I just came across this gem from the archives Matt, a highly informative video for the uninitiated regarding bearings. As an aircraft technician of 39 years I was taught that the difference between ball and roller bearings, at least in aerospace gas turbine (jet) engine applications, is that ball bearings can take some axial, or thrust load, whereas roller bearings are purely for rotational loads. I know that you , as an engineer, will know this, just wanted to add it as its an important distinction. Amazing that one of your oldest videos can impart so much knowledge in such a short time, good work.
Using this in 15 minutes with Saudi Aviation students here in sunny Riyadh - brilliant explanations - simple yet informative. Nice to hear a good Northern accent - reminds me of home!! Cheers
No, I'm absolutely serious, really. Your tutorials are both informative and accessible for second language speakers and are easily understood without being patronising or confusing - you have a rare talent. Your videos are used all over the world (I have colleagues who use them with Chinese students) and are a brilliant way to break up the monotony of technical theory lessons - believe me, your videos are the best of their genre on youtube - thank you!
I had no idea what a bearing was, and every search engine was telling me what it was used for. You put all the pieces together so eloquently, and that was a very thorough, applicable, and all around amazing! thx :)
Prior to seeing this video, I had seen a bunch of different things called "bearings" but I didn't know what function they had in common. I didn't know "bearing" was such a general category of things. Neat!
Excellent Teacher, Thankyou. I just started an apprenticeship @ 30 years old, in agricultural machinery and welding/fabricating, This really helped my understanding of bearings. You are awesome, The Way you cover every little detail, with just enough delay for the information to sink in. You more importantly answer the Why, which most other videos i've found don't do. You are making a difference, please keep doing what you do! :)
Thanks for the awesome comment dude, my dad is/was an agricultural engineer who worked for the likes of Renault and Massy Fergison. Dying sector in a waym, great to hear. - matt p.s just a quick question, where are you doing this apprenticeship?
Great video. I want to buy a Porsche and I have been warned about the IMS bearing problems that the car has. So this is my first lesson into bearings and I thank you for keeping it so simple that even an idiot like me can learn something!
Great and simple explanation and I got a lot from it, its the first time I know the piston ring is as a bearing ! Thanks a lot and looking forward to Episode 2
Extremely well done explanation and video, thank you for putting this out there, it was extremely useful to me. While playing with a fidget spinner (inexplicably popular spinning toy), I decided I needed to understand the purpose of a bearing. This video was perfect. Thanks again.
A Roman invention originally. Bearings also have a friction rating obtained by spinning the test bearing up to a set RPM and then timing how long it takes to spin down to a stop. When I used to drag race bikes, I used to rebuild engines with low friction rated (expensive) bearings to reduce internal frictional losses and increase acceleration. I also built one of my café racer engines with low friction rated bearing, back in the 1980's, and it improved the MPG and performance. When rebuilding an engine the result is only as good as the quality of bearings used. It's hopefully going to a long time before it comes apart again so best to do things properly. I was once called out to look at a Chinese made Chubb Knob Stair Lift (as the Chung Lan Star Way sc**ter is called around here) some kid had brought round a friend's house for help. I rode 11 miles and was asked to take a gander at the bearing on the rear transmission shaft..... IT WAS A NYLON BUSH!! It had done 3,000 miles and was already f**ked!! Anyway we packed it with grease, put it all together and placed an add in Exchange and Mart for him. He managed to sell it and bought a brand new Sachs Mad Ass.
What really fascinates me is how long some non-serviceable bearing like a clutch release or throw out bearing can last. You can not get into one in use or out of use to repack or replenish the grease. My Camry is 15 years old and has 150K miles and the OEM bearing is just starting to make noise. They are also lighter than ever before. 40 years ago I am sure this sort of thing was unheard of! Some of them have part of the housing made from plastics. It amazes me how seldom diaphragm springs on the clutch cover break as well given the number of cycles they see in real world use! When they do break the vehicle in question is has been through 3-5 owners or in use for 20 years etc....Not talking about race vehicles or heavily stressed off road vehicles or mining applications just your plane Jane daily driver sort of thing. We really take for granted the bearing and springs and such in our machinery!
Good video! I was looking for bearings and I found a British company that sells its own bearings that I didn't know at all. I'm curious about them. The brand of bearings is "showe", does anyone know or use them?
As i have reached the bottom, i have to leave a comment: Actually there are big quality differences between bearings. Especially on the lifetime-sealed bearings
Hi Matt , thanks a lot for this informative video ...I prefer reading stuff on my laptop - it is rather expensive to be on the net when I am not in the office- can you help in that area...like pdf downloads
have a custom build for some machinery and need some guide on bearing/s best suited. its fundamentally a hinge design, so i am not sure if a use a needle/ thrust and or standard bearing to manager friction. there is rotational (opening) but i assume there will be 'weight' - not sure wht is best for this type of application?
Hello mate, it depends where you need the bearing. If you have a picture or sketch then you can send me it through facebook here - facebook.com/pony.power.395
Thank you. Can you please help me? I'm looking for a bearing that will completely seal a plastic drum or a tank and allow rotation at the same time. I'm working on steering mechanism for a tank that will not allow any air or liquid gets out or inside the tank.
Yes mate you have two options. You can either used a 'sealed bearing' or use an oil seal after the bearing. If you give me more details then I can be more precise. I would need the application (load, rpm, OD, ID, thickness and what kind of 'seal' you want i.e oil, grease, liquid etc) Also do you want to pressurize behind the seal? - matt
Would love to know your opinion on ceramic bearings. They have a lot of benefits including increased strength and heat properties as well as reduced friction. I wonder if doing an entire gearbox and crank assembly would have noticeable benefits from standard bearings. A lot of them boast almost needing no oil...
"They have a lot of benefits including increased strength and heat properties as well as reduced friction." They last longer, that's it. And as for cranks, they have floating bearings. A ceramic varient would be worse, far worse.
Just pick up a bearing catalog from any of the Japanese brands like Koyo or NSK. They explain pretty well what heat ranges you need to use what clearance for and the RPM ranges each bearing model can handle, as well as the max loads
Hi Pony Power! We are trying to do some installations that move with the wind. We are working on vertical axis as well as horizontal axis pieces. Could you help us understand which bearings would work for us?
Why some engine crankshafts are on cylindrical roller bearings like maybach hl230 and some bike engines instead of using the regular journal type bearings with split shells and why arent they more common?
Cylindrical roller bearings require perfect alignment, if not they die dramatically. I did a video series on a bmw ge450 that does this way. She'll bearings are better, but require a more complex oil pressure system.
I'm just curious, if I swapped out for a manual transmission with an engine that never was designed to be paired with a manual... Will the thrust bearing hold up to the clutch being depressed? I've always wondered this xD never found an answer... I feel like the thrust bearing won't be as beefy so crank walk is likely
You won't find an answer because you're question isn't simple. The clutch CoF, spring rate, engine torque etc need to be known - once it is then you can work out the answer. This is a bit like 'how long is a piece of string'
The Workshop ohhh, ok, thank you! Awesome and very information video btw :) I'm just curious as to why you have a car emgine aluminum connecting rod xD I thought you just rebuilt bike engines
My apologies for commenting on an aged video, however I have an opinion question. Given your engineering background, what are your thoughts on using angular contact bearings for the mains in a 2 stroke, and/or dressing the shaft to “float” within the standard roller ball bearings?
The question that has to be asked is why? Why would you want tapered bearings vs balls? Another point is for tapered rollers you need to be able to apply pre-load to the bearings.
I wasn’t referring to a tapered roller, but rather an angular contact ball bearing. It seems to me, given the number of forces acting upon the crankshaft, that the combined effect would cause the crank to want to move in n axial direction, implying a thrust force upon the bearings. The angular contact, I believe, though rated slightly lower in perpendicular loading, would be well suited in the combination of thrust, and perpendicular. As the crank cheeks try to separate, wouldn’t the angular contact be better suited to react to these forces? The float, came from a mate that has done so, and his theory is that by allowing the crank to move a bit side to side prevents the thrust all together.
"As the crank cheeks try to separate, wouldn’t the angular contact be better suited to react to these forces?" as the crank tries to seperate - do you mean bend? If so then the crank bends within the bearing fixture points - nothing to do with the bearings but the stiffness of the crank and the forces applied to it. As for floating the crank does, its not fixed between the bearing inner races. And this doen't prevent thrusting - thrusting is a vector of force. Lastly - the bearings usually last longer than the the rings/cylinder. That's the major concern and not the bearings.
Typo there I think... the bending I refer to is the cheeks separating. In effect, yes a bending, however due to its design will the crankshaft not deform in a predictable, repetitive manor? If my assumption is correct, the outer ends will attempt to “rise” and the center “fall”. The deflection angle can, therefore be measured, and proper selection of angular bearing would counter that force, in that direction. It is not my intention to recreate the wheel, however in a competitive arena, one needs every little advantage they can find. I am just hoping to take advantage of any solution I can find.
This is really cool, don't the ball-housings though or cages cause friction among them though..? I mean, clearly they do their job regardless lol but this has always been something that's bugged me
Good question - bearings suffer from friction in the same way as 2 components would if no bearing was fitted. Bearings are used as they are sacrificial parts. The are designed with replacement in mind. If a crankshaft had no bearings and ran in the casing then when wear becomes too great you have to replace the casing and the crankshaft which would be extremely expensive compared to bearing replacement. To this end bearings can be designed to resist wear. This is usually done by constructing the besarings out of the same material so that the static and moving components wear at the same rate. Oil and low friction materials (like PTFE) can be used to reduce the wear. - hope this clears this up for you - matt
lol not really, this might help you - www.skf.com/binary/21-62749/RTB-1-05-Bearing-calculation.pdf One rule of thumb is that dynamic load is approximately twice the static load. - matt
No, flying saucers utilize a system of vacuums between the rotating center and the stationary shaft, which are kept separated by gravimagnetic forces. This means there is virtually no friction between the two pieces, and it is much more advanced than simple metal on metal rolling ball bearings. Hope this helped. :-)
Trying to repair this old window fan. I want to replace the bearings. How do I remove the things marked with green dots? I think I could use my digital calipers to find the diameter of the shaft and the outer part housing to find a replacement bearings. What tool can I buy or use to remove these? imgur.com/a/B9Xdh
I was just making sure before I gave you bad advice. You can do 2 things 1) - file/grind them will a dremel 2) - try to bend them back with a flat blade or a pick From the photos it looks like a ally or zinc casting so bend them back might not be possible. Once you replace the bearing the just stake it 3 times - 6 times is a bit excessive lol
I just came across this gem from the archives Matt, a highly informative video for the uninitiated regarding bearings. As an aircraft technician of 39 years I was taught that the difference between ball and roller bearings, at least in aerospace gas turbine (jet) engine applications, is that ball bearings can take some axial, or thrust load, whereas roller bearings are purely for rotational loads. I know that you , as an engineer, will know this, just wanted to add it as its an important distinction. Amazing that one of your oldest videos can impart so much knowledge in such a short time, good work.
Thank you from 7 years in the future 🙏🏻
Using this in 15 minutes with Saudi Aviation students here in sunny Riyadh - brilliant explanations - simple yet informative. Nice to hear a good Northern accent - reminds me of home!! Cheers
Sorry I didn't see this comment - are you pulling my leg?
No, I'm absolutely serious, really. Your tutorials are both informative and accessible for second language speakers and are easily understood without being patronising or confusing - you have a rare talent. Your videos are used all over the world (I have colleagues who use them with Chinese students) and are a brilliant way to break up the monotony of technical theory lessons - believe me, your videos are the best of their genre on youtube - thank you!
I had no idea what a bearing was, and every search engine was telling me what it was used for. You put all the pieces together so eloquently, and that was a very thorough, applicable, and all around amazing! thx :)
+Lauren Daley wow thanks for the great comment. I don't know what to say but thanks - matt
this gave me a clearer idea on bearings . explanation was so detailed .
Prior to seeing this video, I had seen a bunch of different things called "bearings" but I didn't know what function they had in common. I didn't know "bearing" was such a general category of things. Neat!
Thanks for taking your time out and explaining it in a very passionate way !!
Excellent Teacher, Thankyou. I just started an apprenticeship @ 30 years old, in agricultural machinery and welding/fabricating, This really helped my understanding of bearings. You are awesome, The Way you cover every little detail, with just enough delay for the information to sink in. You more importantly answer the Why, which most other videos i've found don't do. You are making a difference, please keep doing what you do! :)
Thanks for the awesome comment dude, my dad is/was an agricultural engineer who worked for the likes of Renault and Massy Fergison. Dying sector in a waym, great to hear. - matt
p.s just a quick question, where are you doing this apprenticeship?
Great video. I want to buy a Porsche and I have been warned about the IMS bearing problems that the car has.
So this is my first lesson into bearings and I thank you for keeping it so simple that even an idiot like me can learn something!
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A quick video made with little preparation, but useful and to the point. I recommend watching for those new to the subject of bearings.
It's a great video to get to know the basics of bearings quickly. Thanks for the amazing video!!
Thanks for the gracious comment dude - matt
Great and simple explanation and I got a lot from it, its the first time I know the piston ring is as a bearing !
Thanks a lot and looking forward to Episode 2
+Hussein Aljaza'ary
:) Also I wish if you put such this video for journal bearings
+Hussein Aljaza'ary cheers for the comment, yeah any disposable 'wearing' componant is considered a bearing. Thanks again
+Pony Power This will be also included. Trying to source shell bearings that have different type of layers to make it more interesting
Extremely well done explanation and video, thank you for putting this out there, it was extremely useful to me. While playing with a fidget spinner (inexplicably popular spinning toy), I decided I needed to understand the purpose of a bearing. This video was perfect. Thanks again.
Great video. You are so articulate on this subject. I learned a great deal. Subscribed.
Thank you for an informative explanation. Very helpful.
A Roman invention originally.
Bearings also have a friction rating obtained by spinning the test bearing up to a set RPM and then timing how long it takes to spin down to a stop.
When I used to drag race bikes, I used to rebuild engines with low friction rated (expensive) bearings to reduce internal frictional losses and increase acceleration.
I also built one of my café racer engines with low friction rated bearing, back in the 1980's, and it improved the MPG and performance.
When rebuilding an engine the result is only as good as the quality of bearings used. It's hopefully going to a long time before it comes apart again so best to do things properly.
I was once called out to look at a Chinese made Chubb Knob Stair Lift (as the Chung Lan Star Way sc**ter is called around here) some kid had brought round a friend's house for help. I rode 11 miles and was asked to take a gander at the bearing on the rear transmission shaft..... IT WAS A NYLON BUSH!! It had done 3,000 miles and was already f**ked!!
Anyway we packed it with grease, put it all together and placed an add in Exchange and Mart for him. He managed to sell it and bought a brand new Sachs Mad Ass.
Really useful information and super easy to understand!
Best videos! Thanks for the effort you put in!
thanks for the video man :) it was very easy to understand, I was having problems understanding the funtion of bearings
+Erick Aguilar Ramírez No worries mate, there will be some expansions on bearing coming up soon - matt
Learned a ton. Thank you so much.
Thanks for that.. awesome intro/summary to bearings
Thanks for that Bearing Breakdown 101 👍🏼
No worries mate thanks for the comment - matt
Pony Power yeah. muchas gracias, really good info
What really fascinates me is how long some non-serviceable bearing like a clutch release or throw out bearing can last. You can not get into one in use or out of use to repack or replenish the grease. My Camry is 15 years old and has 150K miles and the OEM bearing is just starting to make noise. They are also lighter than ever before. 40 years ago I am sure this sort of thing was unheard of! Some of them have part of the housing made from plastics. It amazes me how seldom diaphragm springs on the clutch cover break as well given the number of cycles they see in real world use! When they do break the vehicle in question is has been through 3-5 owners or in use for 20 years etc....Not talking about race vehicles or heavily stressed off road vehicles or mining applications just your plane Jane daily driver sort of thing. We really take for granted the bearing and springs and such in our machinery!
Great video my friend, thank you.
Great explanation! Thankyou for your time and efforts! :)
If you need to press a bearing into a hole always press on the writing side of the bearing. Needle roller type.
Good video!
I was looking for bearings and I found a British company that sells its own bearings that I didn't know at all. I'm curious about them. The brand of bearings is "showe", does anyone know or use them?
That big boy of a conrod is out of a top fuel dragster, isnt it?
I like your vids, greetz from germany :)
Yes it is
Informative video
As i have reached the bottom, i have to leave a comment:
Actually there are big quality differences between bearings. Especially on the lifetime-sealed bearings
correctly right, in the bearing market, we can find one bearing in many price, but we believe in we got what we paid. 水太深了
Hi Matt , thanks a lot for this informative video ...I prefer reading stuff on my laptop - it is rather expensive to be on the net when I am not in the office- can you help in that area...like pdf downloads
Amazing. Many thanks boss!
have a custom build for some machinery and need some guide on bearing/s best suited.
its fundamentally a hinge design, so i am not sure if a use a needle/ thrust and or standard bearing to manager friction. there is rotational (opening) but i assume there will be 'weight' - not sure wht is best for this type of application?
Hello mate, it depends where you need the bearing. If you have a picture or sketch then you can send me it through facebook here - facebook.com/pony.power.395
Thank you.
Can you please help me?
I'm looking for a bearing that will completely seal a plastic drum or a tank and allow rotation at the same time.
I'm working on steering mechanism for a tank that will not allow any air or liquid gets out or inside the tank.
Yes mate you have two options. You can either used a 'sealed bearing' or use an oil seal after the bearing. If you give me more details then I can be more precise. I would need the application (load, rpm, OD, ID, thickness and what kind of 'seal' you want i.e oil, grease, liquid etc) Also do you want to pressurize behind the seal? - matt
thanks for the video. very clear and simple explanation that my IQ can handle. :)
+marv medina No worries mate happy I could help you out - matt
Would love to know your opinion on ceramic bearings. They have a lot of benefits including increased strength and heat properties as well as reduced friction. I wonder if doing an entire gearbox and crank assembly would have noticeable benefits from standard bearings. A lot of them boast almost needing no oil...
"They have a lot of benefits including increased strength and heat properties as well as reduced friction."
They last longer, that's it. And as for cranks, they have floating bearings. A ceramic varient would be worse, far worse.
Could you make a video about clearances ,Rpm range and temperatures ?I really would like to know more about that.
Just pick up a bearing catalog from any of the Japanese brands like Koyo or NSK. They explain pretty well what heat ranges you need to use what clearance for and the RPM ranges each bearing model can handle, as well as the max loads
Well... it's not that simple.
Hi Pony Power! We are trying to do some installations that move with the wind. We are working on vertical axis as well as horizontal axis pieces. Could you help us understand which bearings would work for us?
double tapered roller bearings
Keep the video short. Straight to the point. This video can be done in less than 10 minutes
I don't need to say this but this was my first video...
Why some engine crankshafts are on cylindrical roller bearings like maybach hl230 and some bike engines instead of using the regular journal type bearings with split shells and why arent they more common?
Cylindrical roller bearings require perfect alignment, if not they die dramatically. I did a video series on a bmw ge450 that does this way.
She'll bearings are better, but require a more complex oil pressure system.
@@dirtygarageguy I see now , thanks a lot.
I'm just curious, if I swapped out for a manual transmission with an engine that never was designed to be paired with a manual... Will the thrust bearing hold up to the clutch being depressed? I've always wondered this xD never found an answer... I feel like the thrust bearing won't be as beefy so crank walk is likely
You won't find an answer because you're question isn't simple. The clutch CoF, spring rate, engine torque etc need to be known - once it is then you can work out the answer.
This is a bit like 'how long is a piece of string'
The Workshop ohhh, ok, thank you! Awesome and very information video btw :) I'm just curious as to why you have a car emgine aluminum connecting rod xD I thought you just rebuilt bike engines
thank u bro! a great video.i appreciate the help :)
You did a Piaggio :D That package
where is episode 2?
My apologies for commenting on an aged video, however I have an opinion question. Given your engineering background, what are your thoughts on using angular contact bearings for the mains in a 2 stroke, and/or dressing the shaft to “float” within the standard roller ball bearings?
The question that has to be asked is why? Why would you want tapered bearings vs balls?
Another point is for tapered rollers you need to be able to apply pre-load to the bearings.
And what do you mean 'float' - you mean so the shaft is undersized?
I wasn’t referring to a tapered roller, but rather an angular contact ball bearing. It seems to me, given the number of forces acting upon the crankshaft, that the combined effect would cause the crank to want to move in n axial direction, implying a thrust force upon the bearings. The angular contact, I believe, though rated slightly lower in perpendicular loading, would be well suited in the combination of thrust, and perpendicular. As the crank cheeks try to separate, wouldn’t the angular contact be better suited to react to these forces?
The float, came from a mate that has done so, and his theory is that by allowing the crank to move a bit side to side prevents the thrust all together.
"As the crank cheeks try to separate, wouldn’t the angular contact be better suited to react to these forces?"
as the crank tries to seperate - do you mean bend? If so then the crank bends within the bearing fixture points - nothing to do with the bearings but the stiffness of the crank and the forces applied to it.
As for floating the crank does, its not fixed between the bearing inner races. And this doen't prevent thrusting - thrusting is a vector of force.
Lastly - the bearings usually last longer than the the rings/cylinder. That's the major concern and not the bearings.
Typo there I think... the bending I refer to is the cheeks separating. In effect, yes a bending, however due to its design will the crankshaft not deform in a predictable, repetitive manor? If my assumption is correct, the outer ends will attempt to “rise” and the center “fall”. The deflection angle can, therefore be measured, and proper selection of angular bearing would counter that force, in that direction.
It is not my intention to recreate the wheel, however in a competitive arena, one needs every little advantage they can find. I am just hoping to take advantage of any solution I can find.
Very nice explanation.Thanks for your effort. The clarity of the video is very good. Which camera did you use ? Looking forward to Episode 2. :-)
+TarunKumar Goel Thanks for the comment dude, the camera is a sony cx190
+Pony Power Thanks for your reply. The sony cx190 is doing a good job. Very nice HD quality video. -:)
thanks man learnt a lot
+lkj2727 No worries mate - happy to help
Do rear wheels have bearings too?
This is really cool, don't the ball-housings though or cages cause friction among them though..? I mean, clearly they do their job regardless lol but this has always been something that's bugged me
Good question - bearings suffer from friction in the same way as 2 components would if no bearing was fitted. Bearings are used as they are sacrificial parts. The are designed with replacement in mind. If a crankshaft had no bearings and ran in the casing then when wear becomes too great you have to replace the casing and the crankshaft which would be extremely expensive compared to bearing replacement. To this end bearings can be designed to resist wear. This is usually done by constructing the besarings out of the same material so that the static and moving components wear at the same rate. Oil and low friction materials (like PTFE) can be used to reduce the wear. - hope this clears this up for you - matt
Ah I see, so I guess they're "bearing" the burden lol. Thanks for the video and the response though that really helps!
amazing explanation.. thanks
No worries mate thanks for the comment - matt
amazing dude
Brilliant. Thanks!
Is there any thumb rule to calculate axial load of bearing?
lol not really, this might help you - www.skf.com/binary/21-62749/RTB-1-05-Bearing-calculation.pdf
One rule of thumb is that dynamic load is approximately twice the static load. - matt
Hi Mark. Do flying saucers contain bearings?
No, flying saucers utilize a system of vacuums between the rotating center and the stationary shaft, which are kept separated by gravimagnetic forces. This means there is virtually no friction between the two pieces, and it is much more advanced than simple metal on metal rolling ball bearings.
Hope this helped. :-)
The best quality bearings are alloy magnetic with electro magnetic bearing. 100% frictionless.
Christs Revenge Depends on application.
Scientifically impossible.
@@stephenburns5237 you might want to do a bit of research before commenting that it's impossible. They are commercially available.
Trying to repair this old window fan. I want to replace the bearings. How do I remove the things marked with green dots? I think I could use my digital calipers to find the diameter of the shaft and the outer part housing to find a replacement bearings. What tool can I buy or use to remove these? imgur.com/a/B9Xdh
Isn't that the outer race? Can you get a picture of the bearing from the side please?
Gonna take some time, my connection is VERY slow.
These.. it's like folded over metal that prevents the bearing from coming out. i.imgur.com/gSwBpBC.jpg
I'll finish uploading the rest.
I think this is pretty clear too. i.imgur.com/gG7JUW7.jpg
I was just making sure before I gave you bad advice. You can do 2 things
1) - file/grind them will a dremel
2) - try to bend them back with a flat blade or a pick
From the photos it looks like a ally or zinc casting so bend them back might not be possible. Once you replace the bearing the just stake it 3 times - 6 times is a bit excessive lol
I noticed you struggling for words to explain things there, ..... PREPARATION IS THE KEY THERE, OK?
Nonetheless, ... good video as usual.
LOL this video is literally 6 years ago, it was also my very first video - we can't all be perfect
in my research my means and logic uses, the cylindrical bearings comes first not the spherical ones
even the strength of surface contacts, diameter and surface area
Comes first?
Thanks for the fidget spinner
Thanks bro. ......
mutta bonda no worries mate - matt
it's a madness
Kent!
hot
last
for me it's a piece of shit
for you?
lol............yeah
never buy n t n bearings poor quality