tegwin
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| posted on 17/7/07 at 10:31 AM |
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Another bearing question...quality...
If I order a 61900 2RS bearing from an industrial bearing specialist they charge £2.80 plus VAT per bearing...
If I order the same bearing code from a bike supplier they charge £7 per bearing...
Is it likley that given they have the same code, the bearings will be identicall...or are the more expensive bearings going to be a better quality?
(they are small deep groove roller bearings with rubber seals if it makes and difference)
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nick205
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| posted on 17/7/07 at 10:47 AM |
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The identification number should mean they are the same part. If you buy from the bearing supplier you're avoiding the bike manufacturer and
bike shop's mark-up on the real price of the bearing.
I had the same experience when replacing the sealed cartridge bearings in my pedals ~£3 a pair from BSL or ~£10 pair from a local bike shop.
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GazzaP
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| posted on 17/7/07 at 10:51 AM |
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Hi
I work for Brammer ( old bsl ) basically the mark up on the bearings from the bike dealer is massive. Go to a bearing stockist like brammer and they
will be a better quality bearing and alot cheaper.
hope this helps
Gary
www.gmpmotorsport.co.uk
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tegwin
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| posted on 17/7/07 at 11:05 AM |
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Chears...Thats good to know... Looks like im going up to B-Ham to pick up some nice cheap bearings
When I am seating new bearings into ali housings, should I fit copperslip, or liquid gasket or something between the casting and the bearing housing?
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nick205
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| posted on 17/7/07 at 11:32 AM |
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a small smear of normal grease will help the bearings go in, but that should be all you need.
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tegwin
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| posted on 17/7/07 at 02:23 PM |
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2.5 hour round trip and I now have 10 little bearings sat infront of me...
Now begins the task of dismantling the swinagrm and putting all the bearings in
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DarrenW
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| posted on 17/7/07 at 09:04 PM |
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The numbers you quote relate to the basic size of the bearing, 2RS being 2 rubber seals. It is very possible that bearings from different sources
could be to very different quality levels. As an example the process and controls in place for automotive OE quality are far far higher than for
aftermarket quality bearings.
Yes the markup will play a part and make it hard to decide but there are a lot of differences between the various manufacturers.
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tegwin
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| posted on 17/7/07 at 09:06 PM |
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Interestingly enough, the new bearings I have are made by exactly the same company that made the origionals....I only just noticed that they have the
same manufacturors stamp on them...
Only managed to fit four of the new bearings in the end....the four smaller ones sont come out of the frame....think I need to make a puller...and the
two larger ones are the wrong size...but luckily the ones with the most play in them have been replaced
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nick205
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| posted on 20/8/07 at 03:06 PM |
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NSK by any chance?
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DarrenW
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| posted on 20/8/07 at 03:55 PM |
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Hopefully they will be NSK / FAG / SKF / QC / NTN / Timken etc.
Even the better known makes buy rings etc from far east but they insist on good process control before buying so you will be fine. Im sure most
manufacturers do OE and Aftermarket quality bearings. I could bore you with the details but for most of our applications the aftermarket quality will
be OK.
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andyps
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| posted on 21/8/07 at 01:11 PM |
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quote:
Originally posted by DarrenW
Hopefully they will be NSK / FAG / SKF / QC / NTN / Timken etc.
Even the better known makes buy rings etc from far east but they insist on good process control before buying so you will be fine. Im sure most
manufacturers do OE and Aftermarket quality bearings. I could bore you with the details but for most of our applications the aftermarket quality will
be OK.
Unless things have changed since I was there, that is certainly not the case with Timken, and almost certainly not with the other reputable
manufacturers. The aftermarket volumes are pretty small compared with OE when talking about sales to the distributors such as Brammer/BSL and the cost
of making something different would mean they would not actually be cheaper due to volumes.
Andy
An expert is someone who knows more and more about less and less
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DarrenW
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| posted on 21/8/07 at 01:23 PM |
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That is certainly true of the main runners (ie main part numbers / models) that run and run for years in high volume. Some of the aftermarket
production may still be on the auto equipment but to keep cost down they can relax the tolerancing on the ring grinding and ball matching etc. Still
excellent quality and not many would know the difference but it helps to reduce the scrap rate at end of line. Its also possible that the final noise
test limits can be relaxed to increase throughput. Again this would not be detectable to most users. It is the main OEM's that enforce strict
process control, and in the main they will have their own specs and part numbers so as to differentiate the products rather than the better known
numbering system that we would use.
There is also a different std in use for motor quality bearings. I have been involved in development projects for TRW and others on their electric
steering systems where they spend 000's on NVH testing before signing off a process for their bearing designs. This all adds to the final cost
of each unit.To the naked eye these bearings will appear identical to the std bearing type but believe me they are made to far greater tolerances.
I have done a study on the rejects from a line making bearings to these stds and they are often better than the normal grade bearings.
[Edited on 21/8/07 by DarrenW]
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andyps
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| posted on 21/8/07 at 05:16 PM |
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Timken never even changed the tolerances - the only difference with aftermarket bearings was that they went into individual boxes rahter than bulk
pack before being despatched to customers. There were times when due to shortages OE customers were supplied from aftermarket stock so having a
different standard for that would have made that impossible.
Andy
An expert is someone who knows more and more about less and less
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