BMX Stem Geometry - EXPLAINED
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- Опубліковано 4 бер 2019
- Edit* BMX Stem rise is actually measured from the bottom of the stem to the center of clamping area.
BMX stem geometry appears quite simple at first glance, and for all practical applications of stem geometry, it is as simple as it seems.
However, there is more than meets the eye and a lot to talk about in regards to BMX stems and their geometry.
Hopefully this video can help you make an educated decision the next time you’re in the market for a new stem!
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Dude you’re like a BMX scientist... and with a natural born teaching ability that’s miles ahead of the other youtubers who let their online personality get in the way of the information.
In the 80s we literally hammered thin metal slivers into our seat clamps and secured loose and stripped brakes to the frame with wire before each ride, the session lasted as long as the wire did haha! Pedals back then had cotter pins in them, if it took too many hits you’d end up with a slightly floppy pedal on one side .... (its no wonder I was so shit) - things have come a long way.
Hey thanks man!! I try to do my best and let my real personality be my online personality.
That sounds sooo crazy though. Wow. Sounds like a different world
Agreed! Edits are fantastic as well
Every time I need to find out something about BMX it always leads back to you. Honestly thank you for all your hard work
That's really really motivating to hear man, thank you!!!
longer stem = more stability but slower barspins/whips. harder to get into nose mannies but easier to hold em, shorter stem = more twitchy but faster barspins/whips, easier to get into nose mannies but bit harder to hold
Hey thanks for putting this in here! I didn’t want to mis speak in talking about it while making the video
@@Brant_Moore i wish i knew what i knew now when i was 14 haha, learning all about geo and how everything effects everything
It’s pretty crazy isn’t it?
@@Brant_Moore i know haha, i want the 36mm Madera stem next, currently on the 54mm. im trying to make my front end twitchy with 15mm deco fuforks, 75.75HT
That’ll definitely do it! Haha
Imagine that. The bike has to be one of the best inventions ever and look at how it has evolved. fantastic. Just the thought processing going into designing this stuff is amazing.
That was awesome Brant - very informative! Thanks for putting so much effort in. Hope your channel continues to grow - you deserve it-:)
Hey thank you!!! Trying my best to make the best possible videos! Really appreciate the kind words Mr. Pugwash!
Amazing video, you explained it so well, thanks !
Awesome video !! Really good job
Excellent, in-depth vid. 👍
Great videos keep up the good work !!!
Thanks man!!! I'll do my best
Great explanation, thank you for this video, learned something new today :)
Love to hear it!! Thanks for watching
Damn. Well explained bro. Muchas gracias
Always happy to help!!!
A beautiful cnc stem, it s a realy piece of art!
Thank you for this video, a true bike hero righ here.
Very cool video man keep it up. 👍👍🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥
Thank you man!!! Trying my best
This is awesome thank you!!!!
You’re awesome for being here to see it! Thank you!!!
That was awesome….thank you🔥🙌🤙🏻
Tuve que poner los subtítulos en español, pero aprendí, realmente en español no hay tantos vídeos que expliquen la geometría así que muchas gracias.
Dig these videos 💪👍
Fanatastic bro
Thanks so much!
good vid 👍
Thank you! Hope it helped you
Good video
Thank you!
I've learnt a lot.... Like.
If you know the reach and rise of a stem, you can use the Pythagorean theorem to calculate the extension.
(Reach x Reach) + (Rise x Rise) = (Extension x Extension)
I was wondering if the fork bore size is the same with all bikes? I have an OLD gt-bike and need a stem.
good video, would you really notice a big difference from 48-53mm?, when you buy a stem seperate do they usually come with the plastic top cap?
Hi Brant ! Do you know how the rise impact our riding ? I'm confuse with 2 stem as the same spec but different RISE.
Good video !
It puts your bars higher up which can help with back strain and give a different feel to riding. Whether or not it is good is up to the person riding
Also, I often hear that people would either change they bars for a 0.25" lower, or switch to a frond load. But they don't realise how lower a front load stem will keep their bars compare to a 0.25" lower bars. There might be more than 1" of difference. Anyway, I love frontload stem.
I got new bars but they are thicker then my old ones. The stem does not fit with them is that the new bars or just because they are bigger? And what is the most common diameter?
It would have been great to say that having a stem with a recessed cut out increase the rise of the stem, cause it will need and additional spacer to keep it to the same : (ex : fiend morrow V1 vs V2)
also worth noting make sure your fork compression cap clears the recessed out area, my buddy had an issue where he had to file his down a lil to get it to fit.
What are the most grip stem, my bars keep moving up and down no matter how tight I get em???
Thanks in advance
New stem and bars will probably solve that. Most stems are about the same in this
Hello if fork size 26mm what size stem can fit in? Pls help
Where are t1 stems available? I want one.
😎 👍
That Profile 40 stem is just ridiculous, but to each their own.
Hey man, great video, but I have one question - You say that the rise of the stem is measured from the center of the steering bore to the center of the handlebar clamp, in a different video a guy said to measure the rise starting from the Very bottom of the steering bore of the stem.
This has confused me a lot, because using your method here my Front load stem rise will end up in the negatives, but measured from the very bottom of the steering bore of the stem it will be about 7mm, which is what sourcebmx is telling me the rise of my stem is. So I'm just curious if you could inform me on which is the correct way or whatever is going on here.
Thanks heaps
Apparently my video is incorrect. Looking into things, the resources I used for that piece of information were incorrect as well. All bmx stems I can see appear to be measured from bottom of stem to center of handlebar clamp.
I can’t believe it took this long to figure it out
The weird thing is that it appears some stems are measured the way outlined in this video. How confusing. Practically though, there’s no reason to need to measure for yourself and not trust the info bmx companies are giving unless there is zero spec information from them
@@Brant_Moore Thanks heaps bro, you're the man. I am just doing up my bike and need to calculate the rise I currently have and what I will have with new parts to make sure it will be good.
Thanks again.
48mm stems all day 😤🔥💯
53mm here!
@Brant_Moore love your videos man. Great content and your knowledge of BMX is awesome. I want more BMX news videos!!
Really appreciate it man!! There will be one Friday!
53 for me.
Jacob James Im short and run a longer frame (20.75) so it feels good for me at 48 haha
Hey brant, any stems that you would recommend for techy- street riding? thanks .. charlie m.
Would depend on what you like to do. A shorter reach stem makes barspins quicker and can make the steering feel more reactive
@@Brant_Moore what might your idea be of a shorter reach stem
Quick question regarding stem bolts. Do you put grease on the bolts?
I personally do, and doing so got rid of some creaking on a stem in the past for me
use permatex anti-sieze like $8 for a bottle that will last you a lifetime at autozone
Yes, grease any metal on metal contact except on your bars, that’s just dumb
@@cbrizz Thanks man yes was bit of a dumb question. LOL.
Complete bikes I suppose are already greased up.
I changed my stem with a new one, how come my headset became loose? now it has a little play when i brake the front caliper. should i add a spacer? or add more millimeter coz i noticed that the stack height of the new stem is different from my old one.
If the stack height is lower on the new one it could be your problem. If that is the case, another spacer should help
Hey does anyone know what fit stem he is showing ?
Im actually a beginner in bmx and I want to know if any stem will fit on my bmx it’s a Sunday scout 2019
Yes any modern BMX stem from a major brand will work
@Brant_Moore ok thanks I was really worried about ordering something that wouldn’t fit
Joedan Collard good bike, I got the same one
Flaymezilla yeah i just bought another bike today getting it soon cant wait to do some
What size mm stem screws should I get?
Honestly I’m not sure how long they are. I feel like it would be a specific size that they all use
Ahhhh!!!!! math! Lmfao 5:14
Haha math can be fun!
Same stem FIT stem. 🤘
How do you like it?
@@Brant_Moore though man. Real carry the whole load. Oldstem best
Glad to hear it
Can someone help plz I've had the problem for years
So if you put your front wheel between your legs and try and turn my whole stem turns without the wheel and I can't get it central and can move while riding does anyone know the tools and the way to stop this?
I would take it to your local bike shop. There could be issues that aren’t obvious and can be unsafe.
@Brant_Moore ok thx
"bottom load" isn't really a thing, but HALF-LOAD is
So ummm. Rise is measured from the bottom of the stem to a horizontal line through the middle of the bars. Not from the middle of the stem. Please put out a video or mention this as you're misinforming a lot of viewers here.