thats a good question...
On my 72 cb350, I know for a fact that the fattest tires you could run on stock rims w/o issues is a 120.
I would guess it would be the same for a cb450..
I asked this same question on the CB450 board a few weeks ago.
The average answer I got was a 120, but a few people said they were able to stuff
130's in the stock swingarms.
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