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convert old bike to disc brake
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- Опубликовано: 19 апр 2020
- convert old bike to disc brake
thank you for visiting on my video and my channel. this time i try to convert rims brake to disc brake on my old bike. hope you will entertained with my video. please comment advice and critics.
#bike #bicycle #discbrake
mitrokono@gmail.com
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You converted a safe bike into an unsafe bike. The frame and fork pipes you soldered your caliper supports on, were NOT designed to handle the force the disc calipers will put on them ! It's pure physics. The braking torque applied on the wheel (when you brake) is about the same (disc brakes don't stop the bike faster than new & well tuned rim brakes). Torque = Force x (distance from the center of the wheel). But the disc brake pads apply the force WAY closer to the center of the wheel (on the small diameter disc), than rim brakes (on the big diameter rim). So at the same torque, the force applied by a disc brake pad on the frame, must be WAY higher than the force applied by a rim brake on the frame. Also multiply that big force by two, because a disc brake applies the force only on one side of the frame (a rim brake has brake pads on both sides of the wheel, so the braking force will be applied on both frame bars on both sides of the wheel). The same thing for the front brake. A fork failing while hard braking is really dangerous. My advice: If you can, revert quickly to rim brakes. If you can't, cut that bike in pieces, and throw it in garbage. Don't let your kid ride it. It's dangerous. I like how you sing, and how you love your kid, that's why I spent my time to write all this.
you are great explain in detail. thanks for advice
I could see that for forks but there is no difference in factory mounts for rear disc and his ,except that he arc welded instead of tig or mig.
@@jamesellis5549 it's not the welds that are not safe my dude.
It's that the bike itself was never designed for the disks in the first place, like the fork legs themselves. What happens when a modification like this is done is that inevitably the fork will bend of break (same with the rear), and more than likely fuck up the user. It's totally possible it will be fine, but I wouldnt risk my life just because someone told me disks are somehow better on a bike like this than v brakes.
Carlin Anderson -
I’m thinking about the leverage points and I think the three points to consider are: tire to ground, hub center, v-brake mounting point or fork/frame point. Seems that the forces will end up being distributed close to the same. With the kids weight and braking power, no problem.
@@chucknoob7041 you must be American. Only Americans think they are smart, when they have ABSOLUTELY no idea what they are talking about. Like Trump farting ideas about how to cure covid-19. Mankind laughs at you man. Those points you mention don't matter at all. The only thing who matters is the force applied on the fork (at front) and frame (at rear) at the caliper attachment points. I think your brain will finally start getting it, when you will see the following fork failure, caused by disc brakes installed on a fork not designed to survive the high forces disc brakes put on it - to get the same braking torque performance the old v-brakes were getting anyway ... since ages ago. This is the link:
cozybeehive.blogspot.com/2010/10/braking-induced-fork-failure.html
I'm a retired aerospace stress analyst that analyzed every type of welded tube structure on aircraft. I also am a licenced faa certified airframe mechanic.
Just by observation of this welded bracket conversion, I'd say it is a well done installation and the loads that are going into the brackets by the calipers during stops are directly into the centerline if the tubing with no offset bending moments. Therefore the backup structural tubes are more than adequate to react any braking loads over the 4" of distributed bracket loads. Since the rear brakes react about 30/49% of the entire required braking force, the bending load into the rear down tube at the rear bracket attach location would be less than 200 pounds by rough calculation distributed over the 4" bracket. Steel bike frames are typically made from chrome moly steel which have about 125 ksi FTU and about 100 ksi outside of the HAZ of a weld when annealed. The Fty an = about 60 ksi. The bending moment from worse case 300 lb at this location in the tube with fixed ends would be PL/12 = 300x 15"/12 = 375 in-lb. Stress = mc/I, where I for 1/2" tube with .050 wall = about 0.002 in to the forth. So stress= 375 x .25 / I.002 = 46,875 psi. Factor of safety = 60/47-1 = +0.28. yield. This conversion is good. The front forks have almost twice the bending inertia with 3 times the load of the rear bracket. Therefore good by inspection.
This is your Lockheed style stress calculation factor of safety.
So please don't say this is an unsafe conversion. If u do, plz show your calculations that prove other wise.
Great trusted calculation sir👍have done this to my old steel roadbike too, everything work good. And i still dont find any problem in my fork. (1 years used)
@@fendipakeen7295 Only thing you might want to consider is when you arc weld two pieces of steel together like you did with the bracket and the bike frame and the front fork, is to heat that weld area with a touch to about 800 degrees (dark orange glow) and let it air cool. The arc welding (at the weld and slightly outside of the weld ) has hydrogen embrittlement and is prone to cracking When the weld area is heated, it relieves this brittle area and makes the metal softer in that area less likely to crack at or near the weld. It's called metal annealing. It is much safer to gas weld steel tubing and brackets to it because the method incorporates annealing just from the heat of the weld.
Hate people like this like actually shut up man so many "experts" in the comments
damn. nice reply.
@@ginginthing Hello, if I might ask you a question. I'm considering learning to weld in order to start building steel frames for bicycles. I'm at the first stages where I'm doing research and found that vintage steel frames were welded together with brazing and flux. I searched around and found that it's a very messy process, and liked the cleaner aspect of TIG welding. So my question is, in your opinion, and as a professional who understands this kind of thing, which is the best method to ensure my frames will have the best quality welds? TIG, Brazing, or another one I haven't mentioned? Thank you in advance.
The song at the end felt kinda like the end of the world song of the people that's leftover and just happy to be alive and thankful
What I love about this post is the practical simplicity of it!
Here I am, seeking to rent time on a cnc machine, making out measurements on a computer and considering buying engineering tools, all because *I love my bike* and I thought the switching to disc brake requirements was totally both unfair and unnecessary to a *loyal and dear old friend/my bike* !
Willing to spend $3000 on my ❤ than $1000 for a new one! 😀
That welding on those mounts is the finest best ever welding ive seen, absolutely amazing, could hold ten ton of force no trouble at all
hahahaha
The material he used was like, 20 gauge thick and he welded with a stick welder. I think it will be just fine.
As someone who is qualified welder to 6gr standards im well aware 1 inch of weld will support 1 ton in weight if for one its good quality weld and not a load of snot and spatter clinging to a bicycle front fork tube no more than probably 2mm thick not designed to put up with braking forces, accident waiting to happen this pos bicycle
Gara-gara sampean orang bule pada debat,keren modifnya om....
Magnífico trabajo. Eres un artista.
Yo para dejar el trabajo bien fino aseguraría la camisa del freno delantero a la horquilla y quedaría mejor aún.
I pray who ever reads this becomes successful in life...
But why
Stfu
Thank you
Thank you. Touche
I love you
Marahi kepingin . . aku .isih duwe frame Alpine STAR edisi tahun 1990 . . Kesuwun MasBro , sampeyan kreatip tenan
I'm an Italian to English interpreter and I can tell you that those welds are OK, if they do happen to break during use the solution is easy, just weld them again.
Suwun tenan mas . . .wis entok elmu dikekke lagu maning . . uuenak tenan mas . . matur nuwun . . .siiip
Absolutely the best bicycle disc brake conversion video hands down .... Great job ! Ill be using the same exact technology for my motorized mountain bike ... Thanks
You should keep in mind though that a rim brake frame isnt designed for the forces disc brakes put through it. Especially on a motororized mtb the brake forces are pretty high. You might bend your seatstay and/or fork leg.
@@dermomo3868 The bending seatstay issue could be avoided by welding an extra support between the seatstay and chainstay. The metal he welded to the frame also seems too thin to fully withstand the stress from braking.
Super great thinking outside of the box! Much respect for finding a solution! Should clean metal before welding!
thanks for advice
Mantap mantap mantap mas bro, jadi inspirasi buat saya nge restorasi sepeda federal jadul saya... Salam gowes dari Bandung mas bro....👍👍👍👍👍
Nice procedure.... really liked this and you inspired me to do this on my old Trek,
Love the chickens squawking continuously in the background
thank you
Roosters
I really enjoyed the song near the end. Very peaceful.
thank you @ocripcurrent
@@rajin99 more songs pls
Java language in this song. Fyi
Song : Tatu from didi kempot
love . song . java .
Haha! That's they way I've done my STEEL FRAME brake conversions! I used to use them eyelets and screwed them on the rear triangle. Works awesome too! 🤙🤙
Can't beat the $29.99 brake kit. I love them components. They are just as good as shimano..😊
I remember the days when I used to ride a bike way bigger than my size , just like the kid at the end , those were good days
Me too, I had to go inside the frame to reach the pedals on my father's bike.
For those that say use a mig welder, maybe he hasn't got one, he could buy one but if he wanted to spend money he'd probably buy a new bike with disk brakes already fitted. He did a great job with what he had.
Really enjoyed your video. Especially the part of you riding with your boy. And the music was great! Thanks for sharing
Thanks so much!
As far as any engineering dangers, I will simply weld a buttress from the chain stay to the set stay for *support* .
Thanks, great video! 😀👍
Cool - I need to put a front brake on a 1970's cruiser conversion to ebike and it only had 1 brake, this solves my problem. Nice production loved the chickens and the song at end.
Mantab,banyak pujian dr orang luar krn simple dan tepat guna.
Thanks for this!
Life is great, isn't it?
Outstanding job! I also changed my fork and hub and installed a disk brake. This is a great idea! I can solder, but I've never welded before.
It appears from the welding in this video that neither has the guy doing the conversion.
@@michaelmouse5210 But he did it and that makes all the difference.
Sing komen wong luar tok 👍👍👍😁😁😁 dasare jenius njenengan pak....
Awesome job, dude. No more cooking your rims on long downhills or chewing out your expensive and inceasingly hard to replace caliper rims 👍
Just by observing at the welded part , i barely consider the finishing quite impressive.. this man has proof he is competent n has completed his tasks very well...
My thought maybe he was somekind like welder or foreman who experienced working offshore longtime ago...
At first the chickens were distracting but they grow on you .
Very soothing song to wrap things up.
Nice video.
Ajiiiip...gowes ngga harus mahal ya om...yg penting bisa bikin kita sehat..
Keren om...yg komen banyak orang luar negri.....dan mereka terinspirasi dari orang indonesia....ga nyangka banget....
Que buena onda tus videos yo cuando hera niño mi papa me dio una vici igual a esa pero sin frenos de disco ovio jajaja y anduve igual que ese niño con una sonrisa de oreja a oreja muy buenos tus videos siga así 👌👏👏👏👏👍🙏 saludos y salud desde Tepic nayarit México
Man! You are Great! Enjoy life. You deserve it. Regards from Greece.
Konten yang mendunia kang..
Yg komen bule semua..
👏👏👏👏👍👍👍
4:20 u should do gas welding for better pattern👍
This is super cool, next time turn the amps down on your welder and go slower, you'll end up with a stronger and cleaner weld
Thanks for the tip
Berserker Nick -
Also clean the welding surface down to bare metal.
@@chucknoob7041
... *BEFORE Welding...*
You guysforgot about cleaning the flux off before continuing the weld! Never weld on top of flux! He even had the grinder with a wire wheel to do it!
For the rear brake, i believe it is pretty safe to do so, the brake force is so much weaker than on the front one -- the harder the brake the more weight thus more tyre grip shift to front wheel.
I would not play with the front brake though.
Good! You are best mechanic, rider boy best, singer the best!
Me encanto ver el procedimiento del trabajo, y me gusto ver otra idea para mi bici por lo del cambio de velocidades ya que lo tengo con la rueda y no como la tuya, voy a ver si puedo hacerlo
ono seng nyanyi lagune didi kempot.
ambyar...tenan.
Nothing brings more satisfaction than giving new life to old things. Well done rajin!
Padahal ono ragum, tapi ngebor e nganggo tang diidak, jos tenan😂
amazing. subscribed. i have two bicycles that have been converted to ebikes - your video has answered my questions
Great to hear!
Ahhhh the comment section where all the welders hang out and comment about something but fail to post videos of how to do it right? Come on guys get your videos out and show us how to do it properly?
My frame NEEDS disc as my new wheels are disc only. I would use mig because i have some experience with thin welds . Arc is too ticklish for me to try. I like how he decided to make his own parts and shows how.
I really liked that part where the rooster said: errr er errr errrrrrrrr
Good stuff very interesting 😂
ignore the drama queens, you did just fine.
A steel frame is plenty strong enough. And for the boneheaded, motor bikes only have one brake disk on one side of the wheel. Just shut up.
Keren om, sangat kreatif dalam pengambilan video ada pengamen juga jd sangat menggambarkan susana desa yg ngangenin, salam dari Semarang om
terima kasih mas'e
Itu pake uk ban luar brp mas e kok kliatan besar ?
Seng komen kebbanyakan wong luwar pulau kabeh jos tenan mass lanjott
I just did this on my walmart beach cruiser with a 49cc 4 stroke engine.
Bike originally had no front brakes, just rear coaster brake, not effective with a powered bike.
I bought an adapter bracket but it kept working loose so I stick welded it to the fork, worked out perfect.
A cheap stick welder will do this, 6013 electrode rod is ok. Make sure the frame is steel ,not alum , try a magnet duh.
apik tenan .....!!! sing mbarang ikut ngetop nih....
Wah!! You are fantastic...👏👏. No Parktools here...o wait! maybe it was the welding equipment 😂😂
very impressive and looks great works perfect.
Thank you very much!
Wow...Thank you so very much for this excellent conversion information. Indebted to you. I'm going to do the same.
Huumm esa soldadurita no me confiaria demasiado, rescatable la felicidad del niño...!!!
your videos are great and gave me an idea for a new bike from the old frame. your ideas are cool.
This put a big smile on my face....well done.
I love this vieo.
I'm in love withe the song at the end, it takes me to .. i dont where. But it's a good place !
@ indonesia
indonesia . java
keren mas, ini buat duduK ANE REM CAKRAM YA. RESTORASI SEPEDA UNTO DI BUAT MODEL GAZELL
depan ada keranjang, tapi tidak ikut numpang di setir depan sehingga tdk membebani setir
siyap nurdinadina dina next time bila sudah nemu sepeda untonya.
Padahal orang indonesia, chanel nya tapi jangkauan postingan orang asing semua. Kerennn bro
bangsaaat dancuuuuuuk !!! aku seneng video iki pooool!!!!!! Suara pitik dan closing pancen toooop!!! 🥰🥰🥰🥰
super cool convert! I just have a question about the welding part, i dont know anythig about building bikes or welding, but could the heat from the welding affect other parts of the frame? , if it could affect the frame, is it possible to prevent it with like covering the frame with some wet ice cold towel or something?
Интересный ролик.
Для тех кто захочет повторить, ХВЗ свои рамы не варил, а паял.
Кто захочет сделать то же самое, пользуйтесь автоматом. И учтите, трубы рамы очень тонкие.
Best video ever. Very entertaining.
very good job, well done. Hi from Belarus!!
Ótimo trabalho, vamos ver se o quadro aguenta a torção do freio sem quebrar.
Mas nas bikes mais modernas o processo é feito diferente?
Ele podia ter tirado os pinos do v-brake
@@eveclopes6133 sim a solda é bem mais bem feita
Felicidades amigo buen video , saludos desde Perú🇵🇪
Q buen final!!!! !!! Saludos desde argentina!!
Its perfect man so awesome we can just do it at home
good luck
What a great conversion. Wish I could bang it out like that.
That ukulele playing was lit!
Por fin un video que da el detalle de cómo hacerlo un genio
por mas gente como esta
Thank you for posting. I enjoyed watching this. With some adjustment to the welder, and some practice, you could go a little slower and get deeper penetration... making the bond stronger. I appreciate the time and effort to record and edit the video.
thank you very much
With stick welding and metal so thin as 1mm and less, there is constant battle betwin keeping arc alive and not burning hole in bike frame.
This is what I need to see today... very helpful and just grounded me.
God bless you guys and Merry Christmas.
Careful Lil Man😜
Sy selalu view vidio²nya,krn untuk restorasi juga speda² yg membeludak d gudang,cuma saja partnya dimana beli?sy kepulauan
Great build. You may use some cable ties to secure those loose wires. Nevertheless, good job. Mantap pak rajin 👍
Thanks for the tip
Fantastic job, mate.
Nice work i like this idea you so very geneus
Nice conversion, my frame is aluminum so I would wire weld (MIG) mine but the process is identical. I might give it a go. Thanks
Nice work I see quick and easy no messing around , same way I would do it , although I would add a brace in the rear triangle and maybe something more for the fork if I feel it needed it.
And as far as people saying it’s not safe , good thing they won’t be riding it. Way safer than those cheap adjustable brackets on Amazon.
Hello to you from Ukraine. Great videos! Please tell me this is the music at the end of the video?
javanese music by didi kempot "TATU". thanks roman
Maybe you didn't know but there are adapters kits for retrofitting disc brakes on an old bike :)
yes my friend. that's taste.
love the song i remember my childhood memories
I have friends who have been biking for years and they say it's an awesome bike.
Kebetulan sekali baru slesai restorasi sepeda jaman smp th 2001,prsis gini frame nya, rncana pngn upgrade cakram jga, bisikin biayanya donk om? &Bkin video upgrade garpu depan pake yg shokbeker jga donk om!
Sangat kreatif dan ketrampilan. Lagunya asyik juga.
terima kasih
me encanto el video... y mas aun el final con la musicaaa felizitaciones
Mantaap bang, sangat bermanfaat..
Salam dari indonesia🇮🇩
Hello, I want to do a job like this, but I'm afraid of damaging the chromoly frame and fork. What do you think?
Apik mas garapan mu,
mugo makin sukses mas 😆👍
Sederhana n manteb om keren 👍🏽👍🏽
Good job...salam dari minioners tangerang
Te felicito chino
Ni orang bikin Vidionya kok keren sih... Amazing lahh
Nice work but that front fork will fail over time. It was not designed for the stopping power of disk brakes. Be careful
Thanks for the tip my friend
John Greene -
Those forks are designed to handle a lot of force. I think people underestimate the amount of force with rim brakes. It’ll be fine.
This seems to be a job well done! Although you would be better off.....changing those mechanical disc brakes for hydraulic. These hydraulic disc brakes are 10 times better. You will see & feel the difference, when braking.
i only wish i could do the same with my bike...on the back wheel... as shown in my 4 second video clip.
The front wheel disc brake can be very easily, changed over for a hydraulic. Can’t wait!
Thursday am at 07:28H. 1st April 2021. U.K. 🇬🇧 Southampton.
Mantab, kreatif teruss tanpa batas manfaatkan apa yg ada
Good job and cool song! Greetings from Russia :)
thank you
Mis respetos maestro 😊👏👏 grasias por tus conocimientos
buen trabajo si te quedo bien nomas que aplicando soldadura destiemplas el cuadro y lo haces fragil y se puede romper de ahi donde lo soldadte