convert old bike to disc brake

[@johnthompson9602]

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.

[@rajin99]

you are great explain in detail. thanks for advice

[@jamesellis5549]

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.

[@carlinanderson2605]

@@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.

[@chucknoob7041]

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.

[@johnthompson9602]

@@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

[@ginginthing]

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.

[@fendipakeen7295]

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)

[@ginginthing]

@@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.

[@bobjonathon2669]

Hate people like this like actually shut up man so many "experts" in the comments

[@melcoeb]

damn. nice reply.

[@Mabaz]

@@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.

[@ASHMAN750]

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

[@b1gchr1s29]

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

[@renzoprias4157]

hahahaha

[@williamaubuchon4739]

The material he used was like, 20 gauge thick and he welded with a stick welder. I think it will be just fine.

[@b1gchr1s29]

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

[@chanthibcth9990]

I pray who ever reads this becomes successful in life...

[@rashmipal9454]

But why

[@allex7615]

Stfu

[@servana2901]

Thank you

[@theejoeylee]

Thank you. Touche

[@glemarquider7544]

I love you

[@picias0000]

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.

[@1trucxhondamov589]

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! 😀

[@tblue1904]

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

[@gilboston20033]

Me too, I had to go inside the frame to reach the pedals on my father's bike.

[@heriantomedan452]

Suwun tenan mas . . .wis entok elmu dikekke lagu maning . . uuenak tenan mas . . matur nuwun . . .siiip

[@antokoer7822]

Marahi kepingin . . aku .isih duwe frame Alpine STAR edisi tahun 1990 . . Kesuwun MasBro , sampeyan kreatip tenan

[@ECsponger2]

I really enjoyed the song near the end. Very peaceful.

[@rajin99]

thank you @ocripcurrent

[@johnq8758]

@@rajin99 more songs pls

[@fauzianwararifin3824]

Java language in this song. Fyi

[@star27996]

Song : Tatu from didi kempot

[@novantosagita8962]

love . song . java .

[@aliaulia3243]

Gara-gara sampean orang bule pada debat,keren modifnya om....

[@mwd21]

Love the chickens squawking continuously in the background

[@rajin99]

thank you

[@vijayanchomatil8413]

Roosters

[@h.j.channel51]

Keren om...yg komen banyak orang luar negri.....dan mereka terinspirasi dari orang indonesia....ga nyangka banget....

[@garbizzi6868]

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

[@dermomo3868]

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.

[@SomeAngryGuy1997]

@@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.

[@corymatthewsno1]

Super great thinking outside of the box! Much respect for finding a solution! Should clean metal before welding!

[@rajin99]

thanks for advice

[@jangidik6098]

Mantap mantap mantap mas bro, jadi inspirasi buat saya nge restorasi sepeda federal jadul saya... Salam gowes dari Bandung mas bro....👍👍👍👍👍

[@Jonmc511]

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..😊

[@honingholes7026]

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.

[@carlodominiclu2609]

Nice procedure.... really liked this and you inspired me to do this on my old Trek,

[@jameslefleur1970]

Nothing brings more satisfaction than giving new life to old things. Well done rajin!

[@johnbreza8968]

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.

[@shahrilmohd7829]

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...

[@vijayanchomatil8413]

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.

[@michaelmouse5210]

It appears from the welding in this video that neither has the guy doing the conversion.

[@vijayanchomatil8413]

@@michaelmouse5210 But he did it and that makes all the difference.

[@MrK67017]

At first the chickens were distracting but they grow on you . Very soothing song to wrap things up. Nice video.

[@siblack2336]

Ajiiiip...gowes ngga harus mahal ya om...yg penting bisa bikin kita sehat..

[@1trucxhondamov589]

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! 😀👍

[@sgomez3047]

Really enjoyed your video. Especially the part of you riding with your boy. And the music was great! Thanks for sharing

[@rajin99]

Thanks so much!

[@dimevans9543]

Man! You are Great! Enjoy life. You deserve it. Regards from Greece.

[@goukenslay7555]

there are disc brake caliper that go onto the tube of the frame, a gravel bike my coworker has this, no extra hanger needed, you just need to drill and tap holes for them

[@sidiqjamil4944]

Keren om, sangat kreatif dalam pengambilan video ada pengamen juga jd sangat menggambarkan susana desa yg ngangenin, salam dari Semarang om

[@rajin99]

terima kasih mas'e

[@giovano2685]

Itu pake uk ban luar brp mas e kok kliatan besar ?

[@peroduanippa]

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.

[@rifkiferliansyah8213]

Sing komen wong luar tok 👍👍👍😁😁😁 dasare jenius njenengan pak....

[@BerserkerNick]

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

[@rajin99]

Thanks for the tip

[@chucknoob7041]

Berserker Nick - Also clean the welding surface down to bare metal.

[@NoFretBrettCSSMBFF]

@@chucknoob7041 ... *BEFORE Welding...*

[@js4512]

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!

[@soesidpdp1900]

Mantab,banyak pujian dr orang luar krn simple dan tepat guna.

[@cameronalexander359]

Awesome job, dude. No more cooking your rims on long downhills or chewing out your expensive and inceasingly hard to replace caliper rims 👍

[@小头爸爸-s6v]

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?

[@walasinternet]

your videos are great and gave me an idea for a new bike from the old frame. your ideas are cool.

[@salahapa8075]

Konten yang mendunia kang.. Yg komen bule semua.. 👏👏👏👏👍👍👍

[@williammarshall4277]

This put a big smile on my face....well done.

[@davidq1164]

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.

[@MakanSehat45]

Sy selalu view vidio²nya,krn untuk restorasi juga speda² yg membeludak d gudang,cuma saja partnya dimana beli?sy kepulauan

[@memerwrld4097]

4:20 u should do gas welding for better pattern👍

[@brucewmclaughlin9072]

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.

[@ryurichardson6045]

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!

[@hatbpto5180]

Thanks for this! Life is great, isn't it?

[@santirtamartendano]

bangsaaat dancuuuuuuk !!! aku seneng video iki pooool!!!!!! Suara pitik dan closing pancen toooop!!! 🥰🥰🥰🥰

[@robertkelly1590]

That ukulele playing was lit!

[@angelrojasaburto1739]

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

[@mrifkikurniawan9380]

Padahal orang indonesia, chanel nya tapi jangkauan postingan orang asing semua. Kerennn bro

[@AK-um3us]

Good! You are best mechanic, rider boy best, singer the best!

[@marcojulli1300]

Huumm esa soldadurita no me confiaria demasiado, rescatable la felicidad del niño...!!!

[@nicklabelle9573]

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.

[@nicklabelle9573]

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.

[@einnarrodriguez4027]

Sigue sin problemas hasta la fecha ?

[@JR-sw2ru]

What a great conversion. Wish I could bang it out like that.

[@godfreytan1001]

Wah!! You are fantastic...👏👏. No Parktools here...o wait! maybe it was the welding equipment 😂😂

[@espguitars2992]

I really liked that part where the rooster said: errr er errr errrrrrrrr Good stuff very interesting 😂

[@1z4nagi67]

What did you use for your fork? 31mm or the 22mm one

[@gerardjones7881]

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.

[@ericcaira7338]

I have friends who have been biking for years and they say it's an awesome bike.

[@gafxt4414]

Q buen final!!!! !!! Saludos desde argentina!!

[@Rodrigo-j8n]

Hello, I want to do a job like this, but I'm afraid of damaging the chromoly frame and fork. What do you think?

[@jicelk5150]

Por fin un video que da el detalle de cómo hacerlo un genio

[@ian_ff]

por mas gente como esta

[@BuddyLAR]

Mantab, kreatif teruss tanpa batas manfaatkan apa yg ada

[@dastardlyman]

amazing. subscribed. i have two bicycles that have been converted to ebikes - your video has answered my questions

[@rajin99]

Great to hear!

[@markdixon392]

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.

[@rajin99]

thank you very much

[@Rozbujnik_Rumcajs]

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.

[@gaylorelchapo4750]

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 !

[@tjahjoprakoso1]

@ indonesia

[@novantosagita8962]

indonesia . java

[@tiozaodabikespbr]

Ótimo trabalho, vamos ver se o quadro aguenta a torção do freio sem quebrar.

[@eveclopes6133]

Mas nas bikes mais modernas o processo é feito diferente?

[@lostboy8495]

Ele podia ter tirado os pinos do v-brake

[@fernandofelipe4362]

@@eveclopes6133 sim a solda é bem mais bem feita

[@wilfredorobertohuamanafanc4876]

Mis respetos maestro 😊👏👏 grasias por tus conocimientos

[@ЕгорГалушкин-ф2д]

very good job, well done. Hi from Belarus!!

[@lancetah]

Great build. You may use some cable ties to secure those loose wires. Nevertheless, good job. Mantap pak rajin 👍

[@rajin99]

Thanks for the tip

[@carlos.5290]

Nice work. Would it be the same process for hidraulic disck brakes?

[@rajin99]

can also

[@walterdayrit675]

Yes.

[@emiliosagichnicht7521]

I expected wierd indian guy, this video is surprisingly cute and wholesome.

[@kajaning]

Hes not indian but in central java INDONESIA

[@Medievalfan94]

Oh boy, those welds xD You havent even sanded down the original paint. you just welded through it. If the frame does not fail from the changed load, the welds will... Nice idea, but certainly not practical and not safe by a longshot. But safety seems to be no issue for people who are wearing flipflops while doing metal work. Liked the relaxed style of the video though.

[@MatthewBishopCounsellor]

Fantastic job, mate.

[@darwinjones924]

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

[@guillermolopez5261]

me encanto el video... y mas aun el final con la musicaaa felizitaciones

[@ohgrijalva]

Excelente tutorial, rajin. Muchas gracias.

[@jojojo7333]

I'm still wondering why you didn't sand before welding... why.... Knowing you did it then or painting.

[@nurdinalulussatriani7239]

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

[@rajin99]

siyap nurdinadina dina next time bila sudah nemu sepeda untonya.

[@shahebmiah7724]

What tool did you use to merge the bike with the metal pieces?

[@feb_eff]

Saya tanya mas , apakah itu gag goser antara piringan cakram sama kampas rem ? Soalnya meleset beberapa milimeter saja sudah bikin gesekan antara piringan rem sama kampas rem

[@rajin99]

pertanyaan yang bagus mas'e.... itu tinggal setelan rem dan pemasangan dudukannya mas jadi usahakan itu lurus

[@alibwibowo6136]

Orang indonesia kreatifitas gada batas 👍

[@upward_onward]

Wow...Thank you so very much for this excellent conversion information. Indebted to you. I'm going to do the same.

[@azizjamet5729]

Seng komen kebbanyakan wong luwar pulau kabeh jos tenan mass lanjott

[@monkeyddrew6182]

Felicidades amigo buen video , saludos desde Perú🇵🇪

[@suradilikdi1915]

apik tenan .....!!! sing mbarang ikut ngetop nih....

[@ericgonzales854]

This is what I need to see today... very helpful and just grounded me. God bless you guys and Merry Christmas. Careful Lil Man😜

[@niasainreque999]

Se puede soldar aluminio y acero?

[@NaufalYT]

Mantaap bang, sangat bermanfaat.. Salam dari indonesia🇮🇩

[@1Hamba_ALLAH]

Good job...salam dari minioners tangerang

[@albertalejandromorales]

MUY BIEN AMIGO BUEN TRABAJO LO HACES VER FÁCIL PERO NO LO ES SALUDOS DESDE VENEZUELA

[@GARAGESXERO]

Cool video 👍🏻👍🏻👍🏻👍🏻 with the braking force being better with disc brakes will front forks twist or maybe weld breaking ????

[@rajin99]

thank you for the advice

[@tonyconnors1342]

very impressive and looks great works perfect.

[@rajin99]

Thank you very much!

[@wsurjana]

Sederhana n manteb om keren 👍🏽👍🏽

[@iamalavalamp]

Sangat kreatif dan ketrampilan. Lagunya asyik juga.

[@rajin99]

terima kasih

[@peterrobertbowers7639]

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.

[@gerardjones7881]

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.

[@nazrinnazrin8150]

Total restoration?

[@HarisMaulana14]

Kualitas video mantul om, kirain dari luar loh, eh kok boso jowo ngomonge, mantul pokok.e om