Topic: Can anyone identify this...

[joe750]

Okay this might be a shot in the dark but here it goes
does anyone recognize this hub or what its off of?

came with a bobber i bought.

but when the backing plate from a known 750 is put in, it doesnt fit in the "lip" and rotate freely once the axle nut is tightened.

instead it "butts up", if you will, to the edge of the hub.
and when the axle nut is tightened it stops the wheel from spinning freely.

obviously the backing plate is wrong.
and the edge of the hub and the groove inside is slightly different.

i guess the question is...
could this be a 500 hub?
is there a difference in the hub on the 750 and 500?

the axle size is the same as a 750 and the sprocket fits fine.

i'd really like to be able to use this thing but as of now its a paper weight.

thanks

[754]

Looks like an early 750 hub. If you are selling I call dibs can trade for correct one. If your Inner spacer is not in place, it will fit like you said it did.

[Dream750]

Not sure what hub you have, but this is what my ‘69 750K two-hole hub looks like. Note the difference in the machined step of the outer lip.

[754]

 I see the lip difference now, different hub that first one & not the one I am looking for.

[joe750]

thanks for the help guys.
I guess I'll keep searching.

is there any other bikes that share the same axle as the cb750 ?

what size is the axle anyways?

[754]

19mm. Dohc.  750 has a different backing plate might be one of them hubs..

[Dream750]

thanks for the help guys.
I guess I'll keep searching.

is there any other bikes that share the same axle as the cb750 ?

what size is the axle anyways?

The CB750 K rear axle by part number is: 42301-300-010 which shares the same part number with the other models shown below as per the cross reference.
 
CB500     A MOTORCYCLE, JPN, VIN# CB500-1000001
CB500K1 A MOTORCYCLE, JPN, VIN# CB500-2000001
CB500K2 A MOTORCYCLE, JPN, VIN# CB500-2100001
CB550     A MOTORCYCLE, JPN, VIN# CB550K-1000001
CB550F   A MOTORCYCLE, JPN, VIN# CB550F-1109886
CB550F   A (76) MOTORCYCLE, JPN, VIN# CB550F-2000003
CB550K   A (76) MOTORCYCLE, JPN, VIN# CB550K-1230001
CB550K1 A MOTORCYCLE, JPN, VIN# CB550K-1200001
CB750K0 A MOTORCYCLE, JPN, VIN# CB750-1000001
CB750K1 A MOTORCYCLE, JPN, VIN# CB750-1044650
CB750K2 A MOTORCYCLE, JPN, VIN# CB750-2000001
CB750K3 A MOTORCYCLE, JPN, VIN# CB750-2200001
CB750K4 A MOTORCYCLE, JPN, VIN# CB750-2300001
CB750K5 A MOTORCYCLE, JPN, VIN# CB750-2500001
CB750K6 A MOTORCYCLE, JPN, VIN# CB750-2540001