NORTSTER1974
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https://www.nocnsw.org.au/technical/commando-bearings No machining required if you find the right bearing. Search and search again. Just look at the dimensions, they are in the service manual.
The PO of my bike said that it still had the original wheel bearings when I purchased it. That makes me feel like I should change them out on 50 year old bike, since I do plan on going on some long rides, but then again it only has about 17,000 miles...I mentioned 123bearing.com They stock several brands of 4203-2RS and ship very quickly. One they call "generic" and they also have SKF, NSK, and others. 4203-2RS are very hard to find in the US, except for the 123bearing.com web site and the PGN website I also mentioned.
So, not as easy as some bearings to find, but not hard to find either. You can even buy many FAG, SKF, PGN bearings on Amazon and today name brand 4203 are available from several sellers there, but no 4203-2RS
Don Pender and I also sell them (generic).
Wash 'em out, inspect, if ok, re-pack & enjoyThe PO of my bike said that it still had the original wheel bearings when I purchased it. That makes me feel like I should change them out on 50 year old bike, since I do plan on going on some long rides, but then again it only has about 17,000 miles...
if I do change them out, would the 4203-2RS be the right bearing for my MK III disc brake rear wheel also?
Doing one quick google search, I am only seeing the choice of Generic or Zen brand anywhere. If you sell Generic, you must have some faith in them... any insight? I have never heard of Zen, but at least it is a brand name... for a few dollars more X 4 + shipping.
if I do change them out, would the 4203-2RS be the right bearing for my MK III disc brake rear wheel also?
Oops, I forgot about the hub bearings!For the Mk3 sprocket bearing, yes.
The Mk3 rear hub bearings are 6203 and 6204.
Andover Norton Parts Drawings - Genuine Andover Norton Factory Parts - Commando Parts
Andover Norton Parts are the only Norton spare parts in the market manufactured to original drawings, within the factory-approved tolerances, from the correct materials, and with the correct finish.andover-norton.co.uk
Oops, I forgot about the hub bearings! Thanks for the reminder, L.A.B.For the Mk3 sprocket bearing, yes.
The Mk3 rear hub bearings are 6203 and 6204.
Andover Norton Parts Drawings - Genuine Andover Norton Factory Parts - Commando Parts
Andover Norton Parts are the only Norton spare parts in the market manufactured to original drawings, within the factory-approved tolerances, from the correct materials, and with the correct finish.andover-norton.co.uk
6203 is 17 x 40 x 12mm.1 6203 06-5542 17mm x 40mm x 16 AN sells them as -2RS Hub
1 6204 06-5541 17mm x 40mm x 16 AN sells them as -2RS Hub
Oops - typos are what I do best! Post Edited.
1 6204 06-5541 17mm x 40mm x 14 AN sells them as -2RS Hub (Edited)
They know their stuff, don’t they!the value of what I am learning on the Access Norton Forum far exceeds the membership fee. Not to mention cost savings from inside knowledge
OK, got rid of it.It's still wrong.
6204 is 20 x 47 x 14.
Andover Norton - BEARING 6204 20 x 47 x 14mm (Two seals) - 06.5541
BEARING 6204 20 x 47 x 14mm (Two seals)andover-norton.co.uk
Not sealed. There are plenty of name brand, not sealed, way less expensive available. For instance, Amazon has SKF and FAG.This one, sold by a US supplier mentions Austria manufacture.
Norton Commando Double Row NM17721 Wheel Bearing 4203 c3 06-7688 Austria | eBay
If you would like the less expensive Indian Made alternative we carry that as well.www.ebay.com