides of the frame when ever measured and I feel like that just means that they're perfectly straight
so with that being said
I'm sure there's other ways to measure whether or not a frame is bent and if you know one of them
Please leave it in the comments down below
But this method just seems so simple and just makes so much sense
And the fact that all you need to do it is to take off your rear wheel and have a piece of string as well
something to measure with
means that it's just accessible to just about
anyone and as soon as my buddy John quartz who recently started up work BMX frames told me about it and told me that I
Could share it with you guys?
I knew that I had to in hopes that it would just help someone
And if it did help you and you guys aren't subscribed yet hit the subscribe button down below so that hopefully we can see you
Tomorrow for another video. I want to thank you guys all for being here and watching and good. Bye