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Wheel Bearings
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bantam 1050
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November 4, 2011 - 11:20 am
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B175 wheel bearings
Hi, just wondering should i fit normal 6202 / 6203 or C3 bearings.
On stripping the old front hub the fitted bearings were marked with a C3.
Any ideas.
Thank you.
Ross

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mikef
Chatham Kent
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November 4, 2011 - 9:14 pm
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Hi.
I have to admit to not knowing much about bearing data. Doing a little research have found that C3 refers to the clearance, allowing for heat expansion.
Bearings that operate in hot conditions will require a higher C number. Bantam wheel bearings will not get very hot I think. The other numbers seem to refer to bearing size.
I have no idea what the standard bearings would have been, hopefully someone else will know.
All the best.
Mike.

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Keith
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November 5, 2011 - 3:07 am
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The following paragraph regards C3 bearings, comes from a very respected and knowledgable.member over on the BSA M20 forum. This was in response to a question regarding the drive side bearings on the BSA M20 500cc engines.
Thanks Keith

----------------------------------------------------------------
The C3 fit indicates a (very slightly) larger internal clearance. This was to make allowance for the pressure applied to the outer bearing by the crankcase. C3 fit bearings are harder to find and considerably more expensive. I believe the majority of crankcases have now lost some 'fit' from the main bearing housings as a consequence of bearing replacement over the years (particularly if they have not been heated prior to bearing removal and replacement). The internal bearing clearance differs by only a few microns and I have found that standard fit bearings run without any perceptible problems, and it is even more difficult to get the Imperial bearings in a C3 fit. ----------------------------------------------------------------

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Cornish Rooster
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November 5, 2011 - 7:30 am
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Bearings are something that I deal with quite a bit in my job and we usually fit C3 type bearings for more heavy service applications where there is more vibration for example, they do have some more internal clearance as I understand it. For a duty such as wheel bearings where actually there is a reasonably light loading for the size of the bearing a "standard" type should be fine. More importantly as I see it is to fit shielded bearings (sealed), either metal or rubber, for example 2RS means sealed both sides with rubber type seal, I have been using sealed bearings for wheel bearings for years and they last a lot longer, one of the reasons wheel bearings fail is dirt in the races, with a sealed bearing that problem is eliminated and you don't have the routine greasing to do either.

Phil

BSA Bantam D1 "150" in use regularly often as general purpose transport, quite a few other bikes as well. Cornwall Area Rep. 

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Cornish Rooster
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November 5, 2011 - 7:50 am
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One, more thing 6203 and 6202 etc are actually metric sized bearings, strange as it seems often even old Brit stuff has metric sized bearings, I find the cheapest place to get bearings ( and quicker) is to use one of my local bearing suppliers, they have just about everything on the shelf, same applies to seals etc. There is sure to be a place near you no matter where you live, check the Yellow Pages or on-line.

Phil

BSA Bantam D1 "150" in use regularly often as general purpose transport, quite a few other bikes as well. Cornwall Area Rep. 

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Doug Brown
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November 5, 2011 - 12:52 pm
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Just take your old bearings along to your nearest Eriks.They deal with the trade and have all the cross referencing charts.I think the originals were made by Hoffman.All you need is the outer ring of the bearing with the number on.Do NOT use chinese they are a waste of money!Most bantams have three of one type and one of another. ** Please log in to view **

Triumph Thunderbird 900 Yamaha rxs 100 and too many bantams !

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bantam 1050
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November 5, 2011 - 7:25 pm
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Cheers guys for the info.
Ross

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DoubleDiamond
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November 6, 2011 - 5:18 pm
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My B175 parts book does not list the bearings as C3 clearance. I suspect that for this particular application it makes very little difference if any. I'm sure that for normal use either standard or C3 will be just fine.

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