How to Upgrade Bottom Bracket to Sealed Bearing (6903 2RS)
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- Опубликовано: 11 сен 2024
- How to Upgrade Bottom Bracket to Sealed Bearing (6903 2RS)
Hello Viewers! This short video clip is all about upgrading or converting loose bearings found mostly in vintage bike to a SEALED or CARTRIDGE one. The bearings are 6903 2RS which I bought through Shopee. You may see below shpee links to know where I bought bearings and bottom bracket spacers.
Shopee Link
Sealed Bearing (6903 RS) - invol.co/cl4ktr5
Bottom Bracket Spacers - invol.co/cl4kts8
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Cool experiment. My personal experience though is that loose bearings (held in a cage), packed with the correct type of grease, and properly adjusted, are usually smoother rolling and have less friction than sealed bearings (or a completed sealed bottom bracket assembly). You've swapped the work of re-greasing bearings for just swapping in a new sealed bearing units... but either way, in the future, the mechanic is still required to service the bottom bracket. All bearings wear, and eventually wear out.
Exactly, I took out the balls from the cages and put them in with a lot of grease and few balls more. I set the cups properly and they spin great, much better than my XT bottom bracket on my modern bike
Thanks for the info!
I have the opposite experience. I find that sealed bearings spin more freely compared to ball bearings. Numerous videos of this exist comparing wheels that have sealed bearings and ball bearings. However, one of the big reasons I switched to a sealed bearing bb is for the weight savings.
I used to convert all my old bikes to sealed bearing cartridge bottom brackets. After a few failures of the beaings I returned them to the original loose ball and cup bottom brackets and invested in a bottle of ball bearings for my spares inventory. I also use synthetic wheel bearing grease for boat trailers, I'm not sure if it's really any better but I feel better about riding in wet or muddy conditions.
I feel that this is a bad idea for many reasons. The bearings you are replacing are 11 1/4" (6.35mm) ball bearings with a sealed cartridge bearing. While this hack reduces maintenance it will decrease the service life since there are less bearings in these and they're smaller so they cannot take as much load. Improperly installed, the cartridge bearings can fail prematurely since they are designed for radial loads and very little, if any, axial load. There are sealed cartridge bearings that are made to take an axial load (there's an arrow or "out" etched on them to show how to install them properly) but those are not common.
You're needing to mount the BB cups about 5mm further out reducing their contact with the bottom bracket shell. Think about this: your entire body weight is resting on what little threads are left and if you stand while going over bumps multiply that by a factor of at least two if not more. This can lead to damaged threads on the bottom bracket shell which would make installing a new bottom bracket difficult or impossible, which would render the frame useless.
I don't know how tight the tolerances are for the bearings sitting inside the cups nor do I know the tolerances for the bearing sitting on the spindle but I'm fairly certain that they're fairly loose. That can cause wear on both the cups and the spindle. Not sure how long this system will last under real use.
Some crank sets use bottom brackets with short spindles and this modification would not work with them, though, admittedly, they're newer systems and the bottom brackets are probably already using a sealed cartridge system.
As an alternative, buy a sealed cartridge bottom bracket. They're fairly cheap and they're made to work with the bearings properly. They will sit completely inside the bottom bracket shell like they were designed to do minimizing the stress on the threads of the bottom bracket.
Actually it is a bad idea since the crank spindle is not a tight fit for the bearing. I've done this kind of conversion but on hubs. The axle was damaged by the bearing since it got a loose fit (less than 1mm) now the wheels are wobbling no matter how tight the bolts is. Also you can get a brand new seald bearing bb for like $3
The original bearings in good condition & well greased should have less friction than sealed would.
Sealed cartridge is the way to go for a BB upgrade. For under $50 you have a reliable smooth alternative to loose balls.
Did no body listen he said its an experiment to see if he could do it chill out will ya frig me
@@mtb0519 if you read the responses that are saying “great idea. I’ll give that a try” do you think that people are experimenting?
i have tried it before with the bearing 3903 with my old thunderbird BMX frame. then i sent to my local machine shop to modify the caps and BB axle to fit perfectly without the need of the spacer or washer. now more than 20 years i still use the same caps and BB axle and change the catridge bearing whenever i needed or bad. it was the best from that time and cheaper too.
Yan din naiisip ku pabawasan ung loob ng cap para magfit ung bearing since curve ung stock na caps.. much better kesa lagyan ng spacer ang laki kase ng space baka madali pa ung thread at magloosethread...
You may not that advertising accent but you did it fast and practical with no special tools that cost more than a bike so for that I'm going smash the like button ✅ great stuff
thank you my friend! i just bought the specified bearing at a local shop and i only need to make spacers. thank you very much, have a good day!
Glad I could help!
You can just change it to sealed bearing BB unit. The process will be more simpler and less maintenance
It's great experiment, I've done it before and yeah after it gets used as much, the bb cups will come off because of the threads of the cups doesn't have enough grip on the shell.
Well it was a great way to cycle without much of a side play or wobble
Well it's great though, nice content
Thank you brother!
This video is a great help! Thank you!
Welcome bro!
Sealed bearings aren't menat for use with loose bearing cup races. The bearing system in a bottom bracket with cup and spindle is meant to be a floating bearing system. The bearings themselves are not meant to be fixed in a non-moving position, which creates more friction by not doing the job of handling axial loads. You wind up having to actually do more maintainence due to quicker bearing wear due to friction because the bearings won't float in straight line anymore and will move side to side in the cartridge, because of the fixed position in the cup. This is why bearing races in loose bearing systems are rounded, including the spindle edges, which is also going to wear out the bearing cartridge, because it's not designed like a flat spindle, it has a rounded concave step meant to be an inner bearing race.
Great video 👍
RJ the Bike Guy ng Pinas🤟
To be honest po sir sya ung ginagaya ko 🤣
Matic subscribe na ako sa channel mo idol...hahahaha
Maraming salamat sayo idol!
you can use an assembled seal bearing bottom bracket there is a 110mm bottom bracket for sale that fits a vintage bike instead of experimenting
Nice experiment, but It'd be a far better idea to simply replace with a purpose designed sealed bearing bottom bracket. What you did there fucks up your chainline completely.
Better go with dedicated bike cateidge BB, much safer for the bb shell and the rider.
Good idea! If it works in the long run without problems then congratulations.
Yes it will
Good video and cool looking bike . 👍
Glad you like it!
Good job sir napaka laking bagay sa mga naka budjet bike hehe ✔️
Salamat sa suporta sir! 🥰
You just added more weight to the BB. That type of BB is already in the 300g range. There is a reason Shimano and Campagnolo use ball bearings with a cup and cone interface in their wheels and the BB would have the same benefits, it just spins better with less friction and therefore would last longer. You just have to properly maintain the bearings which I consider fun because I like to work on my bikes.
If you can afford instruments. Not anyone has enough money to pay for maintainence and nobody is going to rent you an instrument to remove the crankshaft, becausr it is easy to break when mishandled.
So,its been 10 months since you installed this setup,would like to know how been its doing for you,i have two personal vintage bikes to work on following your answer.
Regards
Ravi
I have been looking to do a sealed bearing upgrade on a few of my old bikes. If you’re doing a full restoration, it makes sense to upgrade components that need maintenance with newer technology, especially when it is invisible when installed. I’ll order a few spacers and bearings and convert all my old riders when I get a chance. I think the bearing size is 17mm ID, 30mmOD and 7mm wide, I might find one of my old bearing books and see if I can find something with a 5mm width, however, 6309 is a very cheap and easily obtainable bearing, so an alternative might be too expensive. Great video!
Yes, sealed cartridge bearings aren't perfect. They can be, or possibly be penetrated by external sources where they will become rusty in the inside, but of course they will perform well if you grease them up and clean your bike regularly...
Disculpe, pero no hay un error en mencionar rodamiento 6309 en ves de: 6903?
nice slide fit 😉 saktong sakto great idea👍
Excelente idea, gracias por compartirla
gracias hermano 😊
I think much better solution is to install cartridge instead old shaft with two bearings. Yes, this is much more expensive but once you install a cartridge and you will forget about this problem forever.
Ayos idol
Salamat idol! 😊
Thanks for sharing the
galing approved
Got em thanks
Genial vou fazer na minha biblioteca aro 20
anos 70 caloi berlineta.
Parabéns pelo canal
Brazil
Obrigado irmão
- Philippines
Não dá, os da berlineta é caixaria 40mm e de chaveta, o eixo do meio é liso, ele não tem essas abas que seguram o anel nos cantos do eixo. Pra tu fazer isso tu teria que arruma um jeito de embuxa o quadro da berlineta pra poder colocar uma caixaria de eixo ponta quadrada igual esse do video
Nice thanks
Thank you too!
Me resolviste la duda en el momento preciso, muchas gracias y saludos.👍
Amigo estoy viendo este video y me ayudo como a ti y dónde puedo conseguir estos rolletes de bielas de bicicleta dice q son 6903- 2RS estoy buscando nadie me dice . Me puedes ayudar por favor dónde puedo comprarlos rolletes para el sigueñal
Tq
If a shorter middle shaft is used, there is no need to put washer in between. At the same time, it does not keep the gear adjustment in this way. The reason is that the crankset is too far out.
There is no suxh thing as a shorter spindle as they are all designed around the ubiquitous 68mm bottom bracket shell
Goods tol salamat sa lahat
Walang anuman po! 😊
Whenever i pedal harder i hear this like birds tweet i dont even know what is the problem maybe 1 of the bearing brakes???
Good jobb
Nice
galing sir
Thank you so much!
*For who don't know, this is an old cup and cone bb..so it needs correct bearings's adjusting with special tools, to prevent hard or loose rotation of axle and pedal*
Welcome idea. ❤️❤️❤️
Thank you!!!
Bad idea. Use a sealed bottom bracket instead. The shimano un-26 is my favourite
Gracias por enseñarnos 👍👍👍👍👍👍👍👍
Indonesia tank for you
Your welcome brother!
Okay ganda naman nyan pwdi ba sa lahat bike yan idol
How about converting headset bearings? Can you do 1 video? Thanks!
I will in the future :)
Nice idea sir ..
Salamat sir!
Me watching at 0:39 in the morning 😂 baka may ball bearing to sealed bearing convertion ka ng hub sir ikaw lang napanood ko na gumagamit ng caliper eh
Cge po try po natin
Niceeeee
Thanx boss…it’s a big help because i need to upgrade bearings on my BB.if this 6903 2rs is for BB,may i ask if you have an idea what sealed bearing is for rear/front hub? Ty 👍🏼
Yes there's some who convert their axle to sealed bearing but requires a shim to fit in
@@CoggieBike thanx for the info Master... 👍🏼👍🏼👍🏼
Which one gives you less friction, BB or sealed?
thanks lods
Welcome 👍
❤️❤️❤️
New subscribers lods
Salamat brader!
Sir saan kita pwdi makuntak para mapakita ko mtb bike ko na standard frame. Gusto ko kasi ma upgrade sa sealed bearings ang front/back at bb.
Kaso.ang problem baka.mali ang mabili ko.
pwede po kaya ito sa standard bakal na mtb po ? maraming salamat . more power sa channel po
Yes po pwede po
What about alignment of the front and rear chainrings? I mean the bottom bracket is wider now.
I knew someone's gonna ask this. The alignment is not affected since the spindle is still on its original position... The BB cup is independent with the spindle :)
@@CoggieBike cool vidoe though.
Thank you brother! 😊
middle shaft bearings caught very few teeth. tooth structure of the frame is broken
Sir pede ko ba palitan sealed bearing bb yun bike ko standard frame chaka ano po sukat ng 3x.
Hindi naman ba affected boss yung shifting dahil mas na-move palabas yung front chainring tapos no adjistments sa cogs sa likod?
Yung BB cup lang po ang na move sir hindi ung spindle... Nasa original position pa rin yung spindle nya kaya hindi affected ung chain line... walang effect sa drivetrain
Bad idea.... Masisira lang ung thread ng bb sa frame.... Much beater pa magpalit kanalng ng bb which is sealed bearing na.... Mush safer than ur idea.... Kukunti lang ung nakakapit na thread d sya advisable Only for expiriment but not helpfull.
Is it possible to do with the wheels?
IDol libre moko pagandahin mo bike ko HAHHHAHAHHAHAHH
Sir pwede Kaya palitan ang cotterless axle bb to hollowtech crank????
Can an Isis drive bb be replaced or upgraded to a sealed bearing? Thanks.
Can Bearing 6903 handle 100 kg weight?
Yes or not
Hello, i was wondering, what tool did you use to remove the BB? can i know?
Here
www.lazada.com.ph/products/wbstar-bike-bottom-bracket-lock-ring-removal-repair-tool-multifunctional-wrenchs-300mm-i2067924606-s9196516599.html?exlaz=d_1:mm_150050845_51350205_2010350205::12:12598959962!121452561322!!!pla-297612067635!c!297612067635!9196516599!439944621&gclid=CjwKCAiA24SPBhB0EiwAjBgkhtrvwiRTf1HJmUNoYCMNlNRnzbKGOMGaCwBDm5R0AKSDNLhSCnqhUBoCYfYQAvD_BwE
Goods din ba iyan Sir sa 20rs ? Surplus Folding Bike ?
Hi. Was the chainline not at all affected by this conversion?
sir, is it necessary to change a crank arm in order to upgrade a sealed bearing bottom bracket?
You can still use your crank :)
Nag tagal naman po ba yan sir? Kasi sa nakita ko hindi fit yung bearing na nilagay mo kasi d mo na sya pinukpok papasok, ibig sabihin maluwag sa shafting yung bearing..pag ganun dahil mas matigas ang bearing kesa shafting mapupodpod po yung shafting.
Goods pa rin sir hanggang ngaun... 👌
Do all modern bikes now use sealed bearings?
Does it come with pedals?
is this really that much cheaper than buying something like a shimano un55 bb or something similiar?
Yes it's much cheaper but if you want to retain a vintage BB look, you can do it
Play daw muna kayo ni coggie 😁🥰
Chipakakulit! 😂
💯
🤗
What size bearing
Somewhat ok idea, terrible execution. You don't have enough thread engagement of the cups in the shell. This WILL lead to damaged threads on the frame. If you really are dead set on doing this conversion, go to ebay, your local used bike shop, or bike co-op and find a spindle with a similar overall length but shorter span between bearing races. Alternatively you could grind down both spindle bearing races and press fit a sealed bearing in their previous locations. The quickest, easiest, cheapest, and best option is to buy 11 new loose bearings for each side and pack them in a quality marine grease.
Pwede din ba iconvert to sealef nearing yung nasa head tube?
Yes
Sir ask ko lang po, kailangan po ba pantay yung crank na 1 by sa pinakamaliit na gear?
Kailangan po nasa gitna, kung naka square type BB kau, bumili kau nung pang fixie na bb size 103 para maiksi lang at hindi malaglag ung kadena
Ano po yung tawag sa tool na ginamit nyo sa 1:26 na pang baklas sa lock, san po nakakabli ng ganyan tool?
BB Remover tool po, pwede ka nmn gumamit ng adjustable wrench
Pwede!
Ano Po tawag sa bike na gamit nyo para Po Kasi women's bike na convert to road bike
mas maganda pa yata ang ganyang BB kaysa sa isa na square tapered din, mukha kasing di tutunog ang ganyang BB kahit biglahin mopa ang pagtipa, pero maliban sa BB ng hollow tech mas OK ba ang ganyang BB?
Sealed bearing din po ang hollowtech at mas syempre mas maganda :)
Compatible rin ba Siya Japan folding bike size 20er. Thanks!
Yes
Same size rin ng spacer Ang gagamitin ko for my folding bike?
pwede ba to sa vintage bikes na walang thread?
Saan mo po nabili yung bb remover mo? Ganyan pa kc bottom brocket ko e ,
Shopee lang sir
Ano po ba nilalagay pag walang thread ang bb shell bmx po???
Whats the size of ur bottom bracket and the spindle?
Anong sukat Ng tornilyo nyan lods Yung lock Ng crank? Newbie lang po
Yung sa vintage bike ko po malaki po bb nya ma coconvert po kaya sya sa sealed bearing?
Paanong malaki po? you mean mahaba?
@@CoggieBike yung pagkabilog po
Lods ano tawag dun sa digital na pinangsusukat mo? May shopee link ka lods?
Digital caliper po un sir... dami nyan sa shopee
@@CoggieBike salamat sa respond lods.
Pwede ba iconvert to sealed bearing yung cassette type hub? Pagawa ng vid
Ano po yung tawag dun sa tool po na pinangtanggal niyo po ng bottom bracket
BB Remover tool po
Same size po ba yan sa mga Japan bikes?
Genial así es mejor
¡Sí lo es!
mejor porque?
Sukat to sa ixf bb?
What is the size of the bearing
meron b pang hollow tech n bb?
probably cheaper to buy the entire sealed-cartridge bottom bracket assembly
Probably not, bearings are way cheaper plus you can do a DIY spacer or most of us has its own reserve spacer.
6903 2rs bearing is compatible to folding bike?..
Sa lahat po ng square time na lose bearings
4 spacer po ba kailangan?? Di po bayan aalog pag di mahigpit ang kapit ? 4 or 2?
Bottom bracket spacers size?
I believe all bb spacers are the same, coz threaded BB shells nowadays has the same sizes