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Author Topic: Rear wheel bearing size  (Read 703 times)

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Offline 77379

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Rear wheel bearing size
« on: June 29, 2018, 01:30:29 PM »
I removed the rear wheel bearings from my 1969 CB750 hub and ordered a new set of All Balls 6304 bearings which is the size recommended on their website and other websites. The problem is, the ones that came out of the hub were quite a bit smaller. I’m looking for the correct size for the 1969 rear hub. The new 6304 bearings did fit perfectly into a K1 hub so I used them there. I took a picture of the K1 hub with the new bearings in it with the bearing that came out of the 1969 laying on top of it to show the difference in size. Any idea what size bearings I should use?
Thanks
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Offline Yamahawk

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Re: Rear wheel bearing size
« Reply #1 on: June 29, 2018, 07:49:37 PM »
If you have a bearing supply house local, just take it in. Here in Toledo, G & J bearings are on Lewis Ave and is a family owned business. They will measure it, and give you a way better bearing than All Balls has. It will cost you twice as much, also. But its worth it!
Charlie
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1971 CB750K1 (newest bike), 1996 Royal Enfield 500 Bullet (therapy bike), 1981 Yamaha XV920RH, 2006 Kawasaki Concours (retirement bike), 1975 Yamaha RD350 (race bike), 1989 Honda VTR250 Interceptor (race bike), 1986 Kawasaki EX250 Ninja (race bike in progress), 1985 Honda Elite CH250, 1973 Yamaha GT1 80cc, 1974 Yamaha DT360 project bike.

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Offline Bodi

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Re: Rear wheel bearing size
« Reply #2 on: June 30, 2018, 06:11:30 AM »
Pretty much every bearing made has the part number etched/punched/engraved on the side. The number is probably a 6400 series (6404, 6405... whatevs), and any bearing shop will sell you an excellent replacement. All Balls bearings have no magic, they use the same quality as you find at Harbor Freight. A "name brand" bearing like FAG or NTN will cost maybe a bit more.
If you don't have the original, measure the outer bore, shaft, and thickness (depth of the outer bore for the bearing)... check a 6400 series spec sheet and the right one will be obvious.
Get double sealed bearings, not the single shield ones Honda used. Yes, you get a tiny bit more friction... but the grease stays inside so they will last the rest of your life and beyond.
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